Sash windows

The Importance of Choosing Conservation-Friendly Woon Windows
29 Nov

The Importance of Choosing Conservation-Friendly Woon Windows

For many homeowners in London, preserving the style and heritage of their property is just as important as improving comfort and efficiency. This is especially true for those living in conservation areas or period homes, where the choice of windows can significantly impact both the appearance and value of the property. Choosing conservation-friendly wooden windows is one of the best ways to maintain architectural integrity while benefiting from modern craftsmanship and performance. Here™s why they matter.

Preserving Authentic Character and Period Detail

Original sash and casement windows were designed to complement the proportions, materials and craftsmanship of historic properties. Conservation-friendly wooden windows replicate these traditional styles with precision, ensuring your home retains its original charm. Mortice & Green specialise in manufacturing bespoke hardwood windows that match the exact period features, profiles and joinery of older frames. This attention to detail protects the visual harmony of the building and keeps your home aligned with conservation regulations.

Meeting Conservation and Planning Requirements

Homes within conservation areas or listed buildings often have strict guidelines regarding what can be altered. Choosing conservation-friendly wooden windows ensures compliance with local authorities and avoids the risk of rejected planning applications. Wooden windows are the preferred choice in most cases because they maintain the historic aesthetic, use natural materials and can be crafted to match the original design exactly. Mortice & Green™s bespoke options allow homeowners to meet these requirements while still upgrading to more efficient, better-performing windows.

Superior Repairability and Longevity

One of the greatest advantages of wooden windows is their ability to be repaired and restored rather than replaced. Unlike PVC or aluminium, timber can be refurbished multiple times over its lifetime, making it far more sustainable. With expert care, hardwood windows can last for decades, even centuries. Mortice & Green™s experienced restorative joiners can repair sash cords, fix rot, refurbish frames and restore sliding mechanisms, giving original windows a new lease of life while maintaining historic authenticity.

Improved Energy Efficiency Without Losing Heritage

Many homeowners assume traditional windows can™t be energy efficient, but conservation-friendly wooden windows can be upgraded in discreet and effective ways. Options such as draught proofing, new pulley systems and double glazing fitted into existing sashes dramatically improve heat retention without altering the appearance. Mortice & Green provide double-glazed units designed specifically to blend seamlessly with original frames, meaning you can enjoy a warmer home while still honouring the property™s heritage.

Protecting History While Enhancing Your Home

Choosing conservation-friendly wooden windows is more than an aesthetic decision, it™s a commitment to preserving craftsmanship, protecting architectural history and ensuring your home remains both functional and beautiful for generations. With bespoke design, skilled restoration and the use of durable hardwood, Mortice & Green help homeowners achieve the perfect balance between tradition and modern performance. If you’re considering window repairs or replacements for a period property, contact Mortice & Green for expert guidance and personalised conservation-friendly solutions.

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Hardwood vs Softwood Choosing the Right Material for Replacement Sash Windows
17 Jul

Hardwood vs Softwood: Choosing the Right Material for Replacement Sash Windows

When it comes to replacing your sash windows, one of the first and most important decisions you™ll face is which timber to choose: hardwood or softwood. While both materials are commonly used in sash window manufacture, they offer different advantages in terms of durability, finish, and long-term performance.

At Mortice & Green, we™ve been restoring and crafting bespoke hardwood sash windows in London since 1994. Whether you live in a period property in a conservation area or simply want to upgrade your draughty sash windows, understanding the differences between hardwood and softwood is essential for making the right choice.

What™s the Difference?

The terms “hardwood” and “softwood” refer to the type of tree the timber comes from, not necessarily the density of the wood. Generally speaking, hardwoods come from slow-growing deciduous trees, while softwoods come from faster-growing coniferous trees. This has a significant impact on cost, strength, and longevity.

Hardwood Sash Windows: Strength, Longevity, and Superior Finish

Hardwood (such as oak, sapele, or iroko) is renowned for its natural strength and resistance to rot, making it an ideal material for long-lasting, high-quality sash windows.

Key Benefits:

  • Durability: Hardwood is denser and more resistant to wear, making it better suited to London™s changing climate and pollution levels.
  • Low Maintenance: Thanks to its inherent strength, hardwood requires less frequent repainting or repair.
  • Aesthetic Appeal: It provides a smoother, richer grain that takes stain or paint extremely well, offering a premium finish.
  • Long-Term Value: Though the initial investment is higher, hardwood windows often last 50 years or more with proper care.

At Mortice & Green, we specialise in replacement hardwood sash windows, hand-built to match the exact dimensions and style of your originals, perfect for period homes and conservation areas.

Softwood Sash Windows: Affordable and Functional

Softwood (commonly pine or redwood) is more affordable and easier to work with, making it a practical option for homeowners on a budget or for properties where longevity isn™t the top priority.

Key Advantages:

  • Cost-Effective: Typically cheaper than hardwood, softwood is a more budget-friendly option upfront.
  • Workability: Softwood is easier to shape and cut, allowing for faster manufacturing and installation.
  • Lightweight: This can be an advantage in some retrofit projects, particularly where the frame structure is less robust.

However, softwood is more vulnerable to moisture, warping, and decay over time, especially in exposed locations. It also requires more regular maintenance, including repainting and treating, to extend its lifespan.

Which Is Right for Your Home?

  • If you own a listed or heritage property in London, or if you™re looking for a long-term investment that respects architectural integrity, hardwood is the superior choice.
  • If your priority is a cost-conscious solution for a secondary space or a short-term project, softwood may be worth considering, but expect more upkeep.

At Mortice & Green, we believe that sash windows should be built to last. That™s why we manufacture our replacement sash windows from premium hardwood, offering strength, stability, and timeless elegance that complements the original character of London™s period homes.

Get Expert Advice from Mortice & Green

Still unsure which timber is right for your sash window replacement? Our experienced joiners are happy to advise based on your property type, location, and long-term goals. We™ll provide an honest, straightforward recommendation, and a quote based on what your home truly needs, not what™s most profitable. Contact Mortice & Green today for expert advice on sash window replacement, renovation, or repair across London.

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Why Draught Proofing Your Sash Windows Can Cut Energy Bills
24 Feb

Why Draught Proofing Your Sash Windows Can Cut Energy Bills

Sash windows are a bespoke feature in many London homes, known for their classic design and historical charm. However, while they add significant aesthetic value, traditional sash windows can often be a major source of draughts, leading to unnecessary heat loss and inflated energy bills. Fortunately, there™s a simple, cost-effective solution that doesn™t require replacing your beloved windows, draught proofing.

At Mortice & Green, we specialise in sash window repair, refurbishment, and draught proofing. Our goal is to help homeowners preserve the elegance of their original sash windows while improving their energy efficiency. Let™s explore how draught proofing your sash windows can dramatically reduce heat loss, enhance comfort, and cut down on energy bills.

1. Understanding the Impact of Draughty Sash Windows

Traditional sash windows, especially those found in period properties, were designed long before modern insulation standards. Over time, gaps between the sashes, frames, and parting beads can widen due to wear and natural wood movement, leading to draughts. Even the smallest gaps can allow cold air to seep in and warm air to escape, forcing your heating system to work harder to maintain a comfortable temperature.

According to the Energy Saving Trust, up to 20% of a home™s heat can be lost through draughty windows and doors. In a city like London, where heating costs can be high during colder months, this kind of energy loss can significantly inflate utility bills.

2. How Draught Proofing Works

Draught proofing involves sealing the gaps and openings around your sash windows while still allowing them to function properly. At Mortice & Green, we install discreet brush pile seals within the parting and staff beads that frame the sashes. These seals create an effective barrier against cold air and prevent heat from escaping.

The beauty of draught proofing is that it™s minimally invasive. It doesn™t alter the appearance of your windows and can be completed without replacing the original frames or sashes, perfect for conservation areas and listed buildings where maintaining historical integrity is essential.

3. The Energy-Saving Benefits of Draught Proofing

1. Reduced Heat Loss
Draught-proofing eliminates the gaps that let warm air escape and cold air enter, making your home easier and cheaper to heat. With better insulation, your heating system doesn™t have to work as hard, leading to noticeable savings on your energy bills.

2. Lower Energy Consumption
By reducing the workload on your heating system, you also reduce your home™s overall energy consumption. In today™s environmentally conscious world, this is a great way to lower your carbon footprint without making drastic changes to your home.

3. Improved Thermal Comfort
Draught-proofing creates a more stable indoor temperature, eliminating cold spots and uncomfortable draughts. You™ll feel warmer in winter without needing to turn up the thermostat.

4. Noise Reduction
As an added bonus, draught-proofing can also help reduce external noise. The same seals that block cold air also act as a sound barrier, which is particularly beneficial for homes located in busy London streets.

5. Cost-Effective Energy Efficiency
Compared to full window replacement or installing secondary glazing, draught proofing is a far more affordable way to improve your home™s energy efficiency. In many cases, homeowners can recoup the cost of draught proofing through energy savings within just a few years.

4. Will Draught Proofing Affect the Look or Operation of My Windows?

Absolutely not. One of the reasons homeowners choose Mortice & Green for draught-proofing services is our attention to detail. The brush pile seals we install are slim, discreet, and colour-matched to blend seamlessly with your existing windows. We ensure that your windows remain fully functional, so you can continue to slide them open and closed with ease.

For listed properties and homes in conservation areas, our draught-proofing solutions meet all relevant guidelines, so there™s no risk of compromising the historical character of your home.

5. Combine Draught Proofing with Double Glazing for Maximum Efficiency

For homeowners looking to maximise energy savings, draught proofing can be combined with double glazing existing sash windows. This approach retains the original frames while adding modern glazing, significantly improving insulation and further reducing heat loss.

At Mortice & Green, we can retrofit double glazing into your existing sash windows, pairing it with draught-proofing for a comprehensive energy-efficiency upgrade.

Cut Your Energy Bills with Mortice & Green

Draught-proofing is one of the simplest yet most effective ways to improve the energy efficiency of your sash windows. Not only will you enjoy a warmer, quieter home, but you™ll also reduce your carbon footprint and see real savings on your energy bills. At Mortice & Green, we combine traditional craftsmanship with modern energy-saving techniques to deliver the best sash window services in London. Get in touch with our expert team today and get a quote.

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21 Jan

Why choose professional sash window repairs over DIY?

When you need sash window repairs your first thought automatically goes to money and how much it™ll cost. For some, they think the costs will be too high and turn to DIY. You can™t blame people for considering do-it-yourself repairs. It feels like the easy option but while it might sound fun, it isn™t practical when it comes to repairing sash windows. So, why should you choose professional sash window repairs over DIY?

Quick repair times

Sash window repairs must be done properly otherwise problems can arise. With DIY repairs, you need to find time to inspect the windows and then make the necessary repairs. You can™t rush this either. It™s not easy, to say the least, and that™s why sash window repairs should be dealt with by a qualified technician.

Professional repair services can be with you on the same day as you call them and have the repairs done in no time. It™s a far cry away from tackling the repairs yourself.

Access to better materials

You are almost guaranteed a quality finish when you hire professional repair services. They have access to the best materials and tools which are crucial. When you go down the DIY route, you don™t have access to the same quality materials which can make a huge difference. That™s why DIY repairs are not always the best. Sash window repairs should be dealt with by a professional because they know how to handle the necessary repairs.

DIY is a romantic thought that crumbles after the first attempt

Let™s be honest, you love the idea of DIY repairs because it seems the best way to save money. Unfortunately, it often works in reverse and costs you more. The reason is that you aren™t qualified to handle the repair. You might think you™ve dealt with the problem but it quickly resurfaces. Sash window repairs can be tricky if you don™t know what you™re doing. Calling in a professional is better because DIY is time-consuming and costly.

Let the professionals handle sash window repairs

Sash windows are beautiful and can make your home stand out for the right reasons. While you can be tempted to handle the repairs yourself it isn™t advisable because one error can cost a fortune to fix. You might make the problem worse or cause a new one entirely. It isn™t always straightforward, especially when you aren™t qualified in this field. Professionals will make sash window repairs so much easier.

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19 Dec

How to draught-proof sash windows

Sash window repair is essential to maintain the integrity of the windows and home. The windows are a gateway to the home and when they™re compromised, they make a home less efficient. When draughts form, it™s necessary to take the appropriate steps to keep the cold out. So, how can you draught-proof sash windows and why should you call in the professionals?

Replace the draught-proof strip

All windows have a draught strip, and it typically keeps the draughts out. Unfortunately, these strips can become damaged by various elements, including the weather and general wear and tear. When this happens, draughts are more likely to occur. Replacing the strip can be incredibly important to ensure draughts remain out. Sash window repair is crucial and having a professional install the draught strip is a necessity.

Install a parting bead

Sash window repair is necessary when the parting bead needs to be replaced. This can be quite a difficult repair to make, and professionals will be needed. Professionals are ideal for sash window repair and draught-proof a home. They can install a new parting bead and ensure the windows keep the draught out too.

Replace the staff bead

Sash windows have an internal trim, called the staff bead. Unfortunately, this is prone to wear and tear. Often, it can contribute to draughts opening up around the window and be fixed quickly. Sash window repair can be important to keep out the draughts and maintain the integrity of the windows. Professional window repair services can replace the staff bead and help seal the window from draughts.

Sash window repair should be done by the professionals

Draughts are a nightmare and can make a home incredibly cold. Sash window repair can be a necessity when a new draught appears. Remember, it™ll be difficult to retain heat in a room with a draught because the cold air will continue to seep in. Sash windows are beautiful and calling in a professional to maintain them is crucial. Professionals can deal with draughts and take steps to close them successfully. Sash window repair should only ever be done by a professional to ensure the best finish.

Protect your home from draughts

Draughts are frustrating at any time of the year, but even more so during the winter months. Typically, they originate from the window and it™s necessary to resolve the issues quickly. Draught-proofing your windows is crucial to maintaining their integrity. Calling in the professionals to deal with repairs is important, so too are calling them in when you want to draught-proof the windows. Sash window repair and draught proofing the home should be done by professionals as they make the job easier.

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19 Nov

What are conservation area rules for windows?

Replacing sash windows is pretty straightforward. Unfortunately, when you live in a conservation area, that makes the matter far more complicated. You wouldn™t think windows would cause too much trouble for homeowners, but homes built within a conservation area need special permission to be replaced or repaired. So, what are the rules for windows in a conservation area?

Permission is needed for all sash windows

Regardless of whether you want to upgrade or repair old windows, they are likely to require special planning permission from the local authorities or conservation board. It™s a huge challenge because double glazing and UPVC windows are typically banned in conservation areas. The reason is down to the fact that conservation is there to protect the look of the original building. So, every little change (to the exterior) must be sympathetic to the original design.

It means replacing old sash windows becomes tougher, although not impossible.

Is planning permission necessary for all conservation areas?

In simple terms: yes, you are typically going to need permission to make any alterations or changes to windows in conservation areas. Typically, local authorities want to see more like-for-like repairs than new window installations. That doesn™t mean to say you can™t repair old sash windows on your property; you just have to do so in a manner that™s in line with current guidelines.

Understanding the guidelines

Planning applications are necessary to install new sash windows. Remember, if the new windows ˜destroy™ or are considered a ˜threat™ to the character of the building, your application may be rejected. It is, however, possible for you to install UPVC windows even in a conservation area. Of course, the number one rule to this is that the new windows cannot be significantly different from the original design.

Why are there restrictions in conservation areas?

Conservation areas were created to protect and preserve historical buildings. It can be a great thing as period properties (that hold lots of historical value and beautiful designs) are preserved for the next generation. Of course, there are drawbacks to conservation, including issues replacing old sash windows.

It™s important to seek advice before installing new windows or making any changes to the building. You should also understand the local restrictions and laws when it comes to conservation. Typically, if your new windows are in line with the old sash windows, your application shouldn™t run into difficulty (not much, anyway).

Know where you stand before you make any alterations

Buying a listed or protected building can be wonderful because it™s a part of history. Some of the original features can be gorgeous and priceless in many ways. Of course, there are issues with making changes, especially to the exterior of the property. You™ll need special planning permission to alter the windows of a listed building or one that™s within a conservation area. Fortunately, with a little know-how, you can install new sash windows or make repairs with little effort.

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26 Oct

How to winter-proof your sash windows

As energy bills are rising, and temperatures are dropping, you might be thinking about ways you can make your home more energy efficient. One of the things you might want to think about is your sash windows. While floors, walls and attics can be easily insulated against winter heat loss, windows are one of the biggest culprits of causing icy homes. Here are some of the ways you can winter-proof your sash windows¦

Hang thermal curtains

Thermal curtains are a great way of retaining warmth in your rooms. They form an insulated barrier against cold windows, trapping old air between the glass and the window, preventing it from entering your home. If you want to make the most of the sun (on those days it™s out), don™t forget to open your curtains on sunny days so the heat can shine into your house.

Reseal your windows

Even a quick whip around with caulk can make a huge amount of difference when it comes to winter-proofing your sash windows. Keep an eye out for thin cracks or gaps around the edges of your window joints and caulk these to prevent icy drafts from flowing into your rooms. If you are looking for a more permanent solution, gaps around your windows may indicate you are in need of sash window repair.

Apply a temporary window film

A window insulation film is made of thin, transparent plastic (quite like cling film), which is applied to windowpanes before being heat shrunk using a hairdryer. This creates a close fit around the windows that can be useful for draught-proofing windows in winter.

Upgrade your sash windows

Naturally, the ultimate way to winter-proof windows is to upgrade them to double-glazed timber units, which are specially designed to keep the heat in your home. Double glazing works with the air itself which acts as a poor conductor of heat, trapping an insulating blanket of air between the panes of the glass. This layer of air acts as a barrier, keeping your home warm.

If you are considering upgrading your sash windows, whether they are in need or repair or you want them to be more energy efficient, we can help you. We restore and repair sash windows across London, get in touch to find out more.

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23 Jul

Sash Windows vs Casement Windows

When it comes to choosing windows, it™s between sash and casement windows which both have their differences in the way that they function.

The correct window makes all the difference when it comes to the property™s look. There are two principal types of windows: casement and sash. Once the correct type is chosen, it™s best for consistency to have the same style throughout the house.

The main difference between a sash and casement window is as follows: casement windows are very common and come with hinges that allow them to swing open easily. They are bought in pairs. They have a crank which also allows the window to lock in place “ usually a handle fits into place. The benefits of it are it prevents the wind from pushing the window out of place.

Sash windows are different and remain popular “ they are made up of multiple panels that slide on top of another to create separate individual openings. There are two main types of sash windows: those with two mobile sashes and the others which have one fixed and a mobile sash.

The Advantages of Casement Windows

The debate centres on which is the best one for the actual home environment. Casement windows are very energy efficient allowing for a tight seal.

Casement windows have a popular modern look ideal for the domestic setting “ as well as being available in a variety of materials and styles.

The casement window allows for better protection against home invasion, as they provide resistance to break ins. They would have to smash the window to break in which would alert anyone in the premises.

The greatest advantage is large glass panels which allows the most amount of light to enter.

The Advantages of Sash Windows

Sash windows can open easily and have a more basic design with less room for functioning problems. This also allows for an easy fix if there™s a problem.

They provide a traditional look that complements the interior design of most period properties.

Another benefit is it opens inwards which means that no matter where the window is located, you™ll be able to open it and let the air inside without external obstruction.

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Why Draught Proofing Your Sash Windows Can Cut Energy Bills
17 Dec

The Benefits Of Sash Windows

Sash windows are a stunning option for your home. They contain two frames that slide vertically which improves airflow. Plus, their design derives from 17th century England which gives them a historical and aesthetic look. Here are a few reasons why you should install sash windows.

Why Install Sash Windows At Home

Good For The Environment

Sash windows often contain a timber frame which makes them very environmentally friendly. This is because it takes less energy to create and transport these windows. Not to mention, timber can be easily recycled or reused so a sash window itself is made from recycled materials.

Intricate Design

Sash windows can be designed in various ways to suit your style needs. It is possible to carve, paint or stain the wooden parts to maximise the beauty of your home. Standard windows with plastic frames do not offer this option so this versatility is incredibly valuable. Whatever style you are looking for, you can customize the timber frame of a sash window to match your requirements.

Highly Durable

A sash window can resist tough weather conditions for many years due to the strong fibres and cellulose within the wooden frames. So sash windows are a phenomenal investment as they can last a very long time. As a material, timber is just as durable as those used in construction.

Help To Keep Your Home Warm

Timber sash windows are brilliant for insulation and in these cold, winter months they can help your home feel warm and toasty. After all, wood is often used in wooden frames as it is durable and provides great insulation. Additionally, modern sash windows are drought-proof which further prevent cold from coming in. Therefore, sash windows can help lower your energy bills as you don™t have to blast the central heating constantly.

Always Fashionable


Sash windows are a beautiful asset to any property and it has been this way for many years. It is always in high demand, so installing them can increase the value of your home. Furthermore, sash windows are continually improving with new features and designs to complement the appearance and comfort of your house.

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12 Nov

Should I Repair Or Replace My Sash Windows?

Sash windows are a common feature of houses in the UK. Despite looking aesthetically pleasing, over time they can become less energy efficient. But how do you know when it is time to invest in sash window repair or replace it altogether?

How You Can Repair Sash Windows

A common problem with older sash windows is the lack of insulation they provide. Single, glazed panes can wear down and become draughty which may lose heat from your household.

However, you can easily fix this problem by upgrading to double glazing instead. This can be done without replacing the sash window.

Repairing your sash window with double glazing allows you to trap a greater amount of heat. In addition, two strong panes trap a gas between them like krypton or argon which forms a superior barrier between the warm inside and cold outside. This prevents thermal bridging and condensation, both of which can make a home much cooler.

Sash window repair is an investment, yet in the short term, you will have a warmer house, lower energy bills and won™t need to get rid of your existing window frames.

Why You Should Replace Them

Notwithstanding, there are situations where you are better off replacing your sash windows.

Upgrading your windows with better materials increases the chances of it lasting longer. For example, modern glass is very durable and newer frames are more resilient when it comes to water damage and rot. So you won™t have to worry about window repair for a long time.

Another reason is if your house is extremely cold or droughty. Modern sash windows are much better at preventing heat loss. Double glazing makes it more difficult for air to get through while high-quality timber frames are less likely to swell.
Finally, sash window repair could be the more expensive option long term. After all, an old window may need regular maintenance to ensure it is still working properly. In contrast, a one-off investment of new, modern windows will keep your home warm for years to come and simultaneously lower energy bills.

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