Make Your Home More Comfortable and Energy Efficient by Draught Proofing Your Existing Period Windows

Stop the Draughts and rattles for good.

“Air infiltration can be reduced by as much as 86% by draught proofing your sash windows. You will also save a considerable amount of money on your heating bills too.”

It’s all about the benefits to you

Reduce damp & cold spots

Reduce draughts and cold spots in your home. Feel the difference.

Reduce external noise

Improve soundproofing – especially if you live near a main road, busy pub or noisy animals!

Reduce external moisture & humidity

External moisture and humidity cause mould and can lead to health problems.

Keep out insects

Insects belong in the outside world, not in your home

Keep out dirt

Anything that is airborne can make it through a draughty window.

Keep out pollen

Keep out pollen – the arch enemy of hay-fever sufferers.

Keep out car exhaust

fumesKeep out car exhaust fumes – which are bad for everyone.

Let’s talk about what we can do for you and your windows.

Draught proofing – The facts.

You may be surprised, but the total airspace around the average sash window is equivalent to a hole in the wall 6 square inches in size. That’s big enough to fit your arm through. Probably big enough to crawl through if you added them all together! With all this room for manoeuvre, it is no wonder that sash windows have a tendency to rattle and allow for draughts. Draught proofing sash windows can solve all of this easily.

It is also commonplace to position a radiator directly beneath, resulting in energy and money going literally straight out the window. Not only this but, where valuable heat escapes, undesirables can make their way into your home as well.

How will draught proofing my sash windows help?

Airspace is inherent to the design of sash windows; it is necessary to allow the window to move. The Envirosash Draught Proofing System will simply fill this gap with a soft brush, creating a barrier to all of those unwanted nasties and keeping valuable heat in. Your home will instantly become a cosier, cleaner, safer environment, not to mention cheaper and greener to run.

Will it be visible?

No. Using the Envirosash Draught Proofing System, the brush strips, known as a weather fin piles, are fitted between the inner and outer frames, sealing the gap. They will literally become part of the frame. This cannot be seen unless

How will it affect the movement of the sash windows?

It will improve it.

During the installation process we completely remove, rehang and rebalance each sash window. They will slide easily and won’t rattle. Where necessary, the frames themselves will be expertly restored by our experienced team, ready for draught proofing. Consider it a full service!

Will this require planning permission?

You won’t need planning permission for this; draught proofing sash windows are fully approved by English Heritage and conservation officers. In fact, thanks to a government green initiative, only 5% VAT is charged for this service. It is also strongly advised by the Energy Saving Trust.

In order to minimise heat loss and maximise noise insulation, it is highly recommended that draught proofing is combined with our slim double glazing service. In some cases this will require planning permission – you will need to contact your local conservation officer to find out. Read more here.

Ready to say goodbye to those pesky draughts and start saving money?

Happy customers

Client testimonials

Natasha, Maida Vale


"I used Envirosash to make 6 new sashes as well as an entirely new sash window. The windows are of the highest quality, beautifully made and draught-proofed. They keep the flat much warmer and we've already noticed how much quieter it is. Alex was competitive on price even taking into account the quality materials that he uses. I wouldn't hestitate to recommend Envirosash on the basis of their craftsmanship, reliability and general ease with which they performed the job."

Mervyn, Crouch End


"Alex was a pleasure to deal with and the job was done on time and as expected. His workforce did a high quality job and were always polite, helpful and attentive. They also made sure to clean up at the end of each day. We had most of the windows in the house replaced and it has made a real difference. Happy to recommend."

Sarah, Gravesend


"Had some replacement slim double glazed sashes fitted recently. Good craftsmanship and thorough job. Cleaned up every evening. Good to have a quote from someone who actually understands the work to be done, rather than from someone who is just a salesman. Would definitely recommend."

The Timber Window Specialist