Living With Period Windows No Longer Has to Mean Compromise

We are specialists at restoring, draught proofing and double glazing sash windows. No more draughts or condensation problems, just beautiful windows.

Stop Draughts, Rattles & Condensation

We can upgrade your sash windows with draught proofing and slim double glazing. Eliminating draughts, rattles and condensation.

Save Money On Your Heating Bills

Less heat lost through your sash windows means lower heating bills for you. On average Envirosash customers save around 25% on their heating bills.

Keep Your Original Period Windows

We recognise the value and character of original joinery. Which is why we always restore and conserve where possible before offering complete replacement.

Reduce Noise into your Home

Combining draught proofing with double glazing will significantly reduce the amount of external noise intrusion into your home. Peace and quiet like you’ve never known it.

“The Envirosash team were brilliant, organised, prompt and value for money. They left our home clean, tidy and most of all warmer than they found it.”

Mark & Dianna, Deal, Kent

Energy Efficient Solutions for Period Windows

Draught Proofing

No more draughty, rattly sash windows once our draught proofing system has been installed. Just a more comfortable and energy efficient home! Draught proofing your sash windows will make a significant difference to the comfort levels in your home.

Slim Double Glazing

Enjoy the benefits of double glazing whilst maintaining the original beauty and charm of your existing period windows. Eliminate condensation problems and significantly reduce external noise. Envirosash will transform the comfort of your home.

Window Restoration

We believe in restoration before replacement, which is why we always look to restore and conserve the original period features of your sash windows wherever possible. We go further than others in respect to restoration and repair work. No quick fixes.

Window Joinery

Traditionally constructed beautiful new joinery at competitive prices. We offer bespoke joinery for new build projects or to replace existing sash windows not suitable for double glazing. We use Accoya wood as it is durable and environmentally friendly.

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