Trade cover image
Trade profile image

Sash Doctor

10/10

London

Checkatrade member since December 2013
10

Services

  • Wooden Sash Windows Installation
  • Timber / Wooden Windows Installation
  • Bay Windows Installation
  • Draught Proofing
  • Timber / Wooden Windows Repair
  • Bay Windows Repair
  • Wooden Sash Windows Repair

Customer Reviews

Write a review

10 /10

Based on 6 reviews over the past 12 months

Quality of work

10

Reliability

10

Communication

10

Reviews (138)

  • 10

    A+ sash window general refurb and draft proofing

    Posted 1 day ago

    We are based in Walthamstow Village and needed the original sash windows, living room casement and original front door refurbished and draft proofed. Friends recommend Jason and we couldn’t be happier with the service he provided. He repaired the rotting timber and sashes, replaced the locks, and draft proofed everything. No more rattling windows! Some of the sills were completely rotted before but everything looks and feels fantastic now. We thought we’d need to spend tens of thousands to replace the windows like-for-like but this general refurb has given them a new lease of life. Thank you!
    Job location: E17
  • 10

    Excellent!

    Posted 26 March

    Jason was fantastic! Highly skilled and knowledgeable, and got the work done quickly and efficiently. Couldn’t rate him highly enough.
    Verified reviewer
    Job location: E17
  • 10

    Great workmanship to an excellent standard, completed quickly and efficiently

    Posted 20 January

    Jason and James have just been back to re-furbish and draught-proof our back sash windows. Great job as usual. They worked constantly and so well together so that the work was done to an excellent standard but completed quickly and efficiently. Those rooms are so much warmer now. It’s like a different house!! We’re so pleased we’ve booked them to return in the Spring to do our sash windows at the front.
    Verified reviewer
    Job location: E17
  • 10

    Exceptional standard of craftsmanship and expertise

    Posted 19 December 2025

    Jason did an exceptional job repairing our original wooden sash boxes and cills. He responded immediately to our request and we were lucky as he was able to fit in a repair the next week. He is polite, helpful, works expertly and efficiently leaving no mess and removing the rubbish. A true professional and extremely good value. We’re booking him to re-furnish and draught-proof our remaining wooden sash windows next year.
    Verified reviewer
    Job location: E17
  • Lola R
    10

    Window refurbishment and draft proof sealing system installation

    Posted 29 October 2025

    Jason and team did an amazing jobs repairing our original timber windows. Everything was done quickly, from initial contact, to quote to finalising the job. Extremely happy with our results, would 100% recommend!
    Verified reviewer
    Job location: N13
  • 10

    Very Professional Service

    Posted 15 October 2025

    Jason is very professional and gives a first class service. This is the second time we have used Sash Doctor. We used him to draft proof our sash windows on our last house and now on our new house. Will always recommend to friends and family. House feels so much warmer and less noise from the outside.
    Job location: N8

Company Info

Owner

Mr Jason Vanderhyde

Sole Trader

13 years on Checkatrade

VAT Registered

No

Domestic WorkCommercial WorkFree EstimatesInsurance Work Undertaken24 Hour Call-out

Based in London, we are the sash window refurbishment and draught proofing specialists.

Lower your heating bills with our draught proof sealing system, guaranteed to stop all draughts and rattles.

Speak to us today for a test window.


Our services include the following:

  • Sliding wooden sash windows
  • Draught proofing
  • Sash cords repair
  • Relieving jammed sashes
  • Treatment to decaying timber
  • Full renovation service
  • Security locks and stops
  • Painting service provided


Sash Doctor uses a method for reducing draughts with discretely positioned seals that conserve energy and improve thermal comfort.

Many timber windows are inherently draughty. With gaps of 3mm and more around the edge, they typically account for 20% of the heat loss from your home.


Our sealing system will usually reduce this heat loss by about 80%. It will also reduce noise transmission, dust penetration and eliminate rattles during windy weather.

While you may wish to retain the weathered fixtures of your windows, a complete range of quality brass locks, stops and fasteners are available.


Accreditations and awards

This trade passed up to 12 Checkatrade vetting checks

Member since December 2013

Individual checks

  • Identification

  • Proof of address

  • Financial

  • Qualifications and accreditations

  • County court judgement

  • Open source media

Business checks

  • Customer Reviews

  • Company trading history

  • Company duplication

  • County court judgement

  • Enhanced business check

  • Director checks

More tradespeople