Traditional sash window specialists in London Get a Free Quote
Get a Free Quote

Sash Window Repairs London — Repair, Not Replace

Traditional sash window specialists covering every London postcode. We repair, draught proof and double glaze your original sashes, with a five-year guarantee.
Get a free quote See our prices
  • Five-year guarantee
  • Repair-first ethos
  • 15+ years' experience
  • VAT-registered Ltd company
  • Listed & conservation work

Sash window specialists for London homes

London Sash Window Repairs mends original timber sash windows across Greater London. We repair first, because that keeps the joinery your home was built with. Every job starts with a free site visit and a written quote, and it ends with a five-year guarantee on our labour.

Our sash window services

Most jobs fall into three groups: sash window repairs, draught proofing and double glazing existing sash windows. We also cover sills, cords, glass, locks, French doors and listed homes. Pick the service below that matches your problem, because each one has its own page. You can also see the full list of services.

Sash Window Repairs

Repair-first sash window specialists across London, fixing cords, rot, sills, putty and rattles with a five-year guarantee on labour.

Sash Window Draught Proofing

Hidden nylon brush seals that stop draughts, rattles, dust and some noise in London sash windows, with a five-year guarantee.

Double Glazing Existing Sash Windows

Retro-fit sealed double-glazed units into your original London sashes from £480 a window, keeping the period look and the original timber.

Sash Window Overhaul

Sashes out, new cords, beads and hardware, and a hidden draught-proofing system, for £188 a window with a five-year guarantee.

Sash Cord Replacement

We re-cord and rebalance broken box sash windows across London from £120 a window, with the weights checked and a five-year guarantee.

Sash Window Sill Repairs

We splice out rot and replace a sill only when a repair no longer makes sense, from £120 per window with a five-year guarantee.

Replacement Sashes and Sash Windows

Like-for-like replacement sashes from £190, plus double-glazed sashes and full window replacement when repair no longer makes sense.

Listed Building and Conservation Sash Windows

Careful like-for-like sash work for listed homes and conservation areas across London, handled case by case with a five-year guarantee.

Sash Window Glass Replacement

We replace cracked or broken sash glass with 4mm clear, 6.4mm laminate or satin glass, or any glass in the Pilkington range.

Sash Window Locks and Security

We fit catches with every overhaul and add locking restrictors on request, so you can meet any insurer's lock rules.

French Door Repairs and Draught Proofing

We repair, restore and draught proof French doors, and fit locking sets on request, with a free visit and written quote.

Why we repair first

Most failing sash windows need a repair, not a replacement. Broken cords, a rotten sill or a stuck sash can almost always be fixed. As a result, you keep your original frames and avoid the cost of new ones.

However, repair does not suit every window. If a sash can no longer carry glass, we say so honestly. In that case we make a like-for-like replacement sash from £190, or we double glaze the existing sash from £480.

Draught proofing is often the best first step because the brush seals sit inside the frame. You cannot see them when the window is shut. Our system also stops rattles and dust, and it comes with a five-year guarantee.

Not sure what your windows need? Read our guide on whether to repair or replace sash windows. You can also check the price list, since a clear price helps you decide.

London areas we cover

We work in every London borough and often just outside the M25. These are the areas we visit most, and each page explains the local housing, because every borough differs.

See every London area we cover

Latest guides

Our guides explain common sash window problems in plain English. Each one links to the service that fixes it, because we want you to go from advice to a quote easily.

Browse all sash window guides

Common questions

How much do sash window repairs cost in London?

A standard overhaul and draught proof costs £188 per window. Sill replacement is £120 per window and a replacement sash starts at £190. Double glazing an existing sash starts at £480. However, the final price depends on the timber and the access, and every quote is free.

Do you work on listed buildings?

Yes, we handle listed and conservation work case by case. Send us your address and a few photos, and we will talk through the right route. We do this before any work starts, because surprises help nobody.

Which London areas do you cover?

We cover all Greater London postcodes. We also travel just outside the M25 on many jobs. If you are unsure, send us your postcode and we will confirm.

What does the guarantee cover?

Every job carries a five-year no-quibble guarantee on our labour and on the draught-proofing system. Sealed units in double-glazed existing sashes carry the same five years. If a defect appears in that time, we come back and put it right.

How do I get a quote?

Fill in the form on this page and tell us what is wrong with your windows. We then book a free site visit and send a written quote. Photos help, so add them to your message if you can.

Get a free quote