Period English manor house with deer at dusk

Sash Window Repair in London

5-star rated  ·  All London covered  ·  Free quotes

Fix stuck, draughty or broken sash windows — without replacing them.

  • Broken sash cords fixed
  • Cracked glass repaired
  • Draught proofing for warmer homes
  • Windows working like new
  • Repaired, repainted and fully restored

Same-day response available

5yrWorkmanship
guarantee
5.0Google rating
★★★★★
FreeSurvey &
no-obligation quote
Our Philosophy

Repair First.
Replace Only
When Necessary.

About Hartwell Sash →

London's period homes were built to last — and we believe they still should.

Original sash windows have character, balance and craftsmanship you simply can't replace. Our job is to keep them working as they should — smoothly, quietly and reliably.

We focus on repair first. That means fixing what's broken, stopping draughts, restoring movement, and bringing your windows back to life — without unnecessary replacements.

If something truly needs replacing, we'll tell you honestly. No pressure. No upselling. Just clear advice and proper work.

Most of our work comes from homeowners who want things done properly — not quickly, not cheaply, but right. And once it's fixed, it stays fixed.

What We Do

Our Services

Each service draws on the same principle: do it right, do it once, and make it last.

How It Works

Simple. Straightforward.

1

Send Photos

Snap a few images of the window. WhatsApp or email — whatever suits you.

2

Get a Quote

Clear, itemised pricing — often the same day. No guesswork, no hidden charges.

3

Book a Date

We agree a convenient time and confirm by message. Simpler jobs are usually a half-day.

4

Job Done

We work cleanly, leave no mess, and back everything with a 5-year workmanship guarantee.

Restoration Specialists

Timber Door
Restoration

Period front doors, internal Victorian doors and panelled joinery — stripped back, rebuilt and finished to last. We repair rather than replace, keeping original profiles and mouldings completely intact.

Enquire About Your Door →
Further Expertise

Conservation & Listed Buildings

Heritage Craft

Sash Window
Full Restoration

From draught-proofing and cord replacement through to complete frame rebuilds — the full spectrum of period sash window work.

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Specialists

Conservation &
Listed Buildings

We understand the requirements of conservation areas and listed building consents. All work in keeping with planning conditions — sympathetically, respectfully, correctly.

Learn More →
Client Reviews

Trusted by Homeowners Across London

★★★★★  ·  5.0 on Google

"
★★★★★

Nick replaced broken sash cords quickly and efficiently. Very tidy work — wouldn't hesitate to book again. Excellent value for the quality of the result.

JB

Janet Bohrer

Google Review

"
★★★★★

Great job fixing our window. Clear communication and fast work — exactly what you want from a tradesman. Arrived on time, left everything spotless.

AG

André Gomes

Google Review

"
★★★★★

Outstanding craftsmanship and genuine attention to detail. The windows look and feel completely renewed. You can tell this is done by someone who really cares.

KP

Konstantin Prichodka

Google Review

Working Across London

Period Windows.
Properly Restored.

  • Fully insured & accredited
  • 5-year workmanship guarantee
  • Many repairs completed in a single visit
  • Free survey & no-obligation quote
  • Listed & conservation area specialists
Get a Quote

Send a Photo.
Hear Back Today.

Snap a few photos of your windows and send them over. We'll come back with a clear, itemised price — no guesswork, no pressure.

Coverage

Every Borough. All of London.

View all areas →
WhatsApp