5 Best Window Companies in London (2026)

Independently ranked by our review of ratings, reviews and reputation · How we chose

By Brad Smith, Home Services Expert · ✓ Data verified August 2026 · 8 min read

A cracked pane or a draughty Victorian sash window is not something most Londoners can fix themselves, and the wrong contractor can mean a botched job on a period property. London's top window companies have logged over 1,000 Google reviews between them, and every one holds a rating of 4.8 or higher, so the decision comes down to whether you need a repair, a retrofit, or a full replacement.

Short answer: London Sash Window Repairs leads on review volume with 4.9 stars across 367 Google reviews, while London Window and Door Repairs and All Seal Glazing both hold perfect 5.0 ratings. Sash window retrofitting and double glazing are generally cheaper than full replacement, so ask each company which approach fits your property and budget.

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1. London Sash Window Rep…
2. London Window and Door…
3. Sash Windows London
4. All Seal Glazing Ltd -
5. Premier Windows Ltd
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London's Window Companies, Compared

#	Business	Rating	Reviews	Best for
1	London Sash Window Repairs Ltd	4.9 ★	367	Sash window repair and retrofit	View ›
2	London Window and Door Repairs	5.0 ★	176	Emergency and same-day repairs	View ›
3	Sash Windows London	4.8 ★	206	Full window and door replacement	View ›
4	All Seal Glazing Ltd -	5.0 ★	155	Emergency glazing and commercial glass	View ›
5	Premier Windows Ltd - Your local sash window installers established in 1999	4.8 ★	171	Established / award-winning installer	View ›

5 Best Window Companies in London (2026)

Our top picks, reviewed

#1 Overall🕑 Open 6 days/wk

London Sash Window Repairs Ltd

4.9367 Google reviews

London Sash Window Repairs Ltd specializes in sash window repair, retrofit double glazing and draught proofing on existing timber sash windows across London, with three decades of experience and a stated bias toward repairing original joinery rather than pushing full replacement. It has built by far the largest Google review base of any window company on this list.

What people praise

By far the deepest review history of any window company on this list
Reviewers repeatedly praise the team's craftsmanship and evident love of working with timber
Genuinely cheaper alternative to full window replacement, according to a reviewer who compared both
Found and fixed problems not visible until the windows were opened up, at no extra charge in one case

Worth knowing

Focused specifically on sash window repair and retrofit, so a full frame replacement may need a different contractor

Reputation scorecardrank in London

Rating4.9 / 5

Review volume367 · 97th

Confidencehigh

Recency2 months ago

Info completenesssite · phone · hours

Rating breakdown97% 5-star

✓ VerifiedSource: Google

Our take: The most-reviewed sash specialist in London and the clear choice if you want to preserve original timber windows rather than replace them outright, with real cost savings reviewers have confirmed firsthand.

Website +442033184912 Directions

#2🕑 Open 7 days↩ Responds to reviews

London Window and Door Repairs

5.0176 Google reviews

London Window and Door Repairs is a window installation and glazing company based in Camberwell, covering window and door repairs, glazing, locksmith services and emergency call-outs across London. It holds a perfect Google rating and reviewers repeatedly describe same-day service, including weekend and after-hours call-outs.

What people praise

Perfect 5.0 rating across nearly every review on file
Reviewers repeatedly describe same-day and even weekend emergency response
Staff named consistently across multiple reviews for reliability and speed
Covers both window and door repairs under one contractor

Worth knowing

One-off reviews mention minor issues but overall feedback is overwhelmingly positive

Reputation scorecardrank in London

Rating5 / 5

Review volume176 · 87th

Confidencemoderate

Recency3 weeks ago

Info completenesssite · phone · hours

Rating breakdown98% 5-star

✓ VerifiedSource: Google

Our take: The strongest option if speed matters, since reviewers repeatedly describe same-day fixes, including on weekends. A dependable emergency call for a broken window or door.

Website +442085357540 Directions

254, Camberwell Business Centre, 99-103 Lomond Grove, London SE5 7HN

#3🕑 Open 6 days/wk↩ Responds to reviews

Sash Windows London

4.8206 Google reviews

Sash Windows London is a window installation company in Battersea offering timber and PVCu sash windows, casement windows, bifold doors and entrance doors, all manufactured in-house at UK workshops. It runs a structured process from initial home visit through survey, showroom visit and installation.

What people praise

Reviewers consistently praise clear communication through a structured multi-step process
Manufactures its own windows and doors rather than reselling
Teams protect the home during installation and clean up thoroughly, according to multiple reviewers
Handles both heritage-style sash and modern casement window replacement

Worth knowing

A handful of lower ratings appear in the distribution, though the large majority are five-star

Reputation scorecardrank in London

Rating4.8 / 5

Review volume206 · 92th

Confidencehigh

Recency7 weeks ago

Info completenesssite · phone · hours

Rating breakdown90% 5-star

✓ VerifiedSource: Google

Our take: A strong pick for a full window replacement project with a clear, structured process from quote to installation. Well suited to larger jobs replacing multiple windows at once.

Website Book now +442083978666 Directions

90 St John's Hl, London SW11 1SH

#4🕑 Open 7 days

All Seal Glazing Ltd -

5.0155 Google reviews

All Seal Glazing Ltd is a glass repair and glazing company based near Tavistock Place, offering 24/7 emergency glazing for both domestic and commercial properties across London and the Home Counties. It holds a perfect Google rating and reviewers describe fast turnarounds on everything from blown double glazing to vandalized shopfront glass.

What people praise

Perfect 5.0 rating on every review on file
Genuine 24/7 emergency response for both homes and businesses
Reviewers describe same-day turnaround on urgent commercial glass replacement
Quoted price consistently matched the final invoice, according to a detailed reviewer

Worth knowing

Not currently a Google-verified business listing, so confirm credentials directly before booking

Reputation scorecardrank in London

Rating5 / 5

Review volume155 · 76th

Confidencemoderate

Recency8 weeks ago

Info completenesssite · phone · hours

Rating breakdown98% 5-star

✓ VerifiedSource: Google

Our take: A strong option for urgent glazing needs, whether a shattered pane at home or a commercial shopfront, with reviewers specifically praising honest, matching quotes.

Website +448002792420 Directions

Suites 85, 56 Tavistock Pl, London WC1H 9RG

#5🕑 Open 5 days/wk↩ Responds to reviews

Premier Windows Ltd - Your local sash window installers established in 1999

4.8171 Google reviews

Premier Windows Ltd is a window and door installation company in South London established in 1999, offering PVC, aluminium and timber windows and doors with FENSA accreditation since 2002. It is an award-winning brand with over 27 years of experience across changing market conditions.

What people praise

Longest continuous operating history on this list, since 1999
FENSA-accredited, relevant for building regulations compliance
Reviewers describe repeat business, including customers using the company more than once
Handles complications professionally, including delivery delays coordinated around renovation schedules

Worth knowing

Reviewers note occasional bumps during larger renovation projects, though the team resolved them

Reputation scorecardrank in London

Rating4.8 / 5

Review volume171 · 82th

Confidencemoderate

Recency4 weeks ago

Info completenesssite · phone · hours

Rating breakdown92% 5-star

✓ VerifiedSource: Google

Our take: The most established name on this list with real accreditation behind it, and a solid pick for coordinating window replacement within a larger renovation project.

Website Book now +442086834446 Directions

4 Grecian Cres, London SE19 3HH

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How we score

Every number on this page comes from public Google data on the date shown, not from opinion or payment. Rating is the business’s live Google star average. Review volume is how many customers have rated them, ranked against other London window companies. Confidence weighs the rating by that volume, so a 4.9 from hundreds of reviews carries more weight than a 5.0 from a smaller sample. Recency reflects how recently customers are still leaving reviews. No business can pay to change these numbers.

How much do window companies charge in London? (2026)

Window costs in London vary hugely between a single-pane repair, retrofit double glazing on existing sash frames, and a full window replacement across a whole property. We could not find a trustworthy, cited general pricing source that applies fairly across these very different scopes of work, so get itemized quotes from a couple of companies above and compare what is included.

Serving all of London

The window companies above cover London and the surrounding areas, including Battersea, Camberwell, South London and Central London near Tavistock Place. Searching for a window company near me? Every listing below shows a live phone number and directions so you can reach the closest option fast.

What to ask before you hire a window company

Is repair or retrofit an option, or does the property need full replacement?
Is the company FENSA accredited for building regulations compliance?
Does the quoted price match the final invoice, with no add-ons after the survey?
How is the property protected during installation, and is cleanup included?
What guarantee or warranty comes with the work?

Frequently asked questions

How did you choose these window companies?

We started from window and glazing companies in London with a public Google presence, then ranked by rating, review volume, consistency and recency. See How we score above.

Are these rankings paid?

No. Rankings come from the public Google data in the scorecard. A business can pay to be a Featured Partner, which adds a badge and top placement, but that never changes another business’s score or position on the underlying data.

How often is this updated?

The data carries a verified date (August 2026 on this page). We refresh listings periodically so ratings and review counts stay current.

Which company should I call for an emergency broken window?

London Window and Door Repairs and All Seal Glazing both offer fast or 24/7 emergency response, with reviewers describing same-day fixes for both homes and businesses.

Is it cheaper to repair sash windows than replace them?

Often yes. London Sash Window Repairs specifically retrofits double glazing onto existing timber frames, which a reviewer confirmed was more affordable than full replacement while achieving similar thermal benefits.

The bottom line

London Sash Window Repairs is the safe default for period properties wanting to preserve original windows, while London Window and Door Repairs is the strongest pick if you need someone fast for an emergency. Get the quote matched to the final invoice before any work begins.

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