# London Box Sash Windows Ltd

London Box Sash Windows Ltd is a carpenter / joiner in Tulse Hill. Rated 5.0/5 from 141 public reviews across 1 review source. This is the MyTrustedTraders public-evidence profile for this trader, with independent reviews, credentials and registry data from named public sources, no ads, and no paid placement.

Trust Score: 58 out of 100 (good record, gaps to check). The score rests on rated 5.0 from 141 reviews.

## About
London Box Sash Windows is a family-owned and operated business that has been providing London homeowners with high-quality, custom-made timber sash windows for over 40 years. We use only the finest timber and double-glaze our windows to provide excellent insulation and energy efficiency. Our windows are also built to the highest standards and are backed by a comprehensive warranty. We offer a wide range of timber sash window styles to choose from, including horns to match existing designs, traditional looking double-glazed units, casement windows and french doors If you are looking for high-quality, custom-made timber box sash windows, then London Box Sash Windows is the perfect choice for you. Contact us today to schedule a free consultation and estimate. FENSA Registered Company 0208 648 4230

## Public review evidence (by source)
| Source | Average rating | Reviews |
| --- | --- | --- |
| Which? Trusted Traders | 5.0/5 | 141 |

## What customers consistently say
_Recurring strength themes from this trader's own reviews, each with a verbatim quote:_
- **Clear communication** (Quoted from 3 reviews): "I was kept informed at every stage of the project" · Which? Trusted Traders
- **Reliable and punctual** (Quoted from 3 reviews): "He arrived on time every day" · Which? Trusted Traders

_Respectful and tidy in your home (3 reviewers describe them being respectful of the home and leaving it clean):_ "installers were not only efficient but left everything spotless" · Which? Trusted Traders

## What customers consistently praise
_Themes mentioned across this trader's own public reviews:_
- Professional (mentioned in 48% of reviews we've read)
- Friendly & polite (mentioned in 32% of reviews we've read)
- Fast & efficient (mentioned in 28% of reviews we've read)

## Trades
Carpenter / joiner

## Services they list
_Listed on public sources or the business's own website; check directly that they cover your job before you book:_
- Window consultants
- Sash windows
- Replacement window services and repairs
- Timber windows
- Double glazing installation
- Joinery and carpentry
- double-glazed timber sash windows

## See their work
_Portfolio and gallery links this business publishes. Inspect the source to see what each image represents:_
- [Photo gallery](https://www.londonboxsash.com/portfolio/)
- [Facebook](https://www.facebook.com/londonboxsashwindows)

## What we checked, and when
_What MyTrustedTraders independently checked for this business (verified items only):_
- Review volume: MyTrustedTraders shows 141 public reviews on this profile. (via MyTrustedTraders public listing)
- Public listing spread: MyTrustedTraders shows 2 public listings for this trader. (via MyTrustedTraders public listing)
- Business identity: MyTrustedTraders shows public business identity data with operating status unknown. (via MyTrustedTraders public listing)
- Contact phone: MyTrustedTraders shows a public phone contact on this profile. (via MyTrustedTraders public listing)
- Website: MyTrustedTraders shows a public website for this trader. (via MyTrustedTraders public listing)
- Current credentials shown: MyTrustedTraders shows 1 current credential on this profile. (via Public credential evidence)
- Work photos: MyTrustedTraders shows 1 work photo on this profile. (via MyTrustedTraders public listing)

Full verification checklist: https://mytrustedtraders.com/traders/london-box-sash-windows-ltd/checks

## Credentials & sources
- Credentials shown: 2 (1 currently verifiable, listed below)
  - FENSA: the competent-person scheme for replacement windows and doors, self-certifying they meet building regulations
- Companies House status: Unknown
- Website online since 2010 (verified via public domain registry)
- Evidence held from: Which? Trusted Traders, FENSA, Companies House
- Public evidence last checked July 2026

## What this business says about itself
_Self-declared on the trader's own website, not independently verified:_
- Good to know: Family-run

## Opening hours
- Source: Which? Trusted Traders
- Monday–Friday: 7:30am–1:30pm

## Before you hire a carpenter / joiner
_What to check when choosing this kind of trade (general guidance, not a claim about this business):_
- Look for consistent reviews across several named sources, not one polished profile.
- Check any credential evidence, and that the business details independently check out.
- Get a written quote and keep guarantee, insurance and payment terms in writing.
- Run the Cowboy Checker before you commit to anyone.

## Contact
- Phone: 020 8648 4230
- Website: http://www.londonboxsash.com

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Source: MyTrustedTraders, https://mytrustedtraders.com/traders/london-box-sash-windows-ltd
Real public evidence only: every figure traces to a named source and is cross-checked. If a source does not carry a field, it is not shown.