★★★★★4.8 on Google from 30+ reviews
Cox Format Developments Ltd. — builders in London
Cox Format Developments Ltd is an award-winning building company that builds house extensions and loft conversions in North London, including Barnet, Enfield and Hertfordshire. The firm is also recognised as a Which? trusted builder.
What Cox Format Developments Ltd. does — and what it typically costs in London
Every job below can be priced from this page. The ranges are what London homes typically pay, from Locufy's price guides. Cox Format Developments Ltd. confirms the exact figure in a written quote — asking is free, with no obligation.
Building & extensions
Kitchens, bathrooms & interiors
Roofs, walls & windows
Typical prices from Locufy's UK 2026 price guides — each guide explains what the job involves and what moves the price. Rendering and insulation installer are also offered, priced on survey.
About Cox Format Developments Ltd.
Cox Format Developments Ltd is an award-winning building company that builds house extensions and loft conversions in North London, including Barnet, Enfield and Hertfordshire. The firm is also recognised as a Which? trusted builder.
You can ask for a written price on any building job from this page — an extension, a kitchen refit, a roof that leaks — and compare it with other London builders if you want to.
At a glance
- Trade
- Building and construction
- Based
- Hadley, Barnet
- Covers
- London and 15 km around
- 4.8 · 30+ reviews
- Hours
- Mon–Fri 7:30–16:00
- Quotes
- Written, free, no obligation
A written price, with no obligation
Describe the job
A line or two and a photo if you have one — it takes a minute.
Cox Format Developments Ltd. prices it
Locufy passes it on; they come back to you with a written price.
Book, or compare
Happy? Book the date directly with them. Not sure? Compare quotes from other London builders.
How Cox Format Developments Ltd. is rated
As published on Google, refreshed on each visit.
Read the reviews on Google →Reviews from Locufy bookings appear here
Every Locufy review comes from a job booked through Locufy, so each one is a real customer. Booked Cox Format Developments Ltd.? You can leave the first one after the job.
Have a question before you book?
Do they handle planning? Are they on the voluntary construction register? Ask here — Locufy passes it to them and emails you their answer.
London and the towns around it
Based in London, Cox Format Developments Ltd. works across the city and about 15 km around it.
- London
- Enfield Town
- Harrow
- Tottenham
- Watford
- Walthamstow
- Wembley
- St Albans
- Edmonton
- Chingford
Before you book
Which areas do you work in?
Cox Format Developments Ltd works in North London and nearby areas, including Barnet, Enfield and Hertfordshire.
What types of building work do you do?
The company builds loft conversions and house extensions.
Do you keep to the price you quote?
Yes, the company quotes a price for each job and aims to keep to it.
Has the company won any awards?
Yes, Cox Format Developments Ltd is an award-winning building company.
Get a written price from Cox Format Developments Ltd.
You can compare it with other London builders too.
·Builders in London·Builder in London·Report this pageIs this your business? Claim it free →