House Builders in Cockfosters, EN4

As a guide, single storey extensions in Cockfosters typically cost around £2,500 to £3,500 per square metre. Double storey extensions are usually around £2,200 to £3,200 per square metre. A typical 30 m² single storey rear extension would therefore cost around £75,000 to £105,000, before professional fees and VAT. Premium glazing and large structural openings would push the cost towards the top of the range.

Most loft conversions in Cockfosters cost between around £60,000 and £90,000, depending on the size of the house and the type of conversion. Larger hip-to-gable and dormer conversions with an en-suite bathroom sit towards the top of that range.

Full renovations typically cost around £1,800 to £2,800 per square metre for a high standard of finish. Projects with structural changes, bespoke joinery, premium kitchens and luxury bathrooms can exceed £3,500 per square metre.

Single storey extensions usually take 12 to 16 weeks, and double storey extensions 16 to 24 weeks. Loft conversions typically take 8 to 12 weeks, and full renovations 6 to 12 months. New builds and knock down and rebuilds usually take 9 to 18 months.

Most of Cockfosters is covered by Enfield Council, although some nearby EN4 addresses are within Barnet. We check this at the start so your application follows the correct local policies.

Yes. We work closely with architects to make sure designs, materials and detailing respect the character of the conservation area and the setting of Trent Park.

Many homes outside the conservation area can be extended under permitted development, within set size limits. Conservation area properties, homes that have already been extended and some properties near the Green Belt may need full planning permission. We’ll help you check before work begins.

We require a minimum deposit of 20% of the overall labour and materials upon the start of the project.

Payments for your house build are made in instalments, with a payment typically made every 2 weeks – which is carefully recorded on our logs.

According to Bricks & Logic, the average sale price in Cockfosters was £735,666 in June 2026. Houses in the EN4 part of Cockfosters average around £1.17 million, reflecting the area’s large plots and family homes.

Extending or renovating is often a cost-effective alternative to moving, adding space and value while keeping you close to Trent Park, good schools and the Piccadilly line.

Call us on 07850 763 556, fill in the form on our contact page, or email vzbuilders@hotmail.com. We’ll arrange a free site visit at your Cockfosters home and come back with a detailed itemised quote within one working day of our visit.