Barnet Council (London Borough of Barnet)
Builders in Barnet
Extensions, loft conversions and renovations in Barnet, from a fully insured London building team that understands local planning.
Homes in Barnet
Barnet is London's most populous borough, with large areas of interwar semi-detached and detached houses, Edwardian homes in Finchley, and the Arts and Crafts houses of Hampstead Garden Suburb.
What we build here
Two-storey side extensions, rear extensions, hip-to-gable lofts and full renovations of 1930s homes.
Planning and conservation in Barnet
Planning and building control in this area are handled by Barnet Council (London Borough of Barnet). Barnet has many conservation areas. In Hampstead Garden Suburb, the Hampstead Garden Suburb Trust's scheme of management means works may need Trust consent in addition to planning permission. Before you design, check whether your property is in a conservation area, is listed or is covered by an Article 4 direction; these change what you can build without permission. Our guide to permitted development in London explains the national rules, and loft conversion regulations covers roof works.
Larger plots in Barnet often suit bigger extensions than are possible in inner London.
Typical building costs in Barnet
Building costs in Barnet typically follow outer London rates of about £2,500 to £3,500 per m² for standard residential work, with high specifications and tricky access at the upper end or above. Budget on top for professional fees (about 15%), consents and contingency (8–15%) and VAT at 20% on extensions and renovations. These are indicative industry ranges for 2026, not a quote; see our London cost guide or request a fixed quote.
Neighbourhoods we cover in Barnet
Questions about building in Barnet
Do you cover all of Barnet?
Yes. We work throughout Barnet, including Finchley, Hendon, Golders Green, Mill Hill, Edgware, Whetstone, High Barnet, Hampstead Garden Suburb, and across the rest of London.
Do I need planning permission for an extension in Barnet?
It depends on your property. Houses outside conservation areas may be able to use permitted development, while flats, conservation areas and Article 4 directions usually mean an application to Barnet Council (London Borough of Barnet). A Lawful Development Certificate gives certainty.
How do I get a quote?
Send the form with your postcode and project details and we will reply by email, usually within one working day.
Nearby: Ealing · Hammersmith & Fulham · Camden · Islington · Wandsworth · all areas
Enquiries across London
Get a quote for your Barnet project
Tell us about your extension, loft or renovation. We cover every London borough from our office at 119 Uxbridge Road, W7 3ST.
- Free, no-obligation quotes
- Fully insured in all building aspects
- Planning, building control and party walls explained