North London

Construction Company in Barnet, North London

FinchleyEast FinchleyNorth FinchleyWest FinchleyHendonMill Hill

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Construction Services in Barnet

Barnet is one of London's largest boroughs by area and one of the most active for residential construction. Stretching from the suburban estates of Edgware and Mill Hill in the west to the leafy streets of East Barnet and New Barnet in the east, the borough's housing stock spans everything from compact 1930s semis to substantial detached Edwardian properties.

The demand for construction services in Barnet is driven by homeowners who want more space without leaving an area known for its excellent schools, green spaces, and transport connections. Rear and side return extensions are particularly popular across the borough's terraced and semi-detached housing, while loft conversions remain the most cost-effective way to add a bedroom and bathroom to the typical Barnet family home.

Our team has delivered dozens of projects across Barnet — from wraparound ground-floor extensions in Finchley to complete internal renovations in Hendon. We understand the local planning landscape, the construction challenges that come with Barnet's varied soil conditions, and the design preferences of homeowners in this part of North London.

Barnet Housing Stock

1930s semi-detached houses, Victorian terraces in Finchley, Edwardian detached villas in Totteridge, inter-war estates in Hendon, Arts and Crafts properties in Hampstead Garden Suburb, and modern developments in Colindale's regeneration area.

Planning in Barnet

Barnet Council's planning team processes a high volume of residential applications each year. Single-storey rear extensions up to 6 metres (detached) or 3–4 metres (terraced/semi-detached) typically fall under permitted development, though properties in conservation areas such as Monken Hadley, Totteridge, and Mill Hill require full planning applications.

Barnet has several Article 4 Directions that remove permitted development rights in specific areas — particularly around Hampstead Garden Suburb, where almost any external alteration requires planning consent. We manage every aspect of the planning process and maintain a 94% first-time approval rate across Barnet projects.

Recent Projects in Barnet

Double-Storey Side Extension

£110,000

ExtensionFinchley N3

A 4-metre double-storey side extension to a 1930s semi-detached house, adding a ground-floor utility room and first-floor bedroom with en-suite. Matching brickwork sourced from a specialist supplier.

Full Internal Renovation

£68,000

RenovationHendon NW4

Complete strip-out and refurbishment of a 3-bedroom terraced house, including new kitchen, two bathrooms, rewiring, replumbing, and redecoration throughout. Completed in 9 weeks.

Loft Conversion with Rear Dormer

£52,000

Loft ConversionEast Finchley N2

L-shaped dormer loft conversion creating a master bedroom with en-suite shower room and built-in storage. Steels and structural work completed in 3 days with minimal disruption.

FAQs — Construction in Barnet

How much does a single-storey rear extension cost in Barnet?

A single-storey rear extension in Barnet typically ranges from £45,000 to £85,000 depending on size, specification, and ground conditions. Barnet's clay-heavy soil often requires deeper foundations than average, which can add £3,000–£8,000 to groundwork costs. We provide fully itemised quotes after a free site survey.

Do I need planning permission for a loft conversion in Barnet?

Most dormer loft conversions in Barnet fall under permitted development rights, meaning no planning application is needed — provided the dormer does not exceed 50 cubic metres (40 for terraced houses) and complies with height and setback rules. However, properties in conservation areas like Totteridge Village or Hampstead Garden Suburb will almost certainly need full planning permission. We assess this during our free consultation.

How long does a typical house extension take in Barnet?

A standard single-storey rear extension in Barnet takes 10–14 weeks from breaking ground to completion. Double-storey extensions typically take 16–22 weeks. We provide a fixed timeline in our contract and keep you updated with weekly progress reports.

Can I extend my house in the Hampstead Garden Suburb?

Hampstead Garden Suburb has some of London's strictest planning controls — the entire area is covered by an Article 4 Direction and managed by the Hampstead Garden Suburb Trust. Even minor external changes require consent. We have experience navigating this process and can advise on what is achievable during a free consultation.

Do you handle party wall agreements in Barnet?

Yes. If your extension is built on or near a shared boundary, you will need a Party Wall Agreement under the Party Wall etc. Act 1996. We coordinate the entire process, including appointing surveyors, serving notices, and managing the award timeline — which typically takes 4–6 weeks before construction can begin.

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