GS Renovation designs and builds extensions across Barnet, adding space to the 1930s semis and interwar suburban houses that fill Finchley, Mill Hill and Edgware. With over 30 years working across EN4, EN5, N3, N12 and NW7, we handle foundations, steelwork, roofing and the full fit-out, and guide you through permitted development or a planning application to Barnet Council.
Rear and side-return extensions in Barnet
Barnet's interwar semis were built on generous plots with side access down one flank, which makes them well suited to side-return and wrap-around extensions as well as the more common single and double storey rear additions. Opening the kitchen into a new rear extension is the most popular project we build across Finchley, Hendon and Mill Hill, creating the open-plan kitchen-diner that these 1930s layouts naturally lack.
Every extension starts with proper groundworks. We dig and pour foundations to suit the ground conditions and any nearby trees, common on the leafy plots around Mill Hill and Hadley Common, then build up in blockwork or brick to match the existing house. Steel beams tie the new opening to the old structure, and we complete the roof, glazing, insulation, plastering, electrics and decoration as one continuous job.
Permitted development or planning in Barnet
Many single storey rear extensions on Barnet semis fall under permitted development, but this is not guaranteed. Larger builds, most double storey extensions, and any work to the front usually need a full planning application to Barnet Council. Homes within Hampstead Garden Suburb, a designated conservation area, face tighter controls, and some streets carry Article 4 directions that remove permitted development rights entirely.
We assess your property early and tell you honestly which route applies, then prepare drawings and manage the submission. Separately, the build must meet building regulations, with inspections at foundations, damp course, steelwork and completion. Where the extension sits near the boundary you share with a neighbour, party wall notices under the 1996 Act apply, and we build the notice period into the programme so nothing stalls on site.
- Full fit-out, finishing and making good
- Architectural drawings and structural coordination
- Single and double storey extensions
- Side-return and rear extensions
- Wrap-around extensions and infills
Why Choose GS Renovation in Barnet
Barnet homeowners choose GS Renovation because one team takes the extension from first drawings to final decoration, including foundations, steel, roofing and services. We know how the borough's interwar plots behave, how Barnet Council handles planning, and where conservation and Article 4 rules bite. Thirty-plus years of local building means realistic timescales and no nasty surprises.
- Free, no-obligation quotations
- Over 30 years of hands-on experience
- Dedicated project management
- Fully insured and guaranteed work
- Building control and planning support
- Clean, tidy and reliable tradespeople