House Extensions
Rear, side-return and wrap extensions ideal for Barnet plots.
Typical timeline: 6–12 weeks
Recent work near Barnet
These are real Forge Build projects in London. Click to view full details on our projects page.
Barnet • Finchley • Mill Hill
Fully managed design & build for North London homeowners. Fixed-price quotes, accredited trades and 10-year workmanship warranty.
Planning & Building Control for Barnet Council handled
Ideal for rear extensions, dormers, mansards & full-house upgrades
Tell us your postcode and what you want to build — we’ll call you back.
Extensions, lofts and full refurbishments for family homes in Barnet, Finchley, Mill Hill, Totteridge, Whetstone and the wider borough.
Rear, side-return and wrap extensions ideal for Barnet plots.
Typical timeline: 6–12 weeks
Dormer, mansard and hip-to-gable lofts to add bedrooms or a master suite.
Typical timeline: 6–10 weeks
Top-to-bottom modernisations for dated Barnet homes.
Includes MEP upgrades & finishes
We visit, measure and advise on planning routes.
Book a visitYou want a North London builder who has actually dealt with Barnet Council, can give you a real programme, and won’t change the price halfway. That’s how we work.
*Final pricing confirmed after site visit & design pack.
These are real Forge Build projects in London. Click to view full details on our projects page.
Yes. We prepare drawings, structural calculations and submit to Barnet Council. Where permitted development applies, we’ll tell you and fast-track.
Yes. After survey you’ll receive a fixed-price proposal with a clear programme and payment milestones.
We cover the whole borough: High Barnet, Friern Barnet, New Barnet, Finchley, Mill Hill, Totteridge, Whetstone, NW7, EN4–EN5 and nearby North London postcodes.
We also work across these London areas:
Not sure if we cover your street? Call us to check: 020 3355 6146
