The 10 extension builders from Google's results for North London, ranked on Google rating, online presence and other factors. Updated 10 September 2026.
on GoogleLondon
Paytearchitects London handles loft conversions and home extensions across London. The practice designs structural additions, incorporating features such as mezzanines, skylights, and dormers while managing building regulations and planning permissions.
020 3984 8501 10 Shepherds Bush Rd, London W6 7PJ
on GooglePotters Bar
Jmbdesign and Build provides construction and design services for house extensions across Potters Bar, St Albans, and Hertfordshire.
01707 242892 14 The Service Rd, Potters Bar EN6 1JH
on GoogleLondon
The White Interior designs rear extensions, side-return additions and loft conversions in North London areas including Hampstead, Highgate and Islington. Services focus on reconfiguring period properties to incorporate modern home layouts.
07492 818817 169 Kiln Pl, London NW5 4AP
on GoogleLondon
Studio Manifest completes rear extensions, loft conversions and full renovations for Victorian terraced homes in Islington and North London. Projects include structural alterations and thermal upgrade packages to modernise existing residential spaces.
020 3375 6511 93 Newington Causeway, London SE1 6BN
on GooglePopes Dr, London
LCCL Construction is a design and build company converting lofts, extending houses and renovating homes across East London. It works in areas such as Hackney, Walthamstow, Leyton and Bow, where much of the housing is Victorian terraces, and provides architectural design as part of its service.
020 8037 7332 3rd Floor, Hathaway House, Popes Dr, London N3 1QF
on GoogleAbridge, London
Nilo Construction builds home extensions across North and West London. The firm constructs rear, side, and double-storey additions to create extra living space for residential properties.
07539 757211 1 Church Ln, Abridge, London RM4 1AH
on GoogleBelsize Park, London
XUL Architecture plans and designs rear house extensions for residential properties in Belsize Park and North London. The practice focuses on incorporating natural light into extended living spaces and resolving structural layout challenges.
020 7431 9014 33 Belsize Ln, Belsize Park, London NW3 5AS
on GoogleRomford
KPD Construction builds loft conversions, house extensions, flat conversions, and new builds across East, North, and Central London, as well as Essex. Services also include kitchen renovations and full property refurbishments.
07825 788773 8 Melbourne Gardens, Romford RM6 6TA
on GoogleNorth London
Simply Extend builds house and kitchen extensions across East and South London, covering areas such as Croydon, Lambeth and Wandsworth. The business manages residential builds through assigned project managers, handling groundworks, brickwork construction, plastering and internal fittings.
North London
Plus Rooms provides house and kitchen extension services to homeowners in Richmond-upon-Thames and across South West London. The company manages projects from design through to construction, handling planning regulatory requirements along the way. Its team also builds loft conversions.
In North London, single storey, per m² typically costs £2,100 – £3,000. Labour in Greater London runs 18% above the UK median, which accounts for most of the difference from the same job elsewhere.
These are the firms from Google's results for "house extensions north london". They are ranked on Google rating, online presence and other factors.
The figures above are North London ranges. These explain what drives them, so you can read a quote properly.
Per-square-metre prices for single-storey, two-storey, side return and kitchen extensions, costs by size, the fees outside the build price, and planning limits by nation.
The permitted development limits for extensions, lofts, porches and outbuildings in England, where the rights do not apply, what prior approval and a certificate cost, and how Wales, Scotland and NI differ.
When the Party Wall Act applies, which notice to serve and how far ahead, what your neighbour can do, what a surveyor's award costs, and the rules in Scotland and NI.
Under permitted development, three metres for a terrace or semi and four for a detached, doubled to six and eight under the prior approval process. Height, materials and how much garden you cover all carry separate limits, and none of it applies in a conservation area.
If you are excavating within three metres of a neighbour's foundations or building on the boundary, yes. You must serve notice two months before work starts. Skipping it is the most common reason extension projects stall.