The 10 extension builders from Google's results for Chiswick, ranked on Google rating, online presence and other factors. Updated 10 September 2026.
on GoogleLondon
Alstruct Ltd provides house extensions, loft conversions and basement conversions for homeowners in Chiswick and West London. Its services also include groundworks, full property renovations and garden landscaping.
020 8080 8240 15B Raven Rd, London E18 1HB
on GoogleLondon
Crest Projects carries out house extensions and loft conversions for clients in London.
020 8088 8281 128a Boston Rd, London W7 2HJ
on GoogleRear Work Shops, Iver
Middlesex Construction Consultants carries out home extensions, loft conversions, basement conversions, and property refurbishments across Chiswick, London, and Buckinghamshire. Based in Iver, the firm handles both domestic and commercial building projects, including GRP roofing and new builds.
07956 268517 85 Thorney Mill Road, Rear Work Shops, Iver SL0 9AH
on GoogleLondon
Tholos Architects designs home extensions and property renovation projects across Chiswick and West London. The firm focuses on updating and extending traditional Victorian, Edwardian, and Georgian houses for modern living.
225 Oxford St, London W1D 2LR
on GoogleLondon
Extending residential properties across London, Pro Ficiency Ltd provides design and construction services for side return, rear, and wraparound home extensions. The team coordinates architects, builders, and interior design consultations to reconfigure living areas.
020 7435 6231 31 Fortune Green Rd, London NW6 1DU
on GoogleChiswick
SKC Services constructs single-storey, double-storey, and wrap-around home extensions alongside loft conversions. Operating in Richmond and West London, including Teddington and Chiswick, the builder creates additional living areas to expand residential properties.
on GoogleChiswick
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.
Chiswick
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.
Chiswick
Design and Build delivers architect-led extension, renovation, and flat refurbishment projects across Chiswick and surrounding conservation areas. The company handles planning applications and structural work under local planning restrictions, including Article 4 directions in Bedford Park and Gunnersbury.
Chiswick
Sha Bespoke manages full house refurbishments, loft additions, and rear extensions for Victorian residential properties in Chiswick. The practice designs open-plan living layouts and handles architectural planning from initial concepts through to construction completion.
In Chiswick, single storey, per m² typically costs £2,200 – £3,100. Labour in Greater London runs 24% 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 chiswick". They are ranked on Google rating, online presence and other factors.
The figures above are Chiswick 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.