The 10 extension builders from Google's results for Southampton, ranked on Google rating, online presence and other factors. Updated 10 September 2026.
on GoogleWaterlooville
Technical planning and extension drawings are provided by MCA Design for residential and commercial construction projects. Based in Waterlooville, the practice develops structural blueprints for clients in the surrounding regions.
023 9298 4788 33 Sapphire Ridge, Waterlooville PO7 8NY
on GoogleSouthampton
MS Interiors & Building Ltd delivers house extensions, garage conversions, and general building work across Southampton and Hampshire. The team also installs double glazing, kitchens, and bathrooms.
023 8032 4861 68a Oakley Rd, Southampton SO16 4LG
on GoogleKimbell Rd, Basingstoke
Brackenwood installs uPVC and aluminium replacement windows, doors, and conservatories across Portsmouth and Basingstoke. The firm provides double and triple glazing services for residential properties.
0800 253 545 Brackenwood House, Kimbell Rd, Basingstoke RG22 4AT
on GoogleFareham
Solent Builders supplies home extension and building services in Fareham, Southampton, and across Hampshire. Its team handles residential construction, new builds, and design work for local homeowners.
01329 662755 227a West St, Fareham PO16 0HZ
on GoogleBlackbrook Rd, Fareham
Novaseal designs and constructs property extensions for householders in Fareham and Southampton. The business provides modern, secure residential extensions to expand living space.
01329 233500 Unit 1, Blackbrook Business Park, Blackbrook Rd, Fareham PO15 5DR
on GoogleSouthampton
Rob Watkins provides building contractor services throughout Southampton, covering house extensions, loft conversions, and new build projects. The team handles full architectural planning, design, and project management for residential renovations.
Southampton
Made-to-measure house extensions, doors, and window systems are fitted by Conservatory Village in Southampton. The firm installs structural additions that connect indoor spaces directly with outdoor areas.
Southampton
House Extensions Southampton builds property extensions for homeowners in Southampton and the surrounding areas. Its team constructs additional bedrooms, home offices, and enlarged living spaces to adapt houses to changing needs.
Hilsea, Portsmouth
South co Ast Groundworks provides extension building services in Hilsea, Portsmouth.
0808 501 3597 Airport Service Rd, Hilsea, Portsmouth PO3 5PJ
Southampton
M.G. Webber Building & Construction delivers single-storey and double-storey home extensions in Southampton and Romsey. The firm manages every phase of the construction process, from initial groundworks to completion.
In Southampton, single storey, per m² typically costs £1,900 – £2,600. Labour in Hampshire runs 5% 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 southampton". They are ranked on Google rating, online presence and other factors.
The figures above are Southampton 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.