The 10 extension builders from Google's results for Portsmouth, 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 GooglePortsmouth
Milwalt Property Services builds house extensions for domestic clients in Portsmouth, Southampton, and Chichester. The team handles projects from initial design through to completion to create extra living space.
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 GoogleHilsea, Portsmouth
Limewood Builders South Limited manages construction projects across Portsmouth and Southampton. The firm works on residential and commercial builds, specialising in house extensions, loft and basement conversions, property refurbishments, and insurance repair work.
07710 929290 144 London Rd, Hilsea, Portsmouth PO2 9DQ
on GooglePortsmouth
Waterlooville Builders constructs rear extensions, structural alterations, garage conversions, and property renovations across Portsmouth, Waterlooville, and Havant. Projects include installing French doors and skylights for modern family spaces.
on GooglePortsmouth
Clillington Carpentry is a carpentry and building firm putting up home extensions for households in Waterlooville, Fareham and the wider Portsmouth area. Jobs range from modest additions to large-scale builds, including kitchen extensions.
on GoogleGosport
Property Extension constructs home additions across Gosport, Fareham, and Portsmouth. The team builds extra bedrooms, kitchen expansions, and larger family rooms for residential properties.
023 9258 1922 23 Westfield Rd, Gosport PO12 3RX
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 GoogleCosham, Portsmouth
Andy Beech at Abeech Builders completes general construction and installation work across Portsmouth. Based in Cosham, the service covers home extensions, fitted kitchens and bathrooms, loft conversions, roofing, and patio construction.
07901 734219 39 Magdala Rd, Cosham, Portsmouth PO6 2QG
Hilsea, Southsea
JD Construction Portsmouth builds house extensions for homeowners in Hilsea, Southsea and the rest of Portsmouth. Projects include kitchen extensions and extra living rooms, with the firm managing each build from start to finish.
07910 386192 Mabe Business Centre, 350-352 London Rd, Hilsea, Southsea PO2 9JY
In Portsmouth, single storey, per m² typically costs £1,900 – £2,600. Labour in Hampshire runs 4% 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 portsmouth". They are ranked on Google rating, online presence and other factors.
The figures above are Portsmouth 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.