The 10 extension builders from Google's results for St Albans, ranked on Google rating, online presence and other factors. Updated 10 September 2026.
on GoogleSt Albans
St Albans Builders carries out construction projects for homeowners across the local community. The company handles home extensions, loft conversions, and general building work in and around St Albans.
01727 637183 Arquen House, 4-6 Spicer St, St Albans AL3 4PQ
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 GooglePorters Wood, St Albans
Eagle Design and Build provides residential construction services across St Albans. Its work spans architectural design through to building completion, including loft conversions, house extensions, and interior refurbishments.
01727 743829 Long Spring, Porters Wood, St Albans AL3 6EN
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 GoogleSt Albans
Hbgeneral Builders designs and constructs home additions across St Albans and Hertfordshire, including open-plan kitchens, light-filled garden rooms, and additional bedrooms. Its team also carries out loft and barn conversions.
on GoogleCuffley, Potters Bar
Abbey Extensions designs and builds home extensions, garden rooms, and loft conversions across Cuffley, Potters Bar, and East London. The firm manages full property renovations to expand and update residential spaces.
Cuffley Place, Sopers Rd, Cuffley, Potters Bar EN6 4SG
on GoogleVictoria St, St Albans
Building single and double-storey extensions across St Albans and Harpenden, Herts Home Extensions constructs extra living space for residential properties. The company also undertakes loft conversions, full house refurbishments and complete new build homes.
01727 881722 victoria Square, Victoria St, St Albans AL1 3TF
on GoogleLondon Rd, St Albans
St Albans Basement constructs house extensions designed to enlarge living areas and maintain structural integrity. Located in the St Albans area, the company handles projects including single-storey extensions for homeowners looking to alter their properties.
01727 323411 3a, Canberra House, London Rd, St Albans AL1 1LE
on GoogleLondon
House Extension Tips provides architectural design guidance for residential extensions across St Albans and London. The business assists property owners with planning considerations for expanding their living spaces to suit remote working and changing home requirements.
020 7686 3445 4.01, The Tea Bldg, 56 Shoreditch High Street Soho Works, London E1 6JJ
St Albans
Acs Construction Services carries out a wide range of residential building projects throughout St Albans and nearby areas. Its capabilities cover house and kitchen extensions, loft and garage conversions, bathroom renovations and structural home foundations.
In St Albans, single storey, per m² typically costs £2,100 – £2,900. Labour in Hertfordshire runs 16% 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 st albans". They are ranked on Google rating, online presence and other factors.
The figures above are St Albans 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.