In a city where a three bedroom semi regularly sells for over half a million pounds and the cost of stepping up to a four bedroom house adds another £150,000 to £250,000 to the price tag — plus stamp duty, agents, solicitors, and the upheaval — extending the home you already own makes overwhelming financial sense. You invest directly into usable space and property value rather than handing tens of thousands to intermediaries, and you keep the location, the schools, the neighbours, and the character of a property you chose for good reasons.
We design and build house extensions across St Albans and the surrounding Hertfordshire area, managing every stage from initial concepts and planning applications through to construction and finishing. Single storey rears that open onto the garden, double storey additions providing bedrooms above and living space below, side returns that widen narrow ground floors on Fleetville’s terraces, and wrap-around designs that maximise every available metre — we build them all and coordinate every trade involved.
One team from the first foundation trench to the final coat of paint, with clear communication and transparent pricing throughout. Contact us to discuss how an extension could transform your St Albans home.
The most popular project we build across St Albans — and the one that makes the most dramatic difference to how the ground floor works. A single storey rear extension creates the space for a generous kitchen-diner, an expanded living area, a home office, or a ground floor bedroom without the cost or complexity of building upward. Under permitted development, you can typically extend three metres from the original rear wall for attached houses or four metres for detached without planning permission. Larger extensions up to six or eight metres are achievable through the prior approval process. We design single storey extensions that flood with natural light through bi-fold doors and skylights, connecting interior with garden. Fleetville’s terraces, Marshalswick’s semis, and the family housing across Jersey Farm all respond exceptionally well to this treatment.
When you need space on both floors, a double storey extension delivers the most room for your investment. Building two storeys shares foundations, walls, and roof structure across both levels, costing significantly less per square metre than constructing the equivalent area as separate single storey projects. The ground floor typically provides the enlarged kitchen-diner or living space while the first floor adds bedrooms, bathrooms, or an ensuite above. Double storey extensions in St Albans require planning permission through St Albans City and District Council. The city’s conservation areas and established residential streetscapes mean design quality matters particularly — the extension needs to complement the existing property in materials, proportions, and roofline. We design double storey additions that look like they were always part of the house.
Many of St Albans’ Victorian and Edwardian properties — particularly the terraces and semis through Fleetville and the older streets around the city centre — have narrow side passages running alongside the house that serve no practical purpose beyond storing bins and catching leaves. Extending into this unused strip adds valuable width to the ground floor without consuming any garden space. A side return transforms a cramped galley kitchen into a room with genuine space to cook, eat, and spend time in. Combined with a modest rear extension, the side return creates a wrap-around design that maximises the ground floor footprint in one coordinated project. We design side return extensions that maintain natural light to existing rooms while creating the widest possible gain from the available passage.
The kitchen-diner extension is the single most requested project we build across St Albans. It combines a rear extension with removal of the internal wall between kitchen and dining room, creating one generous open-plan space for cooking, eating, and family life. The result transforms the ground floor fundamentally — a bright, sociable room with space for a properly designed kitchen, a dining table that seats the whole family, and often a seating area, all flowing together and opening onto the garden through bi-fold or sliding doors. We coordinate the structural steelwork for the removed wall, the kitchen fitting, flooring, and all finishing trades to deliver a completed room rather than a shell. St Albans’ housing stock — from Fleetville terraces to Marshalswick semis — consistently produces exceptional kitchen-diner transformations.
We bring experience across St Albans’ varied housing stock to every project. The Victorian and Edwardian construction through the older streets. The inter-war methods across Marshalswick. The conservation area requirements across much of the city. Each property type and each planning context demands specific knowledge that comes from working across all of them consistently.
Our quotes specify every element — groundwork, materials, steelwork, scaffolding, building control fees, and all finishing. Transparent pricing with no hidden costs.
We build extensions throughout St Albans, covering the city centre, Fleetville, Marshalswick, New Greens, Jersey Farm, Bernards Heath, Sopwell, Townsend, London Colney, Redbourn, Harpenden, and surrounding areas.
We provide detailed, itemised quotes specifying exactly what’s included — groundwork, materials, labour, steelwork, scaffolding, building control fees, and all finishing. You know the cost before we start, and if anything changes during the build we discuss it openly before proceeding.
We build house extensions throughout Milton Keynes and the surrounding area, covering Bletchley, Wolverton, Stony Stratford, Bradwell, Two Mile Ash, Shenley, Emerson Valley, Furzton, Westcroft, Kingsmead, Oldbrook, Campbell Park, Newport Pagnell, Olney, Woburn Sands, and surrounding areas.
If you need separate dedicated space rather than additional rooms within the house, a garden room provides it without altering the main building. We build bespoke insulated garden rooms across St Albans with quality cladding, generous glazing, built-in heating, and professional electrics. A garden room and an extension serve different purposes — one creates space apart from the home, the other creates space within it. For St Albans’ commuter population, combining an extension for family living with a garden office for working delivers the best of both approaches.
If you need space upward rather than outward, a loft conversion adds a full additional room without extending your footprint or losing garden. We deliver Velux, rear dormer, and hip-to-gable conversions across St Albans, coordinating steelwork, insulation, staircase construction, electrics, plumbing, and finishing. The inter-war housing across Marshalswick and New Greens features hipped roofs ideally suited to hip-to-gable conversions. A loft conversion paired with a ground floor extension transforms a standard three bedroom house into a spacious five bedroom family home — one team managing both projects keeps the build efficient.
If your extension includes a new kitchen — and most do — we handle the entire installation as part of the build. Our service covers strip-out, structural work, plastering, plumbing, electrics, tiling, flooring, and precision fitting from any supplier. We also deliver complete bathroom renovations including suite replacements, wet room conversions, and ensuite creations. Having the same team manage both the extension construction and the kitchen or bathroom fitting means seamless coordination with no gaps between structural work and interior finishing — one programme delivering a completed room.
Planning an extension in St Albans? Contact us today for a free, no-obligation quote from experienced local builders.