Builders in Hammersmith

What Hammersmith houses have in common

Most of the housing stock we work on in W6 falls into three families, and each one points to a different type of project.

• The Brackenbury Village grid. Two-storey Victorian terraces on narrow plots between Goldhawk Road and King Street. The loft and the side-return alley are usually the only places these houses can grow, which is why W6 leads our enquiries for both.
• Ravenscourt Park and its fringes. Larger semis, taller terraces and mansion blocks around the park. More generous roofs make dormers and terraces viable, and flats here often need freeholder consent alongside any council approval.
• The riverside. Georgian and early Victorian houses towards the Thames, many listed or inside tightly drawn conservation areas, where internal reconfiguration and meticulous refurbishment matter more than adding volume.

Knowing which family your house belongs to shapes everything that follows: the realistic scope, the planning route and the budget band. That assessment is exactly what our first visit establishes.

Loft Conversions in Hammersmith

The classic W6 Victorian terrace has a butterfly or shallow-pitched roof and modest headroom, so the honest answer on lofts is usually a choice between two routes. A rear dormer replaces one roof slope with a box structure to create full standing height and is often achievable under permitted development, which allows up to 40 cubic metres of additional roof volume on a terraced house. A mansard rebuilds the roof to a near-vertical profile, gains the most floor area and the best proportions, and almost always requires a full planning application. On many Hammersmith streets the mansard is the established precedent, and matching a neighbour's approved roof is frequently the strongest planning argument available.

Two cautions from experience. First, several W6 conservation areas carry Article 4 directions that remove roof-alteration rights, so never assume permitted development applies until we or your architect have checked your street. Second, butterfly roofs hide their structure: the party parapets and valley need proper engineering before anyone promises you a terrace. Our structural engineers are in-house, so feasibility answers arrive in days rather than weeks. For conversion types, timescales and design options across the city, see our loft conversion service. If you are torn between going up or going out, our comparison of a loft conversion versus a house extension in Hammersmith and Chiswick works through exactly that decision for W6 and W4 houses.

One more W6-specific point: roof terraces. Demand for outdoor space at roof level is higher in Hammersmith than almost anywhere else we work, because gardens on the terraced grid are small and the park views reward height. A terrace changes the engineering brief, since the roof becomes a floor with live loads, balustrades and drainage falls, and it changes the planning brief too, because LBHF will assess overlooking of neighbouring gardens and bedrooms. Designed together from day one, terrace, dormer and stair can share one structural solution instead of three compromises. That integrated approach is precisely what our Ravenscourt Park project demonstrates.

Case study: luxury loft conversion with roof terrace, Hammersmith W6

This is the project we point Hammersmith clients to first, because it shows what a W6 roof can become when structure, planning and craft are handled by one team.

• Location: Hammersmith, by Ravenscourt Park.
• Scope: renovation and extension of the second floor, a new roof terrace, and a full refurbishment of the house below.
• Structure: new roof build-up engineered in-house, with a structural glass detail that connects the floors and pulls daylight into the centre of the house.
• Craft: a custom-made staircase up to the new floor, new timber flooring, redecorated bedrooms and hand-crafted joinery details throughout.
• Result: a principal bedroom that opens onto its own terrace with a view, plus a house-wide refresh rather than a bolted-on extra room.
• Budget band: we do not publish individual clients' accounts, but work of this scope, a bespoke roof extension with terrace plus refurbishment, typically falls within our prime London band of £130,000 to £210,000.

See the photos and the full story at the luxury loft with roof terrace in Hammersmith portfolio page. If you want the roof terrace conversation for your own house, book a free site visit and we will bring the structural questions with us.

House Extensions in Hammersmith

At ground level, the Brackenbury-type terrace has one obvious gift: the side-return alley beside the rear kitchen wing. A side-return infill widens the kitchen-diner across the full plot width and, at standard specification, is the lowest-cost extension type in London, typically £15,000 to £35,000 in build cost. A wrap-around combines the side return with a rear extension into one L-shaped space, typically £50,000 to £95,000, and delivers the biggest ground-floor transformation a W6 terrace can get. At houseUP's specification, with structural glazing, underfloor heating and bespoke kitchens, sensible budgets sit above those standard bands, and we will show you exactly where in an itemised quote.

Design is where these projects are won. The rear of a Victorian terrace faces north or east on many Brackenbury streets, so glazing strategy, roof lights over the infill and the junction with the original wing decide whether the new room feels bright or borrowed. A 3-metre rear addition on an attached house can often proceed under permitted development, while conservation-area status or an Article 4 direction pushes the scheme into a full application. We design to the route that suits your street and your appetite for programme risk. Our house extension page covers the design and build process, from feasibility through to completion.

Planning permission in Hammersmith & Fulham

Your local planning authority in W6 is the London Borough of Hammersmith & Fulham (LBHF), which has designated 44 conservation areas across the borough. Two of them dominate our residential Hammersmith casework:

• Bradmore: the council's name surprises many owners, because this is the conservation area that covers the Brackenbury Village grid; LBHF extended it in October 2014 to take in Brackenbury Gardens and Brackenbury Road. Roofline consistency is taken seriously here, and rear dormers are scrutinised for bulk and materials.
• Ravenscourt & Starch Green: the streets around Ravenscourt Park, a mix of terraces, semis and mansion blocks where context varies street by street.

Inside these areas, expect the council to care about matching brick and slate, the visibility of dormers from the street, and the cumulative effect of roof additions along a terrace. Where an Article 4 direction applies, works that would elsewhere be permitted development need a full application instead. The statutory fees are modest against the project cost: £548 for a householder planning application and £274 for a lawful development certificate, which is the document we recommend obtaining even when no permission is needed, because it proves your extension's legality when you sell. What actually protects your programme is submission quality: precedent research on your street, accurate drawings and a design officers can approve without rounds of amendment. That is the standard our partner RIBA architects work to on every LBHF application.

Party walls: the W6 terrace reality

Almost every Hammersmith terrace project engages the Party Wall etc. Act 1996, usually twice, because a mid-terrace house shares structure with neighbours on both sides. New loft steels bearing on the shared walls, raising a parapet for a mansard, or cutting into the wall for an extension all require formal notice before work starts. Handled early and courteously, this is routine: consenting neighbours cost you nothing, and where surveyors are appointed, budget roughly £1,000 to £2,000 per neighbour. Handled late, it is the single most common cause of stalled start dates in W6. We prepare notices as soon as the structural design is fixed and keep neighbours informed throughout the build, which is also simply good manners on streets as close-knit as Brackenbury's. Our plain-English guide to party wall agreements for loft conversions explains the notices, the timescales and your neighbours' options.

How much does a loft conversion cost in Hammersmith?

These are typical 2026 bands for W6 projects at houseUP's design and build specification, grounded in our completed prime London work rather than directory averages. Every project gets a fixed, itemised quote after a site visit.

Project type in Hammersmith	Typical budget (2026)
Rooflight loft conversion	£28,000 - £50,000
High-specification rear dormer	£90,000 - £160,000
Bespoke mansard or loft with roof terrace	£130,000 - £210,000
Side-return infill (standard spec build cost)	£15,000 - £35,000
Wrap-around extension	£50,000 - £95,000
Full house renovation	from £2,500 per sqm

Three factors move a W6 loft within its band: the structural complexity of the existing roof, the bathroom count, and finish level, since joinery, flooring and glazing choices can swing the total more than the shell itself. Professional fees, party wall costs and any planning fees sit on top. For the full national and London picture, including what drives each band, read our loft conversion cost guide.

Beyond the roof: renovating in Hammersmith and next door

Roughly half of our West London workload is not a loft at all but full renovation: rewiring and replumbing a tired terrace, reworking the layout, and bringing every finish up to one coherent standard. The renovation band in the table above, from £2,500 per sqm, covers that scope at our specification. West London clients often visit our work just over the borough boundary, where we developed the roof of a Bedford Park flat into a Victorian penthouse with a grass roof terrace, media room and sauna. The same team serves both postcodes, and our builders in Chiswick page covers the W4 side of our patch.

Working with houseUP in W6

We are a design and build contractor, which means one accountable team from feasibility to handover: partner RIBA architects for design and planning, our own structural engineers, a quantity surveyor producing itemised estimates, and a dedicated project manager on site. You follow progress, decisions and budget through our digital tools rather than chasing phone calls. We work across Hammersmith and West London from our Covent Garden office, and site visits in W6 are free and without obligation.

A typical Hammersmith loft project runs like this: a site visit and feasibility view in week one, structural and design development over the following month, the LBHF planning or lawful development route in parallel, party wall notices served as soon as the steelwork is fixed, then 6 to 12 weeks on site depending on the roof type. Throughout, you have one project manager, one itemised budget and no gaps between designer, engineer and builder where problems usually hide. Book a free site visit and tell us what your house is not doing for you yet.