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We design and build Barnes loft conversions across Castelnau, Church Road, Barnes Green - dormer, mansard, L-shape, hip-to-gable and Velux conversions for Victorian villas, Edwardian Semis, Riverside houses, Period Conversions where planning strategy, conservation detailing, structural steel design, Building Control and staircase sequencing need handling properly.
Every loft conversion project in Barnes is designed to respect the Barnes Conservation Area and the character of Victorian villas, Edwardian semis, riverside houses, period conversions. Our in-house RIBA Chartered Architects handle Richmond upon Thames planning applications, our chartered structural engineers specify any load-bearing work, and our directly-employed trades deliver the build under one fixed-price contract. We coordinate Building Control, Party Wall awards where needed, and all certifications through to handover.
Barnes falls within a conservation area, which means visible external alterations require careful design and often full planning permission. Our architects have extensive experience securing approvals in Richmond's conservation areas.
Our loft conversion projects in Barnes are delivered by our in-house team of RIBA architects, structural engineers and specialist tradespeople. Every project is managed under a single fixed-price contract with no hidden costs.
Barnes keeps the feel of a riverside village, and its roofs are scaled to match. Around Barnes Green and Church Road sit period cottages and villas, Glebe Road carries Victorian and Edwardian family houses, and Castelnau runs grand Victorian villas down towards the bridge. On homes of this size a loft is usually a modest affair — a rear dormer, or a run of conservation rooflights that lifts a bedroom into the roof without breaking the village skyline.
The Barnes Conservation Area protects that character around the pond and the river, and Richmond upon Thames examines external change within its conservation areas and applies Article 4 controls, so roof alterations are tested against the local rules before a design is fixed. On the semis and terraces a party-wall award with the attached neighbour forms part of the job, and near the Thames flood resilience and the setting of Barnes Common weigh on the planning picture too.
The London bands give the range: a rooflight or Velux conversion £50,000–£90,000 excluding VAT, a dormer £60,000–£100,000, a hip-to-gable £65,000–£120,000 on a semi with a hip to open up, and a mansard £65,000–£110,000.
Converting a loft turns dead roof space into a proper storey — usually a bedroom suite, office or studio — with the staircase, steelwork, insulation and fire strategy resolved together rather than improvised on site. Steels are engineered before a rafter is cut, the staircase position is fixed early so the floor below keeps its shape, and the whole build runs under one fixed-price contract. The right approach depends on your roof, and we design and build all of the main forms.
Whichever form suits your roof, the scope runs from steel and floor structure through staircase, en-suite plumbing, insulation, fire doors and detection to fitted eaves storage and final decoration.
Six stages, engineered on paper before the roof is touched.
Read the full loft conversion guide for roof-type recommendations, planning tables and the week-by-week programme.
Many dormer and hip-to-gable conversions fall within permitted development, subject to volume allowances of 40 cubic metres on terraced houses and 50 on semis and detached homes — though conservation areas restrict this and flats have no loft PD rights at all. Where new steels bear on a wall shared with a neighbour, the Party Wall etc. Act 1996 requires two months’ notice before work begins, and Building Regulations govern the structure, staircase, insulation and fire safety of every conversion. Our planning guide library explains what applies in your borough.
A loft conversion is a structural project wearing a bedroom’s clothes, and we staff it accordingly. Layouts come from our in-house RIBA Chartered Architects, the steelwork is designed by our own structural engineers, and party wall support comes through RICS surveying at our sister company, Hampstead Chartered Surveyors. Delivery is by our long-standing build teams on a fixed-price JCT contract, insured to £10M for professional indemnity and public liability, with a 12-month defects period and a 10-year workmanship warranty. Enquire before 2pm on a weekday and we will call you back the same day.
Usually a modest one. The period cottages and villas around Barnes Green and Church Road, and the Victorian and Edwardian family houses on Glebe Road, take a rear dormer or a set of conservation rooflights far more comfortably than a large roof addition — enough for a bedroom in the roof without upsetting the village scale.
It does. The Barnes Conservation Area protects the village character around the pond and the river, and Richmond upon Thames scrutinises external change in its conservation areas and applies Article 4 controls — so a roof alteration is checked against those controls before the design is settled.
On London-wide figures a Velux or rooflight conversion is £50,000–£90,000 excluding VAT and a dormer £60,000–£100,000 excluding VAT — the two forms that suit most Barnes houses. The survey and the conservation position tell us early where a given roof lands.
Almost always. Many Barnes homes are semis or terraces, so the loft works up against a shared wall, and a party-wall award with the attached neighbour is part of the process — alongside the rear access, drainage and boundary questions that the survey settles.
Yes, with flood resilience in mind. The grand Victorian villas along Castelnau run down towards the bridge near the Thames, and refurbishment there is designed with riverside flood resilience — a discipline that carries into a loft project on the same houses.
Visit our studio or invite us to survey your home. We’ll assess scope, discuss design possibilities and provide an honest budget framework — completely free.
We survey your property, discuss your vision and provide a clear budget framework.