Loft Conversions in Fulham SW6: L-Shaped Dormers on the Victorian Terraces, Conservation Areas, Hammersmith and Fulham's Planning Record and Prices
By Anderson & the LCCL Construction Team | Finchley N3
Fulham SW6 is the most consistent housing in west London: street after street of two-storey Victorian terraces built between 1880 and 1910, with a two-storey rear outrigger holding the kitchen and bathroom and a small garden behind. The Peterborough estate, Parsons Green, Hurlingham, the roads off Munster Road and Fulham Palace Road are all variations on the same house, and much of the postcode sits in one of Hammersmith and Fulham's conservation areas. The outrigger decides the loft; the conservation area decides the route.
As LABC Building Excellence Award Winners 2024 for Best Residential Extension in London — and London Regional Winner 2026 for Best Conversion or Alteration to an Existing Home — we design and build lofts across Fulham and Chelsea: the loft and rear extension on a terrace in Fulham SW10 and the rear extension with a basement on a Fulham SW6 terrace are both ours, and they are described below. The bedroom in the photograph is the same L-shaped loft on a terrace in West Ealing.
Not sure whether your project needs planning permission? Enter your postcode and tick what you want to build — about two minutes, free, and the from-price for each part that qualifies appears on screen and in your inbox.
The Fulham house and the loft that suits it
On a terrace with a two-storey outrigger the loft that makes sense is the L-shaped dormer: a full-width dormer across the main roof and a second along the outrigger roof, joined at the corner, giving two rooms rather than one — usually a double bedroom with an en-suite and a second bedroom or study, 30 to 40 square metres in all. A plain rear dormer across the main roof only gives one room of 20 to 30 square metres for less money and less time. On the taller houses towards the river a rooflight loft fits a bedroom under the existing slopes with no change to the roof at all, and where the ridge is low — some of the smaller cottages near the Lillie Road — a mansard is the only loft that gives standing headroom, and it always needs a planning application.
Is a loft conversion permitted development in Fulham?
Outside the conservation areas, usually. A loft on a house (not a flat) is permitted development where the new roof space stays within 40 cubic metres on a terrace, no dormer faces the road, nothing rises above the existing ridge, the materials match the house, side-facing windows are obscure-glazed and the dormer sits at least 200 mm back from the eaves. The allowance is a volume, not a floor area, and any previous roof extension counts against it; an L-shaped dormer on a Fulham terrace usually fits but a large one can exceed it. We apply to Hammersmith and Fulham for a Lawful Development Certificate (£274, up to eight weeks) so the position is confirmed in writing before work starts.
Inside a conservation area — Parsons Green, Hurlingham, Moore Park, Fulham Reach, the Peterborough estate and several more cover much of SW6 — the dormer rights fall away and a loft that changes the roof shape needs a householder planning application (£548, eight weeks); a rooflight loft usually remains permitted development. The borough's record is worth knowing: in the year to June 2026 Hammersmith and Fulham approved 98 per cent of householder applications, the highest rate in London, but agreed an extension of time on 65 per cent of them, the highest share anywhere. In practice a Fulham loft application is very likely to be approved and quite likely to take longer than eight weeks. Our Planning check reads the conservation-area and Article 4 data for your postcode before it gives an answer; the council has the final say on any application.
Not sure whether your project needs planning permission? Enter your postcode and tick what you want to build — about two minutes, free, and the from-price for each part that qualifies appears on screen and in your inbox.
Building control in Hammersmith and Fulham
Building regulations apply to every loft whatever the planning route. The council's building control team or an approved inspector sees the new floor structure and steel beams before they are covered, the staircase and headroom, the fire-protected route from the loft to the front door with fire doors on the rooms that open onto it, the insulation and ventilation of the new roof, and the completed loft before the completion certificate is issued. On a terrace both party walls carry steel, so notices under the Party Wall Act go to both neighbours. Our structural engineer produces the calculations for the beams and the new floor, and the drawings go to building control before the scaffold goes up.
What a loft conversion costs in Fulham
Velux / rooflight loft: from £32,400 inc. VAT (£27,000 + VAT), 15–25 m², four to six weeks on site.
Rear dormer: from £56,400 inc. VAT (£47,000 + VAT), 20–30 m², six to eight weeks on site.
L-shaped dormer: from £58,800 inc. VAT (£49,000 + VAT), 30–40 m², eight to ten weeks on site.
Mansard: from £76,800 inc. VAT (£64,000 + VAT), 30–45 m², ten to fourteen weeks on site, planning application always required.
Every figure is design and build at economy specification, shell-and-plaster finish, and includes the survey, the drawings, the structural calculations, building control and a 12-month workmanship guarantee, with a 10-year LABC structural warranty on every project. The final price is fixed in writing after the survey and is postcode dependent. A loft built together with a rear or side-return extension starts from £98,400 inc. VAT (£82,000 + VAT) under one contract.
Our Fulham projects: SW10 and SW6
On a terraced house in Fulham SW10 we designed and built a loft conversion and a rear extension as one programme: the scaffold went up, the rear roof came off with the front roof supported, steel beams and new timbers formed the loft, and the result was a large double bedroom with a separate bathroom. On the ground floor the rear extension and two steels opened the back of the house into one kitchen, dining and living space. On a Fulham SW6 terrace the brief was a rear extension with a basement beneath it: frameless doors opening flush onto the patio, a large skylight over the kitchen with integrated lighting and speakers, two lightwells bringing daylight into the lower floor, and a Scandinavian palette of greys and rose gold the client had asked for. Between them the two projects cover what a Fulham terrace can become — a loft above, an open ground floor, and the basement below when the garden allows.
Anderson's advice
In Hammersmith and Fulham, pay for the pre-application advice. The borough's own figures show why: it approves almost everything, but two applications in three go past the eight weeks under an agreed extension while the officer asks for a drawing to change. A pre-application conversation tells you what that change will be before you submit, so the application goes in right first time and the decision arrives inside the statutory period. Our team has found pre-app advice in some boroughs more useful than in others — Wandsworth's is the model — and in this borough it is the difference between a loft that starts in spring and one that starts in summer. The council has the final say either way.
Why Fulham homeowners choose LCCL
One contract and one point of contact: our team surveys the roof, draws the loft to the permitted development limits or to the conservation officer's requirements, runs the pre-application enquiry and the Lawful Development Certificate or the planning application, produces the structural calculations, serves the party wall notices, deals with building control and builds the loft with the same site team from scaffold to completion certificate. Clients see one price, one programme and one person to call.
What our clients say
“LCCL Construction were very professional throughout our loft conversion. Alex and his team are very responsive, easy to contact and very knowledgeable. LCCL made the process very straightforward and nothing was too much trouble. Alex has a wealth of experience and his team of trades people (carpentry, roofing, electrics, pluming, tiling, painting) are highly skilled and experienced.”
— Declan Furey, Google Reviews
Frequently asked questions
Do I need planning permission for a loft conversion in Fulham?
Outside the conservation areas, usually not: an L-shaped or rear dormer within the 40 cubic metre allowance on a terrace, with no dormer facing the road, is permitted development and we confirm it with a Lawful Development Certificate from Hammersmith and Fulham. Inside a conservation area such as Parsons Green or Hurlingham a dormer needs a householder planning application, and a mansard always does; the council approved 98 per cent of householder applications in the year to June 2026 and has the final say.
How much does a loft conversion cost in Fulham?
From £32,400 inc. VAT (£27,000 + VAT) for a rooflight loft, £56,400 inc. VAT (£47,000 + VAT) for a rear dormer, £58,800 inc. VAT (£49,000 + VAT) for an L-shaped dormer and £76,800 inc. VAT (£64,000 + VAT) for a mansard, design and build at economy specification. The final figure follows the survey and the drawings.
Which loft conversion suits a Fulham terrace?
An L-shaped dormer: a full-width dormer across the main roof joined to a second over the rear outrigger gives two rooms — usually a double bedroom with an en-suite and a second bedroom or study — and on most Fulham terraces it fits inside the 40 cubic metre permitted development allowance. Where the ridge is too low for headroom, a mansard with a planning application is the alternative.
Get a figure for your own project
Not sure whether your project needs planning permission? Enter your postcode and tick what you want to build — about two minutes, free, and the from-price for each part that qualifies appears on screen and in your inbox.
To book a free 30-minute consultation call about your Fulham loft conversion, call LCCL Construction on 020 8037 7332 or get an instant estimate at https://www.lcclconstruction.co.uk/instant-quote.
One team, one contract, one point of contact — from first sketch to handover.
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