GS Renovation builds loft conversions in Parsons Green, on the handsome Victorian terraces around the green and down towards Bishops Park in SW6. Mansards and closet wing dormers are both common here, and which one you can have depends on the conservation area position. We coordinate the engineer, build to the design and manage Hammersmith and Fulham Council building control.
Mansards and dormers on SW6 terraces
The Fulham terrace is tall, narrow and usually has a rear closet wing, so the two realistic options are an L-shaped dormer wrapping the main slope and the wing, or a mansard rebuilding the roof at a steep pitch. The L shape is the better value at roughly £55,000 to £80,000 on indicative London ranges for 2026. A mansard gives more floor area and a better ceiling line but costs roughly £70,000 to £100,000 or more, and it is far more likely to need planning permission.
Ridge height is the first check. Roughly 2.2m to 2.4m from the top of the existing ceiling joists is what allows a comfortable finished room once the new floor build-up and rafter insulation are allowed for. If your house falls short and you want the space anyway, a mansard raises the roof and solves it, which is one reason it appears so often on SW6 streets where the neighbours have already done the same.
What permitted development will not give you
Owners here often ask about a roof terrace off the new bedroom. Permitted development for loft conversions explicitly excludes verandas, balconies and raised platforms, so a terrace cut into the roof needs planning permission from Hammersmith and Fulham Council and is frequently refused on overlooking grounds. A Juliet balcony behind an opening is the usual compromise. The other conditions are matching materials, obscure glazed side windows and nothing forward of the existing roof plane.
Conservation areas around Parsons Green remove permitted development rights altogether, and Article 4 directions can do the same. Building regulations apply either way, covering the protected stair route and fire doors under Part B, the stair under Part K, engineer-sized floor joists on steel beams bearing into the party walls on padstones, and insulation and ventilation. Those bearings make the work notifiable under the Party Wall etc. Act 1996, which you serve as building owner.
- Insulation between and over rafters to Part L
- Ventilation paths kept clear at eaves and ridge
- L-shaped dormers over a rear closet wing
- Water tank removal and conversion to a sealed system
- Protected stair enclosure and fire doors to Part B
Why Choose GS Renovation in Parsons Green
Parsons Green owners choose GS Renovation because SW6 lofts are high value work where the planning position, the structure and the finish all have to be right. We coordinate the engineer and architect, install the steelwork, prepare your party wall notices, run Hammersmith and Fulham building control and finish to the standard the house deserves. Insured, certified, and documented for when you come to sell.
- Honest updates if a date or a detail has to move
- Paperwork and certificates handed over for when you sell
- Dust screens and floor protection in occupied homes
- Free, no-obligation quotations
- Interlinked mains alarms fitted and certified
- Staircase set out to Part K within the space you have