Wraparound Extension Drawings in Brook Green W6
Fixed-fee, MCIAT-chartered wraparound extension drawings for Brook Green (W6) homeowners — London Borough of Hammersmith & Fulham validation and local constraints handled from the start.
Brook Green in W6 is a sought-after enclave of large Victorian terraces and Edwardian mansion blocks in the green space between Hammersmith and Kensington. Families here typically extend at the rear or into the side return, convert generous lofts, or reconfigure mansion flats, so most of our drawings support space-making projects on characterful period homes.
The Brook Green conservation area and neighbouring designations mean roof alterations, front elevations and materials are all assessed against a strikingly consistent streetscape. We detail schemes to sit comfortably within that grain and present them the way Hammersmith and Fulham's officers expect, which keeps sensitive extensions and loft conversions moving smoothly towards approval.
Planning in Brook Green (W6): what to know before you apply
There is no published householder Article 4 direction we depend on for Brook Green, but the Brook Green conservation area constrains permitted development on roofs and principal elevations. Matching red-brick detail, respecting the scale of the terraces, and checking for protected street trees are the usual design limits on rear and roof works.
Typical Brook Green housing stock
Brook Green is a leafy pocket of large Victorian terraces and red-brick Edwardian mansion blocks set between Hammersmith and Kensington. The generous houses lend themselves to full-width rear extensions, side returns and loft conversions, while the mansion blocks generate careful internal reconfigurations and flat conversions that suit family life in W6.
Streets we regularly draw for in Brook Green
Yeldham Road · Winslow Road · Sussex Place · Playfair Street
What W6 is actually built of
Measured from 388 classified residential buildings in W6, not from a description of the area.
Brook Green W6 housing mix
Residential building form across the W6 postcode district, from 388 classified buildings.
| Attached on more than one side | 80% |
|---|---|
| Attached on one side | 17% |
| Detached | 3% |
| Median building footprint | 63 m² |
| Addresses per buildingAbove about 2 means flats and maisonettes dominate | 2.68 |
| Buildings classified | 388 |
Source: Ordnance Survey National Geographic Database (derived statistics). Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Extracted 2026-08-17.
Wraparound Extension Drawings for Brook Green (W6) homes: the package and the process
A wraparound is assessed as one addition, so the drawings have to present it as one: a single proposed footprint with the rear depth and the side width both dimensioned, the roof drawn as it turns the corner, and the remaining garden shown on the site plan.
The corner is where the technical work sits. Two roof planes and two structural spans meet at the return, drainage has to get round it, and the internal opening is usually wide enough to need a designed frame rather than a single beam. We resolve that junction on the drawings before it becomes a question on site.
A wraparound needs both a rear garden and a side alley, which in practice means a terrace or end-of-terrace with an outrigger. Where only one of the two exists, the honest answer is a rear extension or a side return — the combined footprint has nowhere to turn the corner.
What makes a wraparound extension different from a rear or side return alone?
A rear extension adds depth at the back of the house; a side return adds width down the alley; a wraparound does both at once, so the new floor area turns the corner of the original building rather than sitting against just one wall. The result is typically the largest open-plan space a single-storey extension can deliver, but it also means more of the original external wall is removed and more of the roof is new, which raises the structural and drainage stakes compared with either extension on its own. Homeowners who start out planning a rear extension or a side return alone often move to a wraparound once they see how little extra it costs to combine the two, since much of the groundwork, roof structure and glazing is shared between them rather than duplicated.
Do wraparound extensions need full planning permission in London?
Almost always, yes. Permitted development allowances are calculated on combined additions to the original house, and a wraparound's depth plus width together generally exceed the volume and footprint limits that apply to a rear extension or side extension considered separately. A Lawful Development Certificate route is rarely viable for a genuine wraparound.
Conservation area status and Article 4 directions, common across the terraced streets where wraparound extensions are most popular, remove permitted development rights further still, so we design every wraparound on the assumption it will go through full householder planning.
Structural design for a wraparound extension
Because the new space turns a corner, the structural frame has to work as one continuous system rather than two independent extensions bolted together.
- A continuous steel or ring-beam frame carrying the roof around the internal corner where the rear and side elements meet
- A glazed roof lantern or rooflight strip often placed at the corner junction, where natural light reaches deepest into the combined plan
- Foundations for both the rear and side elements designed together, so they tie into the existing house consistently
- Bi-fold or sliding doors across the rear elevation, coordinated with the side glazing so the two elements read as one space
| Route | What it covers | Typical fee |
|---|---|---|
| Full planning permission | Required for almost all wraparound extensions given the combined footprint | Full Planning pack ~£1,600–£2,400 |
| Planning + Building Regulations (structural) | Combined pack including structural calculations for the L-shaped frame and drainage diversion | Planning + Building Regs pack ~£2,200–£3,850 |
| Rear extension alone (comparison) | Smaller single-storey addition, may qualify for permitted development | see Rear Extension Drawings, from £1,100 |
| Side return alone (comparison) | Widens the kitchen only, keeps garden depth unchanged | see Side Return Extension Drawings, from £1,400 |
Wraparound Extension Drawings in Brook Green W6 — FAQs
How much does a wraparound extension cost to design in London?+
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