Wraparound Extension Drawings in Chiswick W4
Fixed-fee, MCIAT-chartered wraparound extension drawings for Chiswick (W4) homeowners — London Borough of Hounslow validation and local constraints handled from the start.
Chiswick (W4) sits in Hounslow, and its housing is mostly late-Victorian and Edwardian terraces and semis on the grid between Chiswick High Road and the Thames. These are houses with real rear-garden depth, which is why side-return and wraparound extensions are the recurring project here rather than the basement digs common further into central London.
The designation picture is unusual for a suburban-feeling district. Hounslow operates a borough-wide Article 4 direction removing the right to convert a house to a small HMO, so an HMO scheme anywhere in W4 needs a full application — the direction is not tied to any conservation area. A second direction removes permitted development rights for changes of use creating new dwellings under Class MA/ZA. On top of that, the Chiswick House and Turnham Green conservation areas protect the historic parkland setting and the Victorian frontages respectively. We establish which of those apply to an address before drawing to Hounslow's guidance.
Planning in Chiswick (W4): what to know before you apply
W4 falls under Hounslow's borough-wide Article 4 direction removing the right to convert a dwellinghouse (C3) to a small HMO (C4), so HMO conversions need a full planning application regardless of where in the district they sit. A further direction removes permitted development rights for changes of use that would result in new dwellings (Class MA/ZA). Two conservation areas apply — Chiswick House, protecting the historic parkland setting, and Turnham Green, protecting the Victorian street frontages. The district's deep rear gardens make side-return and wraparound extensions the common project type.
Typical Chiswick housing stock
Late-Victorian and Edwardian terraces and semi-detached houses on the grid of streets between Chiswick High Road and the river, with generous rear gardens and original bay frontages, set around the historic parkland of Chiswick House.
Streets we regularly draw for in Chiswick
Chiswick High Road · Devonshire Road · Grove Park Road · Duke Road
Wraparound Extension Drawings for Chiswick (W4) homes: the package and the process
Every wraparound extension drawings we prepare for an Chiswick property is drawn to London Borough of Hounslow’s validation standards and tuned to the W4 constraints above. Here is what the drawing package covers and how the process runs from first survey to approval.
A wraparound extension is what happens when a rear extension and a side return are designed together rather than as two separate projects: the new build wraps around the back corner of the house, turning a galley kitchen and a small rear room into one continuous kitchen, dining and living space running the full width of the plot. It is the most ambitious single-storey option most London terraces and semi-detached houses have, and because it reshapes almost the entire ground floor, it needs careful structural and drainage planning as well as a confident planning application.
DrawingsDirect draws wraparound extensions for full planning and building regulations, with structural calculations for the L-shaped frame and any drainage diversion produced in-house by our MCIAT-chartered team, on a fixed fee. If your project is a single-storey rear addition or a side infill on its own, see our Rear Extension and Side Return Extension pages; if you also want a second storey, see Double Storey Extension Drawings.
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.
| 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 Chiswick W4 — FAQs
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