L-shaped wraparound drawings for Hounslow — a full-width rear extension married to the side-return infill so the whole ground floor opens up, drawn to Hounslow Council's guidance, delivered in days and revised free until your decision, with a free approval-odds check first.
Hounslow Council granted 86% of the householder planning decisions it made in its latest published year — 1 point below the 87% England-wide householder average. Side-return and mansard schemes dominate in Chiswick, where officers weigh roof bulk against a strongly uniform terrace roofscape, which is where a policy-literate drawing pack earns its keep. Its dominant Georgian (1714–1837), Victorian (1837–1901), Edwardian (1901–1910), interwar (1918–1939) and postwar (1945–1970) housing stock sets the design brief on most streets.
The permitted-development ceilings are fixed: 40m³ of new roof volume for a terraced loft and 50m³ for a semi or detached house under Class B, plus a 3m single-storey rear extension on a terrace or 4m on a detached house under Class A. Hounslow carries at least one Article 4 direction, and conservation areas including Bedford Park, Old Chiswick and Strand-on-the-Green remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Hounslow is determined against an 8-week statutory target.
Chiswick (Victorian and Edwardian terraces wrapped around the Bedford Park garden suburb), Brentford (older riverside terraces alongside recent waterfront redevelopment), Isleworth (the Old Isleworth riverside conservation area and Georgian frontages), Osterley (interwar semis on the fringe of Osterley Park), Feltham (postwar and interwar suburban estates to the south-west) and Hounslow (the town centre with mixed terraces and converted flats) — these are the Hounslow pockets our drawings cover most. Heritage designations here include Bedford Park, Old Chiswick, Strand-on-the-Green, Wellesley Road and Old Isleworth. Hounslow Council weighs each proposal against Hounslow Local Plan and the Residential Extension Guidelines SPD, where the borough's western edge sits under Heathrow flight paths, so glazing, ventilation and noise mitigation surface on larger schemes. Converted terraces are common through central Chiswick and Brentford, and flats and maisonettes carry no householder permitted-development rights.. On roofs the borough is London butterfly and valley roofs on the Chiswick terraces and hipped roofs on the interwar semis, over Victorian and Edwardian terraces across Chiswick, interwar semi-detached houses around Osterley and Hounslow and converted period flats and maisonettes.
A wraparound is the ambitious ground-floor move, and Hounslow has the stock that suits it — the borough is built largely from Victorian and Edwardian terraces across Chiswick, interwar semi-detached houses around Osterley and Hounslow and converted period flats and maisonettes, and the terraces and semis with an L-shaped back addition give you both a side alley to infill and a rear garden to project into. Do both in one L-shaped sweep and the kitchen, dining and living space merge into a single room that runs the full width of the house and out into the garden. Hounslow Council assesses the scheme against Hounslow Local Plan and the Residential Extension Guidelines SPD, and because the footprint is large it looks hardest at what survives of the garden.
The drawings carry the argument. We show the retained private amenity space to scale, prove the rear projection sits within the depth the council accepts for the house type, and set the side leg so it clears the boundary and keeps the neighbour's daylight — a wraparound touches two boundaries, not one, so both neighbour relationships are drawn out. Side-return and mansard schemes dominate in Chiswick, where officers weigh roof bulk against a strongly uniform terrace roofscape, which on a footprint this size is where a scheme is won or lost.
Where Hounslow's streets sit in conservation areas — Bedford Park, Old Chiswick, Strand-on-the-Green, Wellesley Road and Old Isleworth among them — a wraparound is never permitted development and the design is read against the area's character. Bedford Park — the pioneering garden suburb shared with Ealing — carries a long-standing Article 4 direction, and the Chiswick and Old Isleworth conservation areas remove permitted-development rights on many of their period streets. We settle the designation before the footprint is fixed.
A wraparound in Hounslow almost always needs a full householder application, because joining a side infill to a deep rear extension takes it past permitted-development limits. You will need to apply to Hounslow Council if any of these apply — and for a true wraparound, at least one always will:
We draw the L-shaped footprint against the retained garden, the rear depth within the council's limit for your house type and the two neighbour boundaries the side and rear legs touch — the things Hounslow Council's officers and both neighbours check — then submit a validation-complete householder application.
Below is Hounslow Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Hounslow grants a fair share of householder applications, with terrace roofscape in the Chiswick conservation areas the dominant constraint on loft and rear schemes. A wraparound stands or falls on the garden it leaves and the two boundaries it meets, so a pack that settles both upfront is decided faster and refused less often than a DIY submission.
Source: MHCLG planning application statistics (householder decisions, rolling year). Compare every borough on our London approval-rate league table.
Tell us about your project and get a fixed, no-obligation quote back within one working day. If you don't need planning permission at all, we'll tell you that too — for free.
Across Chiswick, Brentford and Isleworth, the approved wraparound is a single-storey L that reads as one considered addition rather than two bolted together: the rear leg kept to the depth the council accepts, the side leg matched to the host brick and roofed with a glazed flat or lantern, and enough garden left to satisfy the borough's private-amenity expectation. On the borough's victorian and edwardian terraces across chiswick, this is the biggest transformation the ground floor can take in a single application.
The borough's western edge sits under Heathrow flight paths, so glazing, ventilation and noise mitigation surface on larger schemes. We size the footprint so the garden that remains still works, keep the eaves and roof low enough to protect both neighbours' light, and present the whole L as a single scheme — which reads far more clearly to Hounslow Council than a side return and a rear extension submitted as separate, overlapping proposals.
We draw L-shaped wraparounds on the terraced and semi-detached streets across the borough. A few of the neighbourhoods where Hounslow wraparounds come up most often:
Wraparound extension drawings for Chiswick's Victorian and Edwardian terraces wrapped around the Bedford Park garden suburb — garden-checked, boundary-detailed and drawn to Hounslow Council's guidance.
Wraparound extension drawings for Brentford's older riverside terraces alongside recent waterfront redevelopment — garden-checked, boundary-detailed and drawn to Hounslow Council's guidance.
Wraparound extension drawings for Isleworth's the Old Isleworth riverside conservation area and Georgian frontages — garden-checked, boundary-detailed and drawn to Hounslow Council's guidance.
Wraparound extension drawings for Osterley's interwar semis on the fringe of Osterley Park — garden-checked, boundary-detailed and drawn to Hounslow Council's guidance.
Wraparound extension drawings for Feltham's postwar and interwar suburban estates to the south-west — garden-checked, boundary-detailed and drawn to Hounslow Council's guidance.
Wraparound extension drawings for Hounslow's the town centre with mixed terraces and converted flats — garden-checked, boundary-detailed and drawn to Hounslow Council's guidance.
A wraparound is the two smaller extensions combined — which changes what Hounslow Council needs and what the ground floor gains. This is how the options compare.
| Ground-floor option | Permitted development? | What it gains | What Hounslow Council checks |
|---|---|---|---|
| Side return only | Sometimes, within width and height limits | Full-width kitchen | Width, roof glazing |
| Rear extension only | Often, within the depth limit | Deeper living space | Rear depth, neighbour daylight |
| Wraparound (side + rear) | No — full application | Largest open-plan ground floor | Combined footprint, garden retained |
| Two-storey wraparound | No — full application | Room above as well as below | Bulk, overlooking, two boundaries |
In conservation areas such as Bedford Park and Old Chiswick, a wraparound is never permitted development and always needs a full application.
A fixed process built around how Hounslow Council validates and decides wraparound applications — most drawings are submission-ready within seven days of survey.
Send us your Hounslow postcode and house type. We confirm your conservation and Article 4 status, measure the garden against the borough's amenity expectation, and score your odds against live Hounslow Council decisions.
We measure the side alley, the rear building line, the garden depth and both neighbours' window heights — the numbers the footprint, rear depth and two-boundary daylight tests depend on.
Chartered designers develop the L-shaped extension to your brief, drawn to Hounslow Council's extension guidance with the retained garden, rear depth and both boundary junctions detailed on the page.
We submit the householder application, manage validation and case-officer queries, and revise the drawings free until Hounslow Council issues its decision.
Almost always. A wraparound joins a side-return infill to a rear extension, and that combination takes the footprint past what permitted development allows, so it needs a full householder application to Hounslow Council. Only the rare, very shallow case stays within the limits. On designated land — a conservation area such as Bedford Park and Old Chiswick — a wraparound is never permitted development, so an application is certain.
It is an L-shaped extension that fills the side return and wraps around into a full-width rear extension in one continuous sweep, so the kitchen, dining and living space become a single open room the width of the house. Hounslow's period terraces and semis with an L-shaped back addition suit it well, which is why the wraparound is the borough's biggest single-storey extension. Hounslow Council is the decision-maker.
Hounslow Council expects a usable amount of private garden to survive, because a wraparound is the deepest single-storey footprint and takes the most outdoor space. There is no single fixed figure — it is judged on the plot and the borough's amenity guidance — so we draw the retained garden to scale and size the extension around it, rather than maximising the build and hoping it passes.
Usually on both sides. A wraparound touches two boundaries — the side leg runs along one neighbour and the rear leg can affect the other — so the Party Wall etc. Act often applies to each, and notice must be served before work starts. This is separate from Hounslow Council's planning decision. We detail both boundary junctions on the drawings and flag the notices early so surveyors can be appointed without delaying the build.
Built as one project it usually is, and it reads better to Hounslow Council too. A single wraparound application covers the whole L-shaped footprint in one decision rather than two overlapping submissions, and the build shares one set of foundations, one roof and one disruption. We draw it as a single coherent scheme so the council assesses one clear proposal instead of piecing two together.
We price each Hounslow wraparound individually, because garden depth, side-alley width and roof form vary house to house, and send a fixed, no-obligation quote within one working day. It covers the full drawing pack with free revisions until Hounslow Council approves, and we confirm the retained-garden and boundary position at the outset. Call 020 7864 7245 to start.
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