House Extension Drawings in Hillingdon UB10
Fixed-fee, MCIAT-chartered house extension drawings for Hillingdon (UB10) homeowners — London Borough of Hillingdon validation and local constraints handled from the start.
UB10 spans two distinct worlds: the historic village cores of Ickenham and Hillingdon Village, and the large belt of 1930s suburban semis and detached houses around them where most rear and loft projects happen. On the suburban stock the design conversation is about matching established roofline and frontage patterns, which Hillingdon's guidance sets out clearly.
Inside either village conservation area the emphasis shifts to protecting period character around St Giles and St John the Baptist churches, so materials, rooflines and boundary treatments face tighter control. Because the two conservation-area boundaries are compact, we confirm exactly where a UB10 property falls before choosing a permitted-development or full-application route.
Planning in Hillingdon (UB10): what to know before you apply
Most UB10 householder work sits on interwar suburban housing outside the conservation areas, where Hillingdon has well-established expectations for rear depth, side returns and dormers. The Ickenham Village and Hillingdon Village conservation areas are the exceptions — there, heritage-led design and usually a full application are the right approach.
Typical Hillingdon housing stock
Two protected village centres — Ickenham around St Giles Church and Hillingdon Village around St John the Baptist — of period cottages and Victorian houses, ringed by the substantial 1930s semi-detached and detached suburban stock that makes up most of the wider UB10 postcode.
Streets we regularly draw for in Hillingdon
Swakeleys Road · Austin's Lane · Royal Lane · Vine Lane
What UB10 is actually built of
Measured from 318 classified residential buildings in UB10, not from a description of the area.
Hillingdon UB10 housing mix
Residential building form across the UB10 postcode district, from 318 classified buildings.
| Attached on more than one side | 28% |
|---|---|
| Attached on one side | 46% |
| Detached | 27% |
| Median building footprint | 71 m² |
| Addresses per buildingAbove about 2 means flats and maisonettes dominate | 1.13 |
| Buildings classified | 318 |
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.
House Extension Drawings for Hillingdon (UB10) homes: the package and the process
Extension drawings are read for their dimensions. The proposed plan needs depth measured from the original rear wall — not from a previous extension — eaves and ridge heights taken from existing ground level, and the distance to each boundary marked. A site plan showing how much garden remains is what an officer reaches for when the amenity question comes up.
We draw the existing building accurately first, because everything else is measured from it. Where the original footprint has already been added to, that history goes on the drawing: it decides which allowances are still available and it is the first thing an officer checks against the council's own records.
The plot decides the extension type long before taste does. A mid-terrace has depth to work with and an alley if it is lucky; a semi has one clear flank; a detached house can go wide. Reading the building form first is what stops a design being drawn that the plot cannot take.
Which extension types do you draw?
Every London extension is shaped by the plot, the neighbours and the borough's design guidance. We draw them all.
Rear extension
A single-storey rear extension is often permitted development within depth limits — ideal for an open-plan kitchen-diner.
Side-return
Fills the alley beside a Victorian terrace, widening the ground floor without losing garden.
Wraparound
Combines a rear and side-return extension for a transformative ground floor, usually needing planning permission.
Double-storey
Adds space above and below, subject to tighter scale and neighbour-impact scrutiny.
Basement
Creates space downward where footprint is limited, with structural and party-wall care.
Do I need planning permission for a house extension in London?
Single-storey rear extensions within permitted development limits (up to 6m for terraced/semi-detached homes under the larger-home scheme, subject to neighbour consultation) may not need a full application. Wraparounds, double-storeys and anything in a conservation area usually do. We assess your plot and recommend the right route before drawing. The current depth, height and eaves limits are set out in full in the guide to planning permission for a rear extension, and where you would rather one practice ran the design, the application and the building-regulations stage together, Architectural Drawings covers that full scope.
How do you maximise the footprint the council will approve?
We know each borough's depth, height and daylight standards, so we design to the edge of what will be approved rather than guessing — and we check the 45-degree neighbour daylight rule and any rear building line before submission. Where a plot is tight we test a permitted-development scheme against a slightly larger householder application and show you the trade-off in space, cost and timescale, so the drawn scheme is the one that actually maximises value rather than just floor area.
| Extension | Typical route | Package | Fee from |
|---|---|---|---|
| Single-storey rear | Permitted development / householder | Planning + building regs | £1,100 |
| Side-return | Householder planning | Planning + building regs + structural | £1,600 |
| Wraparound | Householder planning | Full package + structural | £2,200 |
| Double-storey | Householder planning | Full package + structural | £2,400 |
House Extension Drawings in Hillingdon UB10 — FAQs
How far can I extend without planning permission in London?+
Do extension drawings include structural calculations?+
How long do extension drawings take?+
Will my rear extension need a party wall agreement?+
Can I extend a house in a conservation area?+
Do I need planning permission for a loft conversion in Hillingdon?+
How does the Colne Valley green belt affect my Hillingdon project?+
Does proximity to Heathrow affect my plans?+
How long does Hillingdon Council take to decide?+
How much do planning drawings cost in Hillingdon?+
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