Double Storey Extension Drawings in Hammersmith W6
Fixed-fee, MCIAT-chartered double storey extension drawings for Hammersmith (W6) homeowners — London Borough of Hammersmith & Fulham validation and local constraints handled from the start.
Hammersmith (W6) runs from the tight Victorian grid of Brackenbury Village up to the larger houses around Brook Green, and side-return and loft projects are the staple here. The Bradmore conservation area covers most of Brackenbury's streets, so what reads as a routine extension a few roads away is a conservation-area application within its boundary.
Brook Green adds a second, distinct context of larger period houses and stucco frontages under their own conservation-area control. We check which grid a Hammersmith property sits in — and where its boundary falls — before recommending a route, and prepare the drawings to the borough's design and validation standards.
Planning in Hammersmith (W6): what to know before you apply
W6 sits across the Bradmore and Brook Green conservation areas, which cover much of the residential grid and remove permitted development rights on many streets, so extensions and loft conversions are assessed against the borough's conservation guidance. London Borough of Hammersmith and Fulham does not publish an Article 4 schedule to the national open-data register, so an empty entry there is not evidence of absence — we confirm the current directions and conservation boundary with the council before advising.
Typical Hammersmith housing stock
Tight grids of two- and three-storey Victorian terraces around Brackenbury Village, larger stucco-fronted and villa houses toward Brook Green, and Edwardian red-brick mansion flats on the main approaches.
Streets we regularly draw for in Hammersmith
Brackenbury Road · Aldensley Road · Hammersmith Grove · Brook Green · Goldhawk Road
What W6 is actually built of
Measured from 388 classified residential buildings in W6, not from a description of the area.
Hammersmith 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.
Double Storey Extension Drawings for Hammersmith (W6) homes: the package and the process
At first-floor level the drawings have to answer for daylight, privacy and massing. That means proposed elevations showing every new window with its position relative to the boundary, a section taken through the extension and the neighbouring building, and a roof form drawn to sit below the existing ridge rather than compete with it.
We draw the neighbouring property alongside your own, because the officer's assessment is comparative — the effect on their windows and outlook is the test. Setting the first floor in from the boundary, and showing that set-back as a dimension, resolves most objections before consultation begins.
At first floor the boundary relationship decides everything. A detached house has room to set the addition in on both sides; a semi has one shared wall and one clear flank; a mid-terrace can usually only go to the rear, where the effect on both neighbours has to be drawn.
Do I need planning permission for a double storey extension in London?
Almost always. Permitted development rights for two-storey extensions are far more restrictive than for single-storey work, particularly on how close the new structure can come to a boundary and how closely its roof pitch and eaves height must match the existing house, so most double storey projects are drawn and submitted as full householder planning applications rather than relying on permitted development.
Where the property sits in a conservation area or is subject to an Article 4 direction, any remaining permitted development allowance for a second storey is typically removed entirely, reinforcing the need for a full application. We check your property's status and your borough's design guidance before drawing.
How do councils control the impact of a double storey extension on neighbours?
Because a second storey introduces new windows and massing at first-floor level, London boroughs apply design guidance aimed specifically at protecting neighbouring light, privacy and outlook.
- The 45-degree rule, tested at neighbouring windows, to check the extension does not block an unreasonable amount of daylight
- A common design expectation that a two-storey side extension is set in roughly 1 metre from the shared boundary, rather than built hard against it
- A first floor commonly set back from the ground floor front elevation, so the upper storey reads as subordinate to the main house from the street
- Obscure or high-level glazing on flank walls facing directly into a neighbour's garden or windows, to limit overlooking
Matching the roofline and materials
Planning officers assess a double storey extension heavily on how convincingly it reads as part of the original house rather than an addition bolted onto the side. Our drawings match ridge height, roof pitch, eaves detail and brick or render finish to the existing building wherever the design brief allows, which is consistently one of the strongest factors in securing approval without delay or redesign. Where a subtly contrasting material is proposed instead — a different brick tone, or a zinc or slate roof against a tiled original — we set it out clearly on the elevations so the design intent reads as deliberate rather than a mismatch, which is how most London boroughs prefer a genuine design statement to be presented.
| Option | What it adds | Typical fee |
|---|---|---|
| Single-storey rear extension | A ground-floor kitchen-diner only, may qualify for permitted development | see Rear Extension Drawings, from £1,100 |
| Double storey side or rear extension | Two rooms across two floors, usually needs full planning | Full Planning pack ~£1,600–£2,400 |
| Double storey + Building Regulations (structural) | Combined pack including structural calculations for two-floor loads and foundations | Planning + Building Regs pack ~£2,200–£3,850 |
| Wraparound (rear + side return) | Combines two single-storey extensions into one L-shaped ground floor | see Wraparound Extension Drawings, from £2,200 |
Double Storey Extension Drawings in Hammersmith W6 — FAQs
How much does a double storey extension cost to design in London?+
Do I need planning permission to add a second storey?+
Will a double storey extension overlook my neighbour's garden?+
Do I need an architect for a double storey extension?+
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Do I need planning permission for a side-return extension in Hammersmith & Fulham?+
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What is special about the Peterborough Estate 'Lion houses'?+
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