Flat Conversion Drawings in Eltham SE9
Fixed-fee, MCIAT-chartered flat conversion drawings for Eltham (SE9) homeowners — Royal Borough of Greenwich validation and local constraints handled from the start.
Eltham (SE9) sits in the Royal Borough of Greenwich and is best known for the Progress Estate at Well Hall — a 1915 Arts-and-Crafts garden suburb that inspired much interwar housing and has been a conservation area since 1971. An Article 4 direction covers the estate, so on those streets even small external changes need consent, and rear and loft projects have to be handled with real care for the original detailing.
Away from the estate, much of Eltham is consistent interwar semi-detached and terraced housing where side-return, rear and loft projects are the staple. The district also carries the setting of Eltham Palace and its listed gardens. We check where an Eltham property sits relative to the Progress Estate Article 4 area and the palace setting before recommending a permitted-development or full-application route under Greenwich's guidance.
Planning in Eltham (SE9): what to know before you apply
Eltham's Progress Estate at Well Hall carries a conservation-area designation and an Article 4 direction (1973), so permitted-development rights are removed across the estate and external changes need planning permission. Elsewhere in SE9 many interwar houses retain PD rights for rear and loft work, but the consistent frontages and the setting of Grade I listed Eltham Palace mean elevation and roof changes are assessed closely. We confirm which controls apply to a specific address before drawing.
Typical Eltham housing stock
The 1915 Arts-and-Crafts cottages and greens of the Progress Estate around Well Hall Road, interwar semi-detached and terraced housing across much of Eltham, and later post-war housing toward Mottingham and New Eltham.
Streets we regularly draw for in Eltham
Well Hall Road · Court Road · Eltham High Street · Ross Way
What SE9 is actually built of
Measured from 511 classified residential buildings in SE9, not from a description of the area.
Eltham SE9 housing mix
Residential building form across the SE9 postcode district, from 511 classified buildings.
| Attached on more than one side | 39% |
|---|---|
| Attached on one side | 57% |
| Detached | 4% |
| Median building footprint | 62 m² |
| Addresses per buildingAbove about 2 means flats and maisonettes dominate | 1.22 |
| Buildings classified | 511 |
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.
Flat Conversion Drawings for Eltham (SE9) homes: the package and the process
Converting a house into flats is drawn unit by unit. Each proposed flat needs its layout, its floor area, its own entrance arrangement and its amenity provision shown, along with refuse and cycle storage that meets the standards the council applies to new residential units.
The separation between units is the technical core: floors and walls detailed for fire resistance and sound insulation, a common escape route drawn and protected, and services routed without breaching the compartments. Those details go on the drawings because Building Control assesses them there, not on site.
Conversion suits buildings with the plan depth and stair position to make two workable units. A wide terrace or a large semi can usually be split without landlocking a room, while a narrow plan often cannot give both units light, access and separation at the same time.
Do I need planning permission to convert a house into flats?
Yes, always. Converting a single dwelling into two or more self-contained flats is a change from one home to several, and that subdivision is treated as development requiring a full planning application — there is no permitted development route that allows it, regardless of the property's size or whether the exterior changes at all. The application has to demonstrate that each flat meets space, layout, amenity and parking standards in its own right, not just that the building as a whole is being used sensibly.
Boroughs also weigh the loss of a family-sized house against their local housing policy, since converting a larger house into several flats reduces the stock of homes suited to families even as it adds smaller units. We take that policy context into account when advising on layout and unit numbers, rather than simply maximising the number of flats the floor area could technically support.
What sound insulation is required between flats?
Part E of the building regulations sets minimum sound insulation standards for the walls and floors separating flats, covering both airborne and impact sound. Where an existing house is subdivided, the drawings specify how the party floors and walls between units will be upgraded — additional layers, resilient bars, or a floating floor — and pre-completion sound testing is normally required before the flats can be signed off. Getting this detail right on the drawings from the outset matters, because retrofitting sound insulation after a failed test usually means taking up a finished floor or ceiling that has already been decorated.
How do you design fire escape and compartmentation for flat conversions?
Each flat needs its own independent means of escape to a place of safety, and the building has to be compartmented so that fire in one flat does not spread into another or into the shared circulation space. On a typical converted house this means fire-rated floors, walls and doors between units, and either a protected common stairway shared by the flats or separate final exits for each one, depending on the layout.
Where flats sit above ground floor level, escape routes and fire doors are designed together with the sound insulation upgrade, since the same floor and wall build-ups often need to satisfy both requirements at once.
| Conversion | Typical scope | Route | Fee from |
|---|---|---|---|
| House to two self-contained flats | Vertical split, separate or shared entrance | Full planning plus building regulations | £1,600 |
| House to three or more flats | Multiple units, fire strategy required | Full planning plus building regs plus structural | £2,400 |
| Flat conversion with a side or rear extension | Additional floor area added to create compliant units | Full planning plus structural calculations | £2,800 |
Flat Conversion Drawings in Eltham SE9 — FAQs
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