Back-of-house extension drawings for Harborne homes — the glazed kitchen-diner across the rear, drawn to Birmingham City Council's depth and daylight limits, delivered in days and revised free until your decision, with a free approval-odds check first.
Birmingham City Council granted 84% of the householder planning decisions it made in its latest published year — 3 points below the 87% England-wide householder average. The Moor Pool conservation-area appraisal protects the estate's cottage detailing, hedges and communal greens against incremental change, which is where a policy-literate drawing pack earns its keep. Its dominant Victorian (1837–1901), Edwardian (1901–1910) and interwar (1918–1939) housing stock sets the design brief on most streets.
Before permission is required, Class B allows 40m³ of added loft volume on a terrace and 50m³ on a semi or detached house, and Class A allows a 3m single-storey rear extension on a terrace or 4m on a detached house. Harborne carries at least one Article 4 direction, and conservation areas including Harborne Old Village and Moor Pool remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Harborne is determined against an 8-week statutory target.
Harborne Old Village (the historic High Street core with its conservation area), Moor Pool (John Sutton Nettlefold's 1908 garden suburb of cottages around a village hall and greens), High Street (Victorian terraces and shopfronts along the main spine), Court Oak (interwar semis on the western fringe towards Quinton), Bearwood edge (dense Edwardian terraces bordering Smethwick) and Metchley (1930s semis near the university and hospital campus) — these are the Harborne pockets our drawings cover most. Heritage designations here include Harborne Old Village and Moor Pool. Birmingham City Council weighs each proposal against Birmingham Development Plan (2017) and the Birmingham Design Guide / relevant SPDs, where Harborne's proximity to the university keeps HMO pressure high, so C3-to-C4 conversions are tested against the 10%-within-100m concentration policy. Converted flats are common in the larger Edwardian houses near the High Street, and none carry householder permitted-development rights.. On roofs the borough is gabled roofs on the terraces and Moor Pool cottages and hipped roofs on the interwar semis, over Victorian and Edwardian terraces around the High Street, Arts-and-Crafts cottages on the Moor Pool estate and interwar semi-detached houses on the outer streets.
The rear extension is the workhorse of Harborne home improvement — it is how a dark back kitchen becomes an open family room facing the garden. Because the borough is built largely from Victorian and Edwardian terraces around the High Street, Arts-and-Crafts cottages on the Moor Pool estate and interwar semi-detached houses on the outer streets, most back walls sit close to a neighbour on at least one side, and that proximity, not the design, is what Birmingham City Council scrutinises. The council reads the proposal against Birmingham Development Plan (2017) and the Birmingham Design Guide / relevant SPDs, and the first line an officer draws is the 45-degree splay from the neighbour's nearest window.
So the drawings live or die on geometry. We set the depth against the exact permitted-development figure, hold the eaves and the flat-roof or lantern build-up under the 4-metre height ceiling, and show the projection tested against both the 45-degree plan angle and the 25-degree section angle to the neighbouring windows. The Moor Pool conservation-area appraisal protects the estate's cottage detailing, hedges and communal greens against incremental change, so the rear elevation is composed around it rather than corrected after an objection.
Where the property sits in a conservation area — Harborne Old Village and Moor Pool among Harborne's — the larger-home extension route is switched off and even a modest rear addition needs consent. The Moor Pool estate — an early Arts-and-Crafts garden suburb — carries tight conservation controls, and Birmingham's city-wide Article 4 direction removes the permitted right to convert family homes to small HMOs across this popular student-and-professional district. We confirm the designation before the survey.
Many single-storey rear extensions in Harborne are permitted development and need no application. You will normally need to apply to Birmingham City Council, or use the larger-home prior-approval route, if any of these apply:
We draw the depth, the roof build-up and the daylight splays to each neighbour on the page — the tests Birmingham City Council's officers apply first — and submit a validation-complete pack, whether that is a lawful development certificate, a larger-home prior-approval notice or a full householder application.
Below is Birmingham City Council's real householder decision record, taken from official planning statistics and refreshed as new data lands. Birmingham grants a high share of householder applications overall, with Harborne's Moor Pool controls and heavy HMO demand the recurring constraints on change. Rear extensions turn most often on neighbour daylight and depth, so a drawing pack that proves those tests upfront is decided faster and refused less often than a DIY submission.
Source: MHCLG planning application statistics (householder decisions, England, 1 April 2025 - 31 March 2026). 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 Harborne Old Village, Moor Pool and High Street, the approved rear extension is typically a single-storey glazed box within the depth limit, roofed either flat with a lantern or in a shallow mono-pitch, and finished in brick or render to match the host wall. On the borough's victorian and edwardian terraces around the high street, keeping the projection to the permitted-development figure often avoids an application entirely; where owners want the full 6 metres, the larger-home route succeeds when the neighbour-consultation period passes without a sustained objection.
Harborne's proximity to the university keeps HMO pressure high, so C3-to-C4 conversions are tested against the 10%-within-100m concentration policy. We keep the extension inside the daylight splays, set any glazed roof below the first-floor cill, and retain the garden depth Birmingham City Council expects — so the back elevation answers the amenity case before a neighbour can lodge one. Two-storey rear extensions we draw with the 7-metre boundary gap and privacy screening resolved on the plan.
We draw rear extensions on every street in the borough. A few of the neighbourhoods where Harborne back-of-house projects come up most often:
Rear extension drawings for Harborne Old Village's the historic High Street core with its conservation area — depth-checked, daylight-tested and drawn to Birmingham City Council's guidance.
Rear extension drawings for Moor Pool's John Sutton Nettlefold's 1908 garden suburb of cottages around a village hall and greens — depth-checked, daylight-tested and drawn to Birmingham City Council's guidance.
Rear extension drawings for High Street's Victorian terraces and shopfronts along the main spine — depth-checked, daylight-tested and drawn to Birmingham City Council's guidance.
Rear extension drawings for Court Oak's interwar semis on the western fringe towards Quinton — depth-checked, daylight-tested and drawn to Birmingham City Council's guidance.
Rear extension drawings for Bearwood edge's dense Edwardian terraces bordering Smethwick — depth-checked, daylight-tested and drawn to Birmingham City Council's guidance.
Rear extension drawings for Metchley's 1930s semis near the university and hospital campus — depth-checked, daylight-tested and drawn to Birmingham City Council's guidance.
How far you can extend at the back in Harborne depends on your house type and the route you take. This is how the options compare.
| Route | Depth allowed | Consent needed | What Birmingham City Council checks |
|---|---|---|---|
| Standard permitted development | 3m terrace/semi · 4m detached | Lawful development certificate (optional) | Depth, 4m height, materials |
| Larger-home prior approval | 6m terrace/semi · 8m detached | Prior-approval notice + neighbour consultation | Neighbour objections on amenity |
| Full householder application | Beyond the above, or two-storey | Full planning permission | Daylight (45°/25°), bulk, garden retained |
| Conservation area | Case by case | Full planning permission | Character, roof form, boundary treatment |
The larger-home route is switched off on designated land — conservation areas such as Harborne Old Village and Moor Pool and Article 4 streets need a full application.
A fixed process built around how Birmingham City Council validates and decides rear-extension applications — most drawings are submission-ready within seven days of survey.
Send us your Harborne postcode and house type. We confirm your conservation and Article 4 status, how much rear-extension depth you have under permitted development, and score your odds against live Birmingham City Council decisions.
We measure the original rear wall, floor and eaves levels, side and rear boundary distances and the neighbours' window positions — the numbers the depth limit and daylight splays depend on.
Chartered designers develop the single or two-storey rear extension to your brief, drawn inside the permitted-development limits or to Birmingham City Council's extension design guidance, with the daylight angles shown.
We submit the certificate, prior-approval notice or application, handle validation and case-officer queries, and revise the drawings free until Birmingham City Council issues its decision.
Often not. A single-storey rear extension up to 3 metres deep on a terrace or semi, or 4 metres on a detached house, and no higher than 4 metres, is usually permitted development in Harborne. You will need to involve Birmingham City Council for anything deeper via the larger-home route, for two-storey rear extensions, and for any rear extension in a conservation area such as Harborne Old Village and Moor Pool, where those permitted-development rights fall away.
The larger-home extension scheme lets a single-storey rear extension reach 6 metres on a terrace or semi, or 8 metres on a detached house — double the standard allowance. It is not automatic: you submit a prior-approval notification to Birmingham City Council, neighbours are consulted, and if one objects on amenity grounds the council rules on it. It also does not apply on designated land such as Harborne's conservation areas.
It is the daylight test Birmingham City Council applies to protect neighbours. Drawn on plan, a line at 45 degrees from the midpoint of the neighbour's nearest ground-floor window should not be crossed by your extension; a companion 25-degree line is checked in section. If the projection breaches it, the extension is likely to be shortened or refused, so we test and prove it on the drawings before submission. This applies to your Harborne address specifically.
A two-storey rear extension almost always needs a full householder application to Birmingham City Council, as it sits outside permitted development on most homes. The council checks that it stays at least 7 metres from the rear boundary, does not overbear the neighbours and avoids new overlooking. We resolve the boundary gap, privacy and daylight on the plans so the application is decided on its merits. This applies to your Harborne address specifically.
Frequently, yes. If the rear extension involves work to a shared wall, building up to the boundary, or excavating foundations near a neighbour's structure, the Party Wall etc. Act applies and you must serve notice — this is separate from Birmingham City Council's planning decision. We flag it early and can prepare the drawings a party-wall surveyor needs alongside the planning set. This applies to your Harborne address specifically.
We price each Harborne rear extension on its own footprint and send a fixed, no-obligation quote within one working day. It covers the full drawing pack with free revisions until Birmingham City Council approves, and we confirm at the outset whether your extension is permitted development, needs prior approval, or a full application. Call 020 7864 7245 to begin.
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