Rear dormer drawings for Bournville roofs — the box across the back slope that turns a low attic into a full-height room, drawn to Birmingham City Council's guidance and the volume 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 Bournville Village Trust scheme of management runs alongside council planning control, and its design approval is needed for external changes across much of the estate, which is where a policy-literate drawing pack earns its keep. Its dominant Edwardian (1901–1910) and interwar (1918–1939) housing stock sets the design brief on most streets.
Class A and Class B set the thresholds — a rear dormer to 40m³ on a terrace or 50m³ on a semi or detached, and a single-storey rear extension to 3m on a terrace or 4m on a detached house — beyond which Birmingham City Council needs a full application. Bournville carries at least one Article 4 direction, and conservation areas including Bournville Village and Bournville Tenants remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Bournville is determined against an 8-week statutory target.
Bournville Village Green (the model-village heart of cottages around the green, school and Rest House), Bournville Tenants (an early-20th-century co-partnership estate of garden-suburb housing), Selly Manor (conservation-grade cottages near the relocated timber-framed hall), Weoley Hill (Trust-managed interwar semis on tree-lined avenues), Cotteridge edge (Edwardian terraces bordering the village to the east) and Stirchley fringe (workers' terraces near the former Cadbury works) — these are the Bournville pockets our drawings cover most. Heritage designations here include Bournville Village and Bournville Tenants. Birmingham City Council weighs each proposal against Birmingham Development Plan (2017) and the Birmingham Design Guide / relevant SPDs, where the conservation-area appraisal protects the low-density garden-village layout, hedges, verges and original cottage detailing. On roofs the borough is steep-pitched tiled roofs on the Arts-and-Crafts cottages and gabled roofs on the interwar semis, over Arts-and-Crafts cottages and semis built for the Cadbury model village, interwar Bournville Tenants co-partnership housing and later 20th-century estate infill.
The box dormer is the workhorse loft, and most of Bournville is built for it — the borough runs to Arts-and-Crafts cottages and semis built for the Cadbury model village, interwar Bournville Tenants co-partnership housing and later 20th-century estate infill under steep-pitched tiled roofs on the Arts-and-Crafts cottages and gabled roofs on the interwar semis, and a flat-roofed box across the rear slope is the cheapest cubic metre of full-height space those roofs give up. Birmingham City Council tests the dormer against Birmingham Development Plan (2017) and the Birmingham Design Guide / relevant SPDs, and because permitted development turns on a number, the volume you propose against the volume you have left is the first thing an officer or a certificate checks.
That is why the arithmetic goes on the drawings. We calculate the box against the 40- or 50-cubic-metre allowance, count any earlier roof enlargement into the total, hold the flat roof below the ridge and set the face back off the eaves so the dormer reads as subordinate. The Bournville Village Trust scheme of management runs alongside council planning control, and its design approval is needed for external changes across much of the estate, so the cheeks, the window line and the material are drawn to answer it rather than invite a query.
Where Bournville's streets are protected — Bournville Village and Bournville Tenants among them — the Class B dormer right is switched off and even a modest rear box needs consent. The Bournville Village conservation area carries an Article 4(2) direction, and much of the estate is additionally bound by the Bournville Village Trust's own scheme of management, so even minor external changes need consent on top of Birmingham's city-wide HMO Article 4 direction. We confirm the designation before the box is sized.
Many rear dormers in Bournville are permitted development, but the volume and position decide it. You will normally need a full application to Birmingham City Council if any of these apply:
We draw the box within its volume allowance, the flat roof below the ridge and the face set back off the eaves — the three things a dormer stands or falls on — and submit a validation-complete pack, whether that is a lawful development certificate or a full householder application.
Below is Birmingham City Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Birmingham grants a high share of householder applications overall, but Bournville is unusual in adding the Trust's scheme of management to conservation control, so extensions here clear two approvals rather than one. A dormer is decided on volume and set-back, so a pack that shows the calculation and the eaves detail is cleared 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 Bournville Village Green, Bournville Tenants and Selly Manor, the dormer that goes through is the subordinate rear box: flat roof kept low, cheeks clad to recede, side windows obscure-glazed against overlooking, and the whole thing set back so the original eaves line still reads from the garden. On steep-pitched tiled roofs on the Arts-and-Crafts cottages, this returns a full-height double and en-suite from what was standing-room-only, usually inside the permitted-development volume.
The conservation-area appraisal protects the low-density garden-village layout, hedges, verges and original cottage detailing. We keep the box off the ridge, match the cheek material to the roof, and where the volume is already spent — or the street is designated — draw the dormer as a householder application composed to Birmingham City Council's roof-alteration guidance rather than push a certificate that would be refused.
We draw rear dormers on the terraced and semi-detached streets across the borough. A few of the neighbourhoods where Bournville dormers come up most often:
Dormer loft drawings for Bournville Village Green's the model-village heart of cottages around the green, school and Rest House — volume-checked, set-back-detailed and drawn to Birmingham City Council's guidance.
Dormer loft drawings for Bournville Tenants's an early-20th-century co-partnership estate of garden-suburb housing — volume-checked, set-back-detailed and drawn to Birmingham City Council's guidance.
Dormer loft drawings for Selly Manor's conservation-grade cottages near the relocated timber-framed hall — volume-checked, set-back-detailed and drawn to Birmingham City Council's guidance.
Dormer loft drawings for Weoley Hill's Trust-managed interwar semis on tree-lined avenues — volume-checked, set-back-detailed and drawn to Birmingham City Council's guidance.
Dormer loft drawings for Cotteridge edge's Edwardian terraces bordering the village to the east — volume-checked, set-back-detailed and drawn to Birmingham City Council's guidance.
Dormer loft drawings for Stirchley fringe's workers' terraces near the former Cadbury works — volume-checked, set-back-detailed and drawn to Birmingham City Council's guidance.
Whether a dormer in Bournville needs permission comes down to where it sits and how big the box is. This is how the cases compare.
| Dormer type | Permitted development? | What it gains | What Birmingham City Council checks |
|---|---|---|---|
| Rear box, within volume | Usually yes | Full-height room across the back | Volume total, 20cm eaves set-back |
| Rear box, over volume limit | No — full application | A larger room | How far over the allowance, bulk |
| Front or side dormer | No — full application | Light to the front rooms | Visibility from the street, character |
| Dormer in a conservation area | No — full application | Same space, extra scrutiny | Roof form and street appearance |
In conservation areas such as Bournville Village and Bournville Tenants, Class B dormer rights are removed and every dormer needs a full application.
A fixed process built around how Birmingham City Council validates and decides dormer applications — most drawings are submission-ready within seven days of survey.
Send us your Bournville postcode and roof type. We confirm your conservation and Article 4 status, work out how much permitted-development volume you have left, and score your odds against live Birmingham City Council decisions.
We measure ridge and eaves heights, roof pitch and the existing loft floor — the numbers the volume calculation, the set-back and the head heights depend on.
Chartered designers develop the box to your brief, drawn inside the Class B volume limits or, where those are exhausted or removed, to Birmingham City Council's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until Birmingham City Council issues its decision.
Often not. A rear box dormer within 40 cubic metres on a terrace, or 50 on a semi or detached house, set back at least 20 centimetres from the eaves and kept below the ridge, is usually permitted development. In Bournville you will need a full application to Birmingham City Council for a front or side dormer, a box that exceeds the volume, and any dormer in a conservation area such as Bournville Village and Bournville Tenants, where those rights are removed.
The permitted-development limit is a volume, not a footprint: 40 cubic metres of added roof space on a terraced house and 50 on a semi-detached or detached one, and any earlier loft enlargement counts against that total. In Bournville the box must also sit below the ridge and back from the eaves. We measure your roof and calculate the exact volume you have left before drawing. Birmingham City Council is the decision-maker.
Not under permitted development. A dormer on the front roof slope, or one facing a highway, always needs a full application to Birmingham City Council, because it changes how the house reads from the street. Rear box dormers are far more likely to be approved — or to be permitted development outright — which is why almost every Bournville dormer we draw sits on the back slope.
Often, on a terrace or semi. If the dormer or the loft steelwork meets the party wall with your neighbour, the Party Wall etc. Act applies and notice must be served before work starts — separately from Birmingham City Council's planning decision. We flag the party-wall junction on the drawings so a surveyor can be appointed early and the build is not held up. This applies to your Bournville address specifically.
If your dormer is permitted development, a lawful development certificate from Birmingham City Council is council-stamped proof of it — worth holding, because a buyer's solicitor will ask for it when you sell. We prepare and submit the certificate with the same measured drawing pack that shows the box within its volume allowance. This applies to your Bournville address specifically.
We price each Bournville dormer individually, because the roof pitch and the volume left 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 Birmingham City Council approves, and we confirm at the outset whether your box is permitted development or needs an application. Call 020 7864 7245 to start.
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