Rear dormer drawings for Harborne 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 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 box dormer is the workhorse loft, and most of Harborne is built for it — the borough runs to 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 under gabled roofs on the terraces and Moor Pool cottages and hipped 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 Moor Pool conservation-area appraisal protects the estate's cottage detailing, hedges and communal greens against incremental change, so the cheeks, the window line and the material are drawn to answer it rather than invite a query.
Where Harborne's streets are protected — Harborne Old Village and Moor Pool among them — the Class B dormer right is switched off and even a modest rear box 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 box is sized.
Many rear dormers in Harborne 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, with Harborne's Moor Pool controls and heavy HMO demand the recurring constraints on change. 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 Harborne Old Village, Moor Pool and High Street, 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 gabled roofs on the terraces and Moor Pool cottages, this returns a full-height double and en-suite from what was standing-room-only, usually inside the permitted-development volume.
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 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 Harborne dormers come up most often:
Dormer loft drawings for Harborne Old Village's the historic High Street core with its conservation area — volume-checked, set-back-detailed and drawn to Birmingham City Council's guidance.
Dormer loft drawings for Moor Pool's John Sutton Nettlefold's 1908 garden suburb of cottages around a village hall and greens — volume-checked, set-back-detailed and drawn to Birmingham City Council's guidance.
Dormer loft drawings for High Street's Victorian terraces and shopfronts along the main spine — volume-checked, set-back-detailed and drawn to Birmingham City Council's guidance.
Dormer loft drawings for Court Oak's interwar semis on the western fringe towards Quinton — volume-checked, set-back-detailed and drawn to Birmingham City Council's guidance.
Dormer loft drawings for Bearwood edge's dense Edwardian terraces bordering Smethwick — volume-checked, set-back-detailed and drawn to Birmingham City Council's guidance.
Dormer loft drawings for Metchley's 1930s semis near the university and hospital campus — volume-checked, set-back-detailed and drawn to Birmingham City Council's guidance.
Whether a dormer in Harborne 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 Harborne Old Village and Moor Pool, 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 Harborne 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 Harborne 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 Harborne Old Village and Moor Pool, 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 Harborne 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 Harborne 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 Harborne 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 Harborne address specifically.
We price each Harborne 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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