
Rear dormer drawings for Reigate & Banstead roofs — the box across the back slope that turns a low attic into a full-height room, drawn to Reigate & Banstead Borough Council's guidance and the volume limits, delivered in days and revised free until your decision, with a free approval-odds check first.
Reigate & Banstead Borough Council granted 87% of the householder planning decisions it made in its latest published year — level with the 87% England-wide householder average. A double landscape constraint applies in the south, combining Metropolitan Green Belt with the Surrey Hills Area of Outstanding Natural Beauty, which is where a policy-literate drawing pack earns its keep. Its dominant Victorian (1837–1901), Edwardian (1901–1910), interwar (1918–1939) and postwar (1945–1970) 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 Reigate & Banstead Borough Council needs a full application. Reigate & Banstead carries at least one Article 4 direction, and conservation areas including Reigate, Redhill and Banstead Village remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Reigate & Banstead is determined against an 8-week statutory target.
Reigate (historic market town with Victorian and Edwardian conservation cores), Redhill (a Victorian railway-junction town with postwar and new-build regeneration), Banstead (low-density 1930s interwar semis around a village core), Horley (a southern town of postwar and ongoing new-build estates), Merstham (Victorian terraces alongside the postwar New Merstham estates) and Nutfield (a rural village in the Green Belt and Surrey Hills setting) — these are the Reigate & Banstead pockets our drawings cover most. Heritage designations here include Reigate, Redhill, Banstead Village, Reigate Heath, Nutfield and Merstham. Reigate & Banstead Borough Council weighs each proposal against the Reigate & Banstead Core Strategy (adopted 2014) and Development Management Plan (adopted 2019), where the 2019 Development Management Plan released nine Green Belt sites as sustainable urban extensions for around 845 homes, a notable managed release. Flats are a meaningful share of stock in the Redhill and Reigate town centres and at Merstham, and converted flats hold no householder permitted-development rights.. On roofs the borough is pitched clay and concrete-tile gabled and hipped roofs on the interwar semis and steeper tiled roofs on the Victorian mansions of Reigate Hill and Wray Common, over Victorian and Edwardian streets in Reigate and around Redhill's railway junction, abundant low-density 1930s interwar semis in Banstead, postwar and modern estate housing in Redhill, Horley and Merstham and village vernacular in the rural Green Belt and Surrey Hills settlements.
The box dormer is the workhorse loft, and most of Reigate & Banstead is built for it — the borough runs to Victorian and Edwardian streets in Reigate and around Redhill's railway junction, abundant low-density 1930s interwar semis in Banstead, postwar and modern estate housing in Redhill, Horley and Merstham and village vernacular in the rural Green Belt and Surrey Hills settlements under pitched clay and concrete-tile gabled and hipped roofs on the interwar semis and steeper tiled roofs on the Victorian mansions of Reigate Hill and Wray Common, and a flat-roofed box across the rear slope is the cheapest cubic metre of full-height space those roofs give up. Reigate & Banstead Borough Council tests the dormer against the Reigate & Banstead Core Strategy (adopted 2014) and Development Management Plan (adopted 2019), 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. A double landscape constraint applies in the south, combining Metropolitan Green Belt with the Surrey Hills Area of Outstanding Natural Beauty, so the cheeks, the window line and the material are drawn to answer it rather than invite a query.
Where Reigate & Banstead's streets are protected — Reigate, Redhill, Banstead Village, Reigate Heath, Nutfield and Merstham among them — the Class B dormer right is switched off and even a modest rear box needs consent. An Article 4 direction in force from February 2026 removes the permitted right to change ground-floor commercial units to residential across the borough's town and local centres, protecting retail and services frontages. We confirm the designation before the box is sized.

Many rear dormers in Reigate & Banstead are permitted development, but the volume and position decide it. You will normally need a full application to Reigate & Banstead Borough 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 Reigate & Banstead Borough Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Reigate & Banstead grants a fair share of householder applications broadly at the national norm, higher than the most heavily green-belted Surrey neighbours, with the AONB and Green Belt the main constraints in the south. 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 Reigate, Redhill and Banstead, 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 pitched clay and concrete-tile gabled and hipped roofs on the interwar semis, this returns a full-height double and en-suite from what was standing-room-only, usually inside the permitted-development volume.
The 2019 Development Management Plan released nine Green Belt sites as sustainable urban extensions for around 845 homes, a notable managed release. 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 Reigate & Banstead Borough 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 Reigate & Banstead dormers come up most often:
Dormer loft drawings for Reigate's historic market town with Victorian and Edwardian conservation cores — volume-checked, set-back-detailed and drawn to Reigate & Banstead Borough Council's guidance.
Dormer loft drawings for Redhill's a Victorian railway-junction town with postwar and new-build regeneration — volume-checked, set-back-detailed and drawn to Reigate & Banstead Borough Council's guidance.
Dormer loft drawings for Banstead's low-density 1930s interwar semis around a village core — volume-checked, set-back-detailed and drawn to Reigate & Banstead Borough Council's guidance.
Dormer loft drawings for Horley's a southern town of postwar and ongoing new-build estates — volume-checked, set-back-detailed and drawn to Reigate & Banstead Borough Council's guidance.
Dormer loft drawings for Merstham's Victorian terraces alongside the postwar New Merstham estates — volume-checked, set-back-detailed and drawn to Reigate & Banstead Borough Council's guidance.
Dormer loft drawings for Nutfield's a rural village in the Green Belt and Surrey Hills setting — volume-checked, set-back-detailed and drawn to Reigate & Banstead Borough Council's guidance.
Whether a dormer in Reigate & Banstead 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 Reigate & Banstead Borough 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 Reigate and Redhill, Class B dormer rights are removed and every dormer needs a full application.
A fixed process built around how Reigate & Banstead Borough Council validates and decides dormer applications — most drawings are submission-ready within seven days of survey.
Send us your Reigate & Banstead 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 Reigate & Banstead Borough 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 Reigate & Banstead Borough Council's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until Reigate & Banstead Borough 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 Reigate & Banstead you will need a full application to Reigate & Banstead Borough Council for a front or side dormer, a box that exceeds the volume, and any dormer in a conservation area such as Reigate and Redhill, 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 Reigate & Banstead 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. Reigate & Banstead Borough 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 Reigate & Banstead Borough 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 Reigate & Banstead 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 Reigate & Banstead Borough 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.
If your dormer is permitted development, a lawful development certificate from Reigate & Banstead Borough 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.
We price each Reigate & Banstead 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 Reigate & Banstead Borough 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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Same fixed quotes, same fast drawings — wherever your project is.