Dormer, hip-to-gable and mansard loft conversion drawings for Windlesham & Chobham homes — prepared to Surrey Heath Borough Council's design guidance, delivered in days and revised free until your decision lands, with a free approval-odds score first.
Surrey Heath Borough Council granted 87% of the householder planning decisions it made in its latest published year — level with the 87% England-wide householder average. Windlesham & Chobham contains Chobham, Church Road, Windlesham, Updown Hill, Windlesham conservation areas (Chobham designated 1972), so materials, fenestration and roof form are assessed against the appraisal, which is where a policy-literate drawing pack earns its keep. Its dominant Victorian (1837–1901) and postwar (1945–1970) 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. In conservation areas such as Chobham, Church Road, Windlesham and Updown Hill, Windlesham those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in Windlesham & Chobham is determined against an 8-week statutory target.
Chobham (conservation area designated in 1972), Church Road, Windlesham (conservation area designated in 1989), Updown Hill, Windlesham (conservation area designated in 1989), Chobham (civil parish within Windlesham & Chobham) and Windlesham (civil parish within Windlesham & Chobham) — these are the Windlesham & Chobham pockets our drawings cover most. Heritage designations here include Chobham, Church Road, Windlesham and Updown Hill, Windlesham. Surrey Heath Borough Council weighs each proposal against Surrey Heath Borough Council's development plan and the design policies it applies to householder applications, where the 3,220 homes here are 14% pre-1900, 12% 1945-1954, 12% 1965-1972, which is what sets the realistic roof and rear-projection options. On roofs the borough is steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and simple gabled and hipped roofs typical of early postwar building, over Victorian and earlier houses (14% of 3,220 homes), early postwar houses (12%) and late-1960s and early-1970s houses (12%).
What is permitted in Windlesham & Chobham turns on designation first, so that is where we start: Chobham (conservation area designated in 1972), Church Road, Windlesham (conservation area designated in 1989) and Updown Hill, Windlesham (conservation area designated in 1989). Inside those boundaries permitted development is curtailed and Surrey Heath Borough Council assesses materials, window detail and roof form against the area's own appraisal, so a scheme that would be waved through two streets away can need a full application here.
Beyond the designated areas, Windlesham & Chobham takes in Chobham and Windlesham. No Article 4 direction is recorded for Surrey Heath Borough Council, but Windlesham & Chobham's 3 conservation areas still limit permitted development on those streets.
On stock, Windlesham & Chobham is Victorian and earlier houses (14% of 3,220 homes), early postwar houses (12%) and late-1960s and early-1970s houses (12%) — which is why steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and simple gabled and hipped roofs typical of early postwar building govern what a loft or rear projection can realistically be. Surrey Heath Borough Council decided 435 householder applications in the latest published year and granted 87%, with 68% issued inside the eight-week target. We draw to that record rather than to a national average.
The full build-period split for Windlesham & Chobham runs pre-1900 14% (460 homes), 1900-1918 10% (310 homes), 1919-1929 5% (160 homes), 1930-1939 7% (240 homes), 1945-1954 12% (400 homes), 1955-1964 8% (250 homes), 1965-1972 12% (380 homes), 1973-1982 6% (190 homes), 1983-1992 10% (310 homes), 1993-1999 4% (140 homes) and 2000-2008 4% (120 homes). That distribution is why pre-1900 detailing dominates the drawings here, and it is measured from council-tax records rather than assumed from the street name.
Surrey Heath Borough Council also decides for Bagshot, so a decision in Windlesham & Chobham sits inside a wider pattern of decisions we track across the same authority — useful when an officer cites a precedent from the next area over.
Published figures for Windlesham & Chobham and Surrey Heath Borough Council. These are the numbers that decide what is realistic on your street, so we work from them rather than from national averages.
| Measure | Windlesham & Chobham |
|---|---|
| Dwellings recorded | 3,220 |
| Built pre-1900 | 460 (14%) |
| Built 1900-1918 | 310 (10%) |
| Built 1919-1929 | 160 (5%) |
| Built 1930-1939 | 240 (7%) |
| Built 1945-1954 | 400 (12%) |
| Built 1955-1964 | 250 (8%) |
| Built 1965-1972 | 380 (12%) |
| Built 1973-1982 | 190 (6%) |
| Built 1983-1992 | 310 (10%) |
| Built 1993-1999 | 140 (4%) |
| Built 2000-2008 | 120 (4%) |
| Built before 1919 | 24% |
| Built 1919–1939 | 12% |
| Built 1945–2008 | 56% |
| Conservation areas in Windlesham & Chobham | 3 (Chobham, Church Road, Windlesham…) |
| Conservation areas district-wide | 11 |
| Article 4 directions recorded | 0 |
| Householder applications decided | 435 |
| Householder applications granted | 87% |
| Decided within 8 weeks | 68% |
Dwelling stock from VOA council-tax data at 31 March 2025; conservation-area and Article 4 counts from planning.data.gov.uk (MHCLG); decision figures are Surrey Heath Borough Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
Windlesham & Chobham's roofs set the brief. The borough is built largely from Victorian and earlier houses (14% of 3,220 homes), early postwar houses (12%) and late-1960s and early-1970s houses (12%), and its lofts sit under steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and simple gabled and hipped roofs typical of early postwar building — the geometry that decides whether a rear dormer, a hip-to-gable or a mansard gives you the headroom you want. Surrey Heath Borough Council assesses loft proposals against Surrey Heath Borough Council's development plan and the design policies it applies to householder applications, and its case officers read each roof against the pair next door and the wider street before they read the plans.
That makes drawing quality decisive. We measure ridge and eaves heights, roof pitch and the existing stair, calculate the added volume against the permitted-development limits exactly, and show the workings on the drawings so Surrey Heath Borough Council can verify them. Windlesham & Chobham contains Chobham, Church Road, Windlesham, Updown Hill, Windlesham conservation areas (Chobham designated 1972), so materials, fenestration and roof form are assessed against the appraisal, so we resolve it on the page rather than leave it for the case officer to raise.
Windlesham & Chobham also carries protected streets — Chobham, Church Road, Windlesham and Updown Hill, Windlesham among them. No Article 4 direction is recorded for Surrey Heath Borough Council, but Windlesham & Chobham's 3 conservation areas still limit permitted development on those streets. We check your address against those designations before a line is drawn.
Many Windlesham & Chobham loft conversions proceed without planning permission — a rear dormer within the permitted-development volume limits (40 cubic metres on a terrace, 50 on a semi or detached house) is usually lawful. You will normally need a full application to Surrey Heath Borough Council if any of these apply:
We draw the roof line, the ridge height and the neighbour's daylight on the page — the relationships Surrey Heath Borough Council's officers check first — and submit a validation-complete pack, whether that is a lawful development certificate or a full householder application.
Below is Surrey Heath Borough Council's real householder decision record, pulled from official planning statistics and updated as new data lands. Surrey Heath Borough Council granted 87% of its householder applications in the year to 31 March 2026, and Chobham shapes what is approved here. Professionally prepared loft drawings anticipate those pressure points before submission, which is why complete, policy-literate packs are decided faster and refused less often than DIY applications.
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 Chobham, Church Road, Windlesham and Updown Hill, Windlesham, the recurring loft is the rear dormer — a box across the back roof slope that turns a cramped attic into a full-height double bedroom and en-suite. On steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building, that is usually the most efficient use of the roof; where the stock is simple gabled and hipped roofs typical of early postwar building, a hip-to-gable followed by a rear dormer unlocks far more space, though it needs a full application.
The 3,220 homes here are 14% pre-1900, 12% 1945-1954, 12% 1965-1972, which is what sets the realistic roof and rear-projection options. We draw the dormer inside the volume allowance, keep the flat-roof build-up below the ridge, and set the face back from the eaves as the rules require — so the pack answers Surrey Heath Borough Council's questions before they are asked. Where permitted-development rights are exhausted or removed, we prepare a householder application composed to the borough's roof-alteration guidance instead.
We draw loft conversions on every street in the borough. A few of the neighbourhoods where Windlesham & Chobham roofs come up most often:
Loft conversion drawings for Chobham's conservation area designated in 1972 — measured, volume-checked and drawn to Surrey Heath Borough Council's guidance.
Loft conversion drawings for Church Road, Windlesham's conservation area designated in 1989 — measured, volume-checked and drawn to Surrey Heath Borough Council's guidance.
Loft conversion drawings for Updown Hill, Windlesham's conservation area designated in 1989 — measured, volume-checked and drawn to Surrey Heath Borough Council's guidance.
Loft conversion drawings for Chobham's civil parish within Windlesham & Chobham — measured, volume-checked and drawn to Surrey Heath Borough Council's guidance.
Loft conversion drawings for Windlesham's civil parish within Windlesham & Chobham — measured, volume-checked and drawn to Surrey Heath Borough Council's guidance.
The right loft in Windlesham & Chobham depends on your roof. This is how the main types compare on planning route and the space they add.
| Loft type | Permitted development? | Space & headroom | What Surrey Heath Borough Council checks |
|---|---|---|---|
| Rear dormer | Usually yes, within volume limits | Full-height double room at the back | Volume, set-back from eaves, ridge height |
| Hip-to-gable | No — full application | Extends the whole side of the roof | Roof bulk and the symmetry of the pair |
| Mansard | No — full application | Maximum floor area across the roof | Street character, especially in conservation areas |
| Rooflights only | Usually yes (Class C) | Light and headroom, no extra footprint | Whether rooflights sit within the existing slope |
Route depends on your street — conservation areas such as Chobham and Church Road, Windlesham and Article 4 directions can remove permitted-development rights.
A fixed process built around how Surrey Heath Borough Council validates and decides householder loft applications — most drawings are submission-ready within seven days of survey.
Tell us your Windlesham & Chobham postcode and roof type. We confirm your conservation and Article 4 status, how much permitted-development volume you have left, and score your odds against live Surrey Heath Borough Council decisions.
We measure ridge and eaves heights, roof pitch, joist levels and the existing stair — the numbers the volume calculation and head heights depend on.
Chartered designers develop the dormer, hip-to-gable or mansard to your brief, drawn inside the Class B limits or to Surrey Heath Borough Council's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until Surrey Heath Borough Council issues its decision.
Often not. A rear dormer within 40 cubic metres on a terrace, or 50 on a semi-detached or detached house, set back from the eaves and no higher than the ridge, is usually permitted development. In Windlesham & Chobham the main exceptions are hip-to-gable conversions, dormers visible from the highway, and homes in conservation areas such as Chobham and Church Road, Windlesham or on streets with an Article 4 direction. Surrey Heath Borough Council is the decision-maker.
Generally no. In conservation areas including Chobham and Church Road, Windlesham, Class B permitted-development rights for lofts are removed, so a rear dormer that would be lawful elsewhere needs a full application to Surrey Heath Borough Council. No Article 4 direction is recorded for Surrey Heath Borough Council, but Windlesham & Chobham's 3 conservation areas still limit permitted development on those streets. We check your exact address before drawing.
On steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building, common across Windlesham & Chobham, a rear dormer is usually the most efficient conversion and often permitted development. Where the roof is simple gabled and hipped roofs typical of early postwar building, a hip-to-gable followed by a rear dormer gains far more usable space but needs planning permission. Our survey confirms which your roof supports before we draw. Surrey Heath Borough Council is the decision-maker.
A householder planning application in Windlesham & Chobham runs to a statutory eight-week target, and a lawful development certificate to eight weeks as well, though validation can add time if the pack is incomplete. We submit validation-complete drawings and manage case-officer queries to keep the decision on track. Surrey Heath Borough Council is the decision-maker.
If your dormer is permitted development, a lawful development certificate from Surrey Heath Borough Council is council-stamped proof of that — worth having, because every buyer's solicitor will ask for it when you sell. We prepare and submit the certificate application with the same drawing pack. This applies to your Windlesham & Chobham address specifically.
Every roof is different, so we quote each Windlesham & Chobham project individually — a fixed, no-obligation price back within one working day. The quote covers the full drawing pack with free revisions until Surrey Heath Borough Council approves, and we tell you upfront whether your loft qualifies as permitted development. Call 020 7864 7245 to start.
Answer five quick questions and get a free planning score for your exact address — instantly. Then, if you want the full picture, unlock the detailed analysis: your council's live approval rates, local precedents, constraints on your street and a step-by-step route to permission.
Same fixed quotes, same fast drawings — wherever your project is.