Dormer loft conversion plans in Windlesham & Chobham

Windlesham & Chobham planning decisions and design rules

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%).

Why a Windlesham & Chobham scheme is judged on Windlesham & Chobham terms

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.

The rear dormer, drawn for Windlesham & Chobham roofs

The box dormer is the workhorse loft, and most of Windlesham & Chobham is built for it — the borough runs to Victorian and earlier houses (14% of 3,220 homes), early postwar houses (12%) and late-1960s and early-1970s houses (12%) 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, and a flat-roofed box across the rear slope is the cheapest cubic metre of full-height space those roofs give up. Surrey Heath Borough Council tests the dormer against Surrey Heath Borough Council's development plan and the design policies it applies to householder applications, 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. 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 the cheeks, the window line and the material are drawn to answer it rather than invite a query.

Where Windlesham & Chobham's streets are protected — Chobham, Church Road, Windlesham and Updown Hill, Windlesham among them — the Class B dormer right is switched off and even a modest rear box needs consent. 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 confirm the designation before the box is sized.