Woking's lofts split by housing stock. The Edwardian and inter-war semis of Horsell, Maybury and West Byfleet and the 1930s semis of Knaphill, Byfleet and St John's are the usual candidates for a rear dormer, often with a hip-to-gable end, and many can follow the permitted development route. On Hook Heath and in Pyrford the large detached houses on wooded plots have the most roof space, but several sit in conservation areas, where a roof extension needs planning permission. The flats around the station have no householder rights for a loft at all.
The permitted development rules for loft conversions
A loft conversion with a rear dormer is permitted development on a house if the added roof volume is no more than 40 m³ on a terraced house or 50 m³ on a semi-detached or detached house, the dormer sits at least 200 mm back from the eaves and no higher than the ridge, there is no dormer on the roof slope facing the road, materials are similar in appearance, and side windows are obscure-glazed.
Flats and maisonettes have no permitted development rights, so a loft to a top-floor flat always needs planning permission. Full-width box dormers that reach the ridge, and hip-to-gable conversions on semis whose volume exceeds 50 m³, also fall outside the allowance.
What changes in Woking
Roof extensions are not permitted development in a conservation area, so a dormer or hip-to-gable there needs a householder planning application designed to the area's appraisal.
The local constraints that most often decide the route in Woking are listed below, taken from our Woking area page. Each one is a reason to confirm the address on Woking's constraints map before relying on permitted development.
- Green Belt. Green Belt surrounds Woking's urban area, taking in land around Horsell Common, Hook Heath, Pyrford, Byfleet, Brookwood and Mayford. Source
- Thames Basin Heaths Special Protection Area. Horsell Common and the heathland to the north and west of the borough form part of the Thames Basin Heaths Special Protection Area. Source
- Conservation areas. Woking's conservation areas include parts of Horsell, Hook Heath, Byfleet, Pyrford and Brookwood Cemetery. Source
- Article 4 directions. Some areas of the borough have Article 4 directions that remove particular permitted development rights, typically for front alterations, roof works or boundary changes in sensitive residential areas. Source
- Basingstoke Canal, River Wey and Bourne flood risk. The Basingstoke Canal runs through the middle of the borough, the River Wey forms the eastern edge through Byfleet and Pyrford, and the Bourne and Hoe Stream cross the west and south. Source
- Listed buildings. Pyrford, Byfleet, Horsell and Old Woking contain listed houses, churches and farm buildings, and Brookwood Cemetery has many listed structures. Source
What Woking's Design SPD says about dormers
Woking's Design Supplementary Planning Document, adopted in February 2015 and giving detailed guidance under Core Strategy Policy CS21, has a short section headed "Roof extensions and dormers". It says permission will usually be granted for traditional dormer windows that are a subordinate feature of the roofscape, in keeping with the character of the dwelling and the street scene, and that do not affect overlooking.
The same chapter says only modest extensions to the roof will be permitted, so that they do not dominate its form and appearance or alter its character, and that roof forms contrary to the existing roof form will generally be resisted. We therefore draw a rear dormer to sit well within the roof slope rather than filling it, and we keep the window pattern in line with the floors below. The SPD wording on permission for small rear dormers predates the current permitted development rules, so the route is checked against the national limits.
Conservation areas across the borough
Woking Borough Council says there are 27 conservation areas in the borough, with extra national and local controls over development and change, and that appraisals describe each area's character and help guide decisions on new proposals. The Planning Portal's loft guidance is clear that a loft conversion is not permitted development for a house on designated land such as a conservation area, so a dormer there needs a planning application.
The council has been updating the appraisals: in July 2026 it consulted on drafts for Aviary Road in Pyrford, Byfleet Corner and Rosemount Parade with Station Approach in West Byfleet, and Woking town centre. We check the road against the council's conservation area maps and the current appraisal before choosing a route.
What Woking planning officers look for
In the Green Belt officers usually measure the extension against the original dwelling by floorspace or volume and treat outbuildings more strictly. Common refusal reasons are full-width box dormers, side extensions that create a terracing effect, and disproportionate additions in the Green Belt. The council offers a paid pre-application service. Decisions can run past the statutory 8 weeks; allow 8–12 weeks.
Fees and timelines
Woking decides a householder application or a Lawful Development Certificate within 8 weeks of validation. The council fee is £528 for a householder application and £264 for a Lawful Development Certificate (England, from 1 April 2025; verify before applying).
Our own fee is fixed once quoted. The quote tool gives an indicative figure in minutes and a written quote follows within 24 hours.
Primary sources
- Woking Design Supplementary Planning Document (February 2015)
- Woking Borough Council, Design SPD page
- Woking Borough Council, Conservation and heritage
- Woking Borough Council, draft Conservation Area Appraisals (July 2026)
- Planning Portal, Loft conversion (roof extension)
- The Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2: the permitted development limits quoted above.
- Planning Portal: do you need permission: the national guidance and the application service every council accepts.
- Woking Borough Council: planning: the council's own constraints map, validation checklist and pre-application service.
