MCIAT chartered architectural technologists covering Windsor and the wider Berkshire commuter belt from our London base. Planning permission, building regulations, loft conversions, extensions and mansard roofs, 30% below typical London architect rates.
National rules, decided by the Royal Borough of Windsor and Maidenhead. The fee is £548 for a householder application. Much of central Windsor is a conservation area and the castle sits inside a designated setting, so Class A side extensions and cladding are frequently removed.
| Rule or fee | Value | Source |
|---|---|---|
| Householder planning application | £548 | Statutory, England 2026 |
| Lawful development certificate | £274 | Statutory |
| Larger home extension prior approval | £249 | Statutory |
| Rear extension, terrace or semi | 3m, or 6m under prior approval | GPDO 2015, Class A |
| Inside a conservation area | Class A side extensions and cladding removed | GPDO 2015, Article 2(3) |
| Class B roof enlargement in a conservation area | not permitted development | GPDO 2015, Article 2(3) |
| Listed building consent | no fee, criminal offence to skip | Planning (Listed Buildings) Act 1990 |
Sources: the Town and Country Planning (Fees for Applications) (England) Regulations 2012 as amended, 2026 rates; the General Permitted Development (England) Order 2015, Article 2(3) and Schedule 2, Part 1, Classes A and B; the Planning (Listed Buildings and Conservation Areas) Act 1990, section 9. Read at 1 September 2026. Which Windsor streets fall inside the designation is on the council’s own policies map.
Local planning contextHome of the oldest occupied castle in the world, a heavily protected historic town with exceptional tourist footfall.
All householder planning applications in Windsor are determined by Royal Borough of Windsor and Maidenhead. The council follows the National Planning Policy Framework and its own adopted Local Plan, supported by area-specific design guides and Supplementary Planning Documents.
Conservation areas: Windsor Town Centre, Old Windsor, Datchet and Eton are conservation areas. Windsor Castle and the Long Walk are within the Windsor Great Park Grade I registered landscape.
Policy quirks to watch: Heritage controls are unusually tight: views to and from Windsor Castle are protected by designated view corridors, and the Grade I listing of the castle triggers Historic England consultation on many nearby applications. Green Belt covers most of the rural parish.
Typical housing in Windsor includes georgian and Victorian townhouses in the town centre (all within sight of the castle), Edwardian and interwar villas in Dedworth and Clewer, and the large Eton Wick and Ascot fringes of substantial detached homes. This mix drives the types of projects we most often prepare drawings for here.
Five core services, all delivered by MCIAT chartered architectural technologists, all within our 50-mile service radius.
Full planning submission: existing/proposed plans, elevations, site plan, and Design & Access Statement.
Construction-detail drawings for your builder and Building Control submission.
Rear dormer, hip-to-gable, L-shape or mansard loft conversion drawings.
Single-storey, double-storey, wrap-around and side-return extension drawings.
Full mansard conversion drawings with structural and thermal detailing.
Every drawing is signed off by a Chartered Member of the Institute of Architectural Technologists. The same quality bar that applies to our central London projects applies to our Windsor work.
We regularly submit to all M25 commuter-belt councils including Royal Borough of Windsor and Maidenhead. We research each council's Local Plan, design guides and recent decision history before we start drawing.
No mileage charges, no hourly rates, no surprises on the invoice.
Our submissions across the 33 London boroughs and the M25 commuter belt are prepared for council review before submission. This helps reduce avoidable resubmission risk and delay.
Wrap-around extensions and garage conversions on the larger detached houses in Windsor are popular for creating open-plan family kitchens and home offices. These projects often combine planning permission, building regulations approval and structural calculations — all covered within our Complete package.
Sympathetic extensions to listed and historic homes require additional heritage input. For period properties in Windsor, we prepare heritage impact statements, use traditional materials and maintain the original proportions that Royal Borough of Windsor and Maidenhead's conservation officer will expect to see.
Royal Borough of Windsor and Maidenhead application fees are charged separately at the statutory rate.
Planning permission drawings for Windsor.
Planning + building regulations drawings for Windsor.
Complex or listed-building projects in Windsor.
Yes. Windsor is well within our 50-mile service radius from our London office. We cover all Windsor postcodes (SL4) for planning permission drawings, building regulations drawings, loft conversions, house extensions and mansard roofs. Windsor is 23 miles from central London (55 min from London Waterloo), so our team can comfortably visit for measured surveys and pre-application meetings with Royal Borough of Windsor and Maidenhead.
These prices are roughly 30% below typical London architect rates for the same scope of work. Royal Borough of Windsor and Maidenhead application fees are charged separately at the statutory rate (£548 for a householder planning application, £274 for a Lawful Development Certificate in 2026).
Yes, every project includes an in-person measured survey at your property in Windsor. We typically combine the measured survey with an initial brief discussion on site, then return for pre-submission checks if needed. For projects that require pre-application meetings at Royal Borough of Windsor and Maidenhead, we attend on your behalf and include the call or meeting in the fee.
Yes. While our office is in London, our MCIAT chartered architectural technologists regularly submit to councils across the M25 commuter belt, including Royal Borough of Windsor and Maidenhead. We use the Planning Portal for submissions, so the process is identical regardless of which local planning authority handles your application. We research each council's Local Plan, design guides, and recent decision history before preparing your drawings so that the scheme aligns with their current approach.
The statutory target for a householder planning application is 8 weeks from validation. Royal Borough of Windsor and Maidenhead generally meets this target for straightforward applications, although conservation area or listed building consents can take longer. Pre-application advice typically takes 4–6 weeks. From initial instruction to final decision, expect 10–16 weeks for a typical residential project in Windsor.
MCIAT chartered. council-ready drawing review.
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