Hayes
Hayes (UB3/UB4) sits in the London Borough of Hillingdon, which decides all planning applications. Many extensions and loft conversions are permitted development, but conservation areas, a borough-wide HMO Article 4 Direction, and design rules can require formal consent, so always check before you build.
Hayes is an established urban district in the London Borough of Hillingdon, served by Hayes & Harlington station on the Elizabeth line with direct, fast links to London Paddington. Sevda Kucuk, an Architectural Technologist with 17 years of experience and a 90% planning approval rate, leads every AVA Home Design project. We prepare the drawings and applications that go to Hillingdon's planning service, for house extensions, loft and garage conversions, outbuildings and HMOs.
Hayes was EMI territory, and the Old Vinyl Factory site now sits at the centre of a long regeneration. Demand here runs to family homes and shared housing in roughly equal measure, both of them within reach of the Elizabeth line. We handle the design and the planning detail, from a permitted development check through to a full application.
Local planning notes
- Hayes lies within the London Borough of Hillingdon, the local planning authority that determines all householder and HMO applications for UB3 and UB4 addresses.
- Hillingdon made an Article 4 Direction removing permitted development rights for converting a dwelling (Use Class C3) to a small HMO (Use Class C4), now applying borough-wide; it came into immediate effect on 11 December 2025, so HMO conversions in Hayes need planning permission.
- Conservation areas in and around Hayes include the Hayes Village Conservation Area and The Old Vinyl Factory (Botwell) Conservation Area, where tighter controls apply to alterations and some permitted development rights are restricted.
- Hayes is a largely urban area well connected by the Elizabeth line at Hayes & Harlington station, with regeneration such as The Old Vinyl Factory driving demand for new homes and conversions.
- As an established built-up area, most of Hayes is not Green Belt, so typical householder extension constraints relate to design, neighbour amenity and any conservation area or Article 4 designation rather than Green Belt policy.
Services in Hayes
- House ExtensionsRear, side, wraparound and double-storey. From concept to build-ready drawings.
- Loft ConversionsDormer, L-shaped and mansard. The top floor people forget they own.
- HMOs & ConversionsFlat conversions and HMO design optimised for yield and compliance.
- Garage ConversionsThe most cost-effective extra room your house already has.
- OutbuildingsStudios, gyms, offices. Permitted development specialists.
- Planning ApplicationsHigh success rate across 12 London and Home Counties councils.
Frequently asked questions
- Do I need planning permission in Hayes?
- It depends on the works and your property. Many single-storey rear extensions, loft conversions and outbuildings in Hayes fall under permitted development, but if your home is in a conservation area, has had rights removed, or you are creating an HMO, you will likely need a formal application to the London Borough of Hillingdon. We assess your address first and advise on the correct route.
- Can I convert my Hayes house into an HMO without planning permission?
- No longer in most cases. Hillingdon's borough-wide Article 4 Direction, in effect from 11 December 2025, removed the permitted development right to convert a dwelling (C3) into a small HMO (C4) for three to six unrelated occupants. You now need planning permission across Hayes, and we can prepare and manage that HMO application for you.
- What if my property is in a Hayes conservation area?
- If your home falls within the Hayes Village or Old Vinyl Factory (Botwell) Conservation Area, extra controls apply and some permitted development rights are restricted, meaning extensions, alterations and outbuildings often need formal consent. Designs are expected to respect local character. We prepare conservation-aware drawings and the supporting documents Hillingdon requires for these sensitive areas.