Hip-to-gable + dormer loft in Hayes

Which postcode districts around Hayes do we cover for loft conversions work?

Every Hayes postcode district we draw in, the stock that dominates it and the authority that validates a loft conversions there. Hayes fees below are the statutory England rates for 2026, not loft conversions estimates.

What changes about a loft conversions in each part of Hayes?

Roof pitch, wall build-up and plot depth change every few Hayes streets, and each one changes what a loft conversions can achieve at that address.

• Hayes (UB3, UB4) — 1930s semi-detached, post-war defines Hayes, where 1930s semi-detached, post-war estates set what a loft conversions can do. The 1930s hipped roof here needs a hip-to-gable before a rear dormer works across UB3. Any Hayes loft conversions is validated by Hillingdon Council, with Hayes & Harlington the usual Hayes reference point on the site plan.
• Near Hayes: Eastcote (HA5) — a loft conversions in Eastcote starts from 1930s semi-detached, and Eastcote reads as 1930s semi-detached. The 1930s hipped roof here needs a hip-to-gable before a rear dormer works in HA5. Hillingdon Council assesses Eastcote loft conversions against its own Eastcote character guidance, and the location plan we draw for Eastcote references Eastcote Tube.
• Near Hayes: Hillingdon (UB10) — 1930s semi-detached, post-war defines Hillingdon, where 1930s semi-detached set what a loft conversions can do. The 1930s hipped roof here needs a hip-to-gable before a rear dormer works across UB10. Any Hillingdon loft conversions is validated by Hillingdon Council, with Hillingdon Tube the usual Hillingdon reference point on the site plan.
• Near Hayes: Uxbridge (UB8) — loft conversions work in Uxbridge means georgian fragments, 1930s semi-detached, post-war flats. Uxbridge is Georgian centre, 1930s residential. Georgian roofs here are shallow and often behind a parapet throughout UB8. Hillingdon Council decides the Uxbridge application, and Uxbridge High Street anchors the Uxbridge location plan.
• Near Hayes: Ruislip (HA4) — 1930s semi-detached, Tudor fragments defines Ruislip, where 1930s semi-detached, tudor cottages set what a loft conversions can do. The 1930s hipped roof here needs a hip-to-gable before a rear dormer works across HA4. Any Ruislip loft conversions is validated by Hillingdon Council, with Ruislip Lido the usual Ruislip reference point on the site plan.
• Near Hayes: Northwood (HA6) — 1930s detached and semi-detached defines Northwood, where 1930s detached, edwardian villas set what a loft conversions can do. Edwardian roofs run deeper front-to-back across HA6. Any Northwood loft conversions is validated by Hillingdon Council, with Northwood Hills the usual Northwood reference point on the site plan.
• Near Hayes: West Drayton (UB7) — loft conversions work in West Drayton means 1930s semi-detached, post-war. West Drayton is 1930s semi-detached. The 1930s hipped roof here needs a hip-to-gable before a rear dormer works throughout UB7. Hillingdon Council decides the West Drayton application, and West Drayton station anchors the West Drayton location plan.

What local planning policy applies to a loft conversions in Hayes?

Hayes conservation designations: there are 29 across Hillingdon Council, Ickenham, Uxbridge, Ruislip Village among them. Designation costs a Hayes owner the permitted-development route: a loft conversions then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Uxbridge is the Hayes designation that most often changes a loft conversions design.

Article 4 and your Hayes loft conversions: Hillingdon Council has made no borough-wide direction, so permitted development for a loft conversions in Hayes generally survives outside Hayes conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a UB3 owner records that a loft conversions was lawful.

Hayes housing stock: 1930s semi-detached dominates; Metropolitan Green Belt covers much of north Hillingdon; Victorian cottages in Uxbridge and Ruislip villages; post-war housing near Heathrow. Largest outer west London borough; significant Green Belt; Heathrow noise contours affect planning decisions in Harmondsworth and Sipson. Read that before choosing a loft conversions route in Hayes — construction, not postcode, sets what is achievable.

Who decides a loft conversions on the edge of Hayes?

• Harrow — adjoining Hayes, with 29 conservation areas centred on HA1. A loft conversions on the far side of the Hayes line is determined by Harrow Council, so the Hayes quote for loft conversions is checked against Harrow guidance before it is issued.
• Ealing — cross the Hayes boundary and Ealing Council takes the loft conversions instead, applying 30 conservation areas of its own around W3. We re-price loft conversions at the Hayes edge because Ealing policy and Hillingdon policy rarely align on loft conversions depth.
• Hounslow — adjoining Hayes, with 30 conservation areas centred on W3. A loft conversions on the far side of the Hayes line is determined by Hounslow Council, so the Hayes quote for loft conversions is checked against Hounslow guidance before it is issued.

Sources for this Hayes loft conversions page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.