# Areas we cover

Canonical URL: https://mirion.uk/areas/

> Where Mirion Builders works: extensions, loft conversions and renovations in Brent, Harrow, Barnet, Ealing and Hillingdon, with local planning guides.

Mirion Builders is based in Wembley Park and carries out extensions, loft conversions and renovations across Brent, Harrow, Barnet, Ealing and Hillingdon. Each area guide explains the local housing and the council's planning rules.

We also work in neighbouring parts of these boroughs that don't have their own guide yet, including Kenton, Northwick Park, Preston, Sudbury, Neasden, Kensal Rise, Rayners Lane, South Harrow, Wealdstone and Whetstone. If your street isn't listed, [ask us](https://mirion.uk/contact/).

## Pages

- [Builders in Brent](https://mirion.uk/areas/brent/index.md): Extensions, loft conversions and renovations across Brent, from Wembley to Queen's Park. Brent's 2025 extension rules and conservation areas explained.
- [Builders in Harrow](https://mirion.uk/areas/harrow/index.md): Extensions, loft conversions and renovations in Harrow, from Pinner and Stanmore to Harrow on the Hill, with Harrow's design guide and 30 conservation areas.
- [Builders in Barnet](https://mirion.uk/areas/barnet/index.md): Extensions, loft conversions and renovations in Barnet, from Mill Hill to Hampstead Garden Suburb, under the council's June 2026 extensions guidance.
- [Builders in Ealing](https://mirion.uk/areas/ealing/index.md): Extensions, loft conversions and renovations in Ealing and Hanwell for Victorian, Edwardian and interwar houses, with Ealing's SPD 4 guidance explained.
- [Builders in Hillingdon](https://mirion.uk/areas/hillingdon/index.md): Extensions, loft conversions and renovations in Ruislip, Eastcote, Ickenham and Northwood, with Hillingdon's extension limits and 4-metre Article 4 rule.