# Builders in Brent Canonical URL: https://mirion.uk/areas/brent/ > Extensions, loft conversions and renovations across Brent, from Wembley to Queen's Park. Brent's 2025 extension rules and conservation areas explained. Mirion Builders is based in Wembley Park and carries out home extensions, loft conversions and renovations across the London Borough of Brent, from 1930s semis around Wembley and Kingsbury to Victorian terraces in Queen's Park and Willesden. Brent is really two places when it comes to housing. The south of the borough, around Kilburn, Queen's Park, Kensal Rise and Willesden, grew in the late Victorian and Edwardian years as the railways arrived, so its streets are lined with terraced and semi-detached houses in London stock brick, many of them now divided into flats. The north, around Wembley, Preston, Kingsbury and Kenton, filled up between the wars after the Metropolitan Railway and the 1924 British Empire Exhibition at Wembley Park, with semi-detached houses that have hipped roofs, bays and front gardens. At the 2021 Census, 43% of Brent's 118,600 households lived in a house \(22% semi-detached, 15% terraced and 6% detached\) and 54% lived in a flat, including flats in converted houses. That mix shapes what is possible. Houses usually keep permitted development rights for lofts and rear extensions, while flats and maisonettes always need planning permission to extend. On interwar semis, the common projects are a hip-to-gable loft conversion with a rear dormer and a single-storey rear kitchen extension. On Victorian terraces, they are rear dormers or mansards, infill extensions along the side return beside the back outrigger, and careful refurbishment of original features. Brent Council is the planning authority. Its [Residential Extensions and Alterations SPD](https://www.brent.gov.uk/planning-and-building-control/planning-policy-and-guidance/supplementary-planning-documents-and-guidance), adopted on 16 January 2025, replaced the 2018 guidance and is unusually specific. For example, it says single-storey rear extensions to terraced and semi-detached homes could be up to 6 metres deep \(8 metres for detached homes\), as long as they take up no more than half the garden. We summarise its rules on our [Brent extensions](https://mirion.uk/areas/brent/extensions/) and [Brent loft conversions](https://mirion.uk/areas/brent/loft-conversions/) pages. The SPD is not intended for conservation areas. Brent has 22, including Barn Hill, Queen's Park, Mapesbury, Roe Green Village, Sudbury Court, Northwick Circle and Wembley High Street, and the council says all of its residential conservation areas are covered by Article 4 directions. These remove some permitted development rights, so work such as altering roofs, windows or front gardens can need planning permission. Each area's map, Article 4 direction and design guide is on the [council's conservation pages](https://www.brent.gov.uk/planning-and-building-control/listed-buildings-and-conservation-areas). Wherever you live, work that affects a party wall needs notice to the neighbours under the Party Wall etc. Act 1996, and structural work needs Building Regulations approval. Around Wembley Stadium, [event-day parking restrictions](https://www.brent.gov.uk/parking-roads-and-travel/parking/wembley-event-day-parking) also affect skips and deliveries. Building work in Brent: common questions Do I need planning permission for an extension in Brent? Not always. Many houses can add a single-storey rear extension under permitted development: up to 3 metres deep on a terraced or semi-detached house, or 4 metres on a detached house, and up to 6 or 8 metres through the prior approval process. Side extensions in conservation areas, anything beyond those limits, and any extension to a flat need planning permission. In Brent's conservation areas, Article 4 directions also remove some permitted development rights, so check before relying on them. How do I find out if my house is in a Brent conservation area? Brent's interactive policies map shows conservation areas and other designations for any address. The council's conservation pages also list each area's map, Article 4 direction and design guide. Do you work across the whole of Brent? Yes. We are based in Wembley Park and take on extensions, loft conversions and renovations throughout the borough, including Wembley, Kingsbury, Kenton, Preston, Sudbury, Neasden, Willesden, Queen's Park, Kensal Rise and Kilburn. - Local planning authority: London Borough of Brent - Postcode districts: HA0, HA9, NW2, NW6, NW9, NW10 - Work Mirion has carried out here: Extensions, loft conversions and renovations ## Pages - [House extensions in Brent](https://mirion.uk/areas/brent/extensions/index.md): Rear, side and side-return extensions in Brent, explained against the council's 2025 extensions SPD: depths, heights, gardens and conservation areas. - [Loft conversions in Brent](https://mirion.uk/areas/brent/loft-conversions/index.md): Hip-to-gable, rear dormer, L-shaped and mansard loft conversions in Brent, with the council's 2025 roof guidance and permitted development limits explained. - [Home renovations in Brent](https://mirion.uk/areas/brent/renovations/index.md): Whole-house renovations in Brent, from 1930s semis to Victorian terraces, including Article 4 rules for windows and doors in conservation areas. - [Builders in Wembley](https://mirion.uk/areas/brent/wembley/index.md): Extensions, loft conversions and renovations in Wembley from a builder based at Wembley Park. Local house types, Brent planning rules and conservation areas. - [Builders in Kingsbury](https://mirion.uk/areas/brent/kingsbury/index.md): Loft conversions, extensions and renovations in Kingsbury, NW9, from Wembley-based Mirion Builders: interwar semis, Roe Green Village and Brent planning rules. - [Builders in Queen's Park](https://mirion.uk/areas/brent/queens-park/index.md): Mansard and dormer lofts, side-return extensions and renovations for Victorian houses in Queen's Park, NW6, with Brent's conservation area and Article 4 rules. - [Builders in Willesden](https://mirion.uk/areas/brent/willesden/index.md): Loft conversions, extensions and renovations in Willesden, Willesden Green and Mapesbury: Victorian houses, flats in converted houses and Brent planning rules.