Can I build a mansard loft conversion in Queen's Park?

Possibly, but it needs planning permission. Queen's Park is a conservation area with Article 4 directions, so roof extensions cannot rely on permitted development, and the council judges the design against its Queen's Park design guide and the roofs on your street. We look at what neighbours have already had approved before drawing anything.

Do I need permission for a side-return extension in Queen's Park?

Yes. Side extensions on conservation area land are not permitted development, and Article 4 directions apply in Queen's Park. A well-designed side-return infill is often acceptable, but it needs an application.

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Areas we cover

Builders in Queen's Park

In Queen's Park we work on late-Victorian and Edwardian houses: rear dormer and mansard loft conversions, side-return and rear extensions, and renovations that keep original features intact.

Planning authority: London Borough of Brent
Postcode districts: NW6, NW10
Our work here: Extensions, loft conversions and renovations

Rear of a London stock-brick terraced house with a slate mansard loft extension and two dormer windows, between neighbouring terraces with plain pitched roofs — AI-generated illustration; not a completed Mirion project.

Our services in Queen's Park

We also take on auctions, bathrooms, design, driveways, kitchens, plumbing & heating, surveys and property development.

Homes in Queen's Park

The streets around Queen's Park were built up after the site of the 1879 Kilburn agricultural show was divided between a public park and housing. The north side of Harvist Road was largely complete by 1899, and so many different builders were involved that roads such as Kempe, Keslake and Chamberlayne have an unusually varied mix of two- and three-storey houses, with bay windows, decorative porches and rear outriggers.

Our Census figures cover Queen's Park, Brondesbury Park and Kensal Green. In 2021, only 40% of households there lived in a whole house and 58% lived in flats, and almost a third of all households lived in flats within converted houses. Where houses are still whole, they are valuable: the median semi-detached sale in the Queen's Park area was about £1.4 million in the year to March 2026.

Typical projects here are a rear dormer or mansard over the main roof and the back addition, an infill extension along the side return, and refurbishment that restores sash windows, cornicing and fireplaces rather than stripping them out.

Planning and practical notes for Queen's Park

Queen's Park is a Brent conservation area, designated in 1986, and it has Article 4 directions, including a non-immediate one. That means some work that would be permitted development elsewhere, such as altering roofs, windows or front gardens, needs planning permission here. Brent's general extensions SPD does not apply; the Queen's Park conservation area design guide does.

Kensal Rise, immediately to the west, is also a conservation area with a non-immediate Article 4 direction, and the council has consulted on extending the Queen's Park boundary, so check the current position for your street. If your home is a flat or maisonette, any extension or loft conversion needs a full planning application, whatever its conservation status, and usually the freeholder's consent too.

Building work in Queen's Park: common questions

: Possibly, but it needs planning permission. Queen's Park is a conservation area with Article 4 directions, so roof extensions cannot rely on permitted development, and the council judges the design against its Queen's Park design guide and the roofs on your street. We look at what neighbours have already had approved before drawing anything.
: Yes. Side extensions on conservation area land are not permitted development, and Article 4 directions apply in Queen's Park. A well-designed side-return infill is often acceptable, but it needs an application.