You can extend a house in Cricklewood, but expect conditions. Parts of five conservation areas reach into it. More than a hundred buildings are listed. The whole area is built on clay that swells and shrinks. The neighbours keep applying anyway, so the council has seen whatever you are planning many times before.
The area has 125 listed buildings. None is Grade I, 10 are Grade II* and 115 are Grade II. Listing protects the inside of a building as well as the outside, so even small changes such as a window, a fireplace or an internal wall need listed building consent on top of any planning permission. Most homes here are not listed. The ones that are come with an extra layer of paperwork that never goes away.
Five conservation areas fall within the area's bounds: Railway Terraces Cricklewood, Priory Road, West End Green, Golders Green Town Centre and Redington Frognall. Inside a conservation area, the council can expect to see plans for changes that would go ahead without permission elsewhere, especially anything visible from the street, and the character of the street counts as much as the floor plan. Mr H. Finch laid out Yew, Ash and Elm Groves behind the Crown in 1880, and the council still cares more about how streets like those look than about anyone's plans for an extra bathroom.
People do alter their homes here, and often. Between April 2024 and June 2026, 1,701 planning applications were lodged in the area, 683 of them in the last twelve months. That figure tells you how many people asked. It says nothing about how many were approved, and there is no reliable count of approvals to quote. It does show that the council is very used to the request.
The ground deserves more thought than the paperwork. The British Geological Survey puts the area's shrink-swell hazard at class 3, and every part of Cricklewood reaches that class. Clay of this kind swells when it is wet and shrinks when it dries, so an extension usually needs deeper foundations than the builder's first quote assumed, and a structural engineer's view early on. That is a cost to plan for. It is no reason to panic. Every postcode here sits on the same clay, which makes it the one planning constraint nobody can appeal.
Three listed buildings in the area are on Historic England's Heritage at Risk register. That means they are in poor condition. Repairs may qualify for grants, and any work on them will be closely watched. None of that affects the owner of an ordinary semi down the road, apart from a neighbour with scaffolding up for a long time.
In practice, a house outside the conservation areas may be able to do smaller jobs such as a modest rear extension without a full application, under the national permitted development rules. Inside a conservation area, or on any listed building, assume you will need to apply. Most homes here are flats, and extending a flat usually involves the freeholder and the council both, with a builder some way down the list. Cricklewood is split between Brent and Barnet, so ask whichever council covers the address whether the street is in a conservation area and whether any extra local restrictions apply. A free search on the right council's planning map takes ten minutes and can save months.
Your freedom to extend in Cricklewood is limited. The heritage rules cover a fair share of the area, the clay affects every plot, and most homes are flats with someone else's name on the freehold.