Housing stock in Westminster
Grade-II stucco terraces, mansion blocks and mews houses — many in conservation areas.
Planning in Westminster
Westminster City Council is one of the strictest in London. Article 4 removes many permitted development rights; expect a full householder application and heritage-officer consultation for anything visible from the street.
Party Wall Act — what to expect
Terraced and mansion-block context means a Party Wall Award is effectively guaranteed, often with two adjoining owners.
Read the Party Wall etc. Act 1996 guide for full detail on notices, timelines and surveyor costs.
Typical costs in Westminster
For a mid-spec 25 m² kitchen extension, all-in (professional fees, planning, party wall, VAT and 12% contingency), expect roughly £140,000 to £210,000. High-spec finishes, structural glazing or a full basement dig-out will push above the top of this range; a smaller side-return can come in under the bottom.
Our calculator applies a 1.18× multiplier automatically for Westminster projects. Get an itemised breakdown in 60 seconds.
Get your Westminster estimateAreas we cover in Westminster
Why homeowners in Westminster pick us
- KYB-verified builders only
- Local Westminster project experience
- Fixed, itemised written quotes
- Full insurance & warranty checks