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Can you build an extension through a London winter? The real temperature limits for concrete and brickwork, what carries on regardless, a realistic winter programme and what it costs.

A full flat renovation in Chelsea for a client who had just bought the property, bespoke joinery, marble bathrooms, Crittall-style screens, plus 2026 London flat renovation costs and timescales.

Velux, rear dormer, hip-to-gable, L-shaped and mansard loft conversions compared, 2026 West London prices, timescales, planning and how to tell which type your roof can take.

Do you need planning permission from Hillingdon Council for an extension or loft conversion? Permitted development limits, 2026 fees (£548 / £249), timescales, conservation areas and how to apply. By a Hayes-based builder.

A real rear dormer loft conversion with a full en-suite built by GSM Builders Ltd, layout, build spec, 8-week timeline and what the same job costs in West London in 2026.

Choosing a builder is the decision that decides whether your extension or loft conversion is a good experience or a story you tell for years. In West London there is no shortage of firms, a search for “builders Hayes” or “builders Ealing” returns hundreds, but the difference between a good one and a bad one…

If you live in a 1930s semi in Hayes, Ruislip, Hounslow, Greenford or Harrow, the loft conversion you almost certainly need is a hip-to-gable. It is the conversion GSM Builders Ltd builds more than any other, because it is the only way to turn the cramped hipped roof of an inter-war semi into a full-size…

A kitchen extension is the project West London homeowners ask us about more than any other. And the one where the price range is widest, because the room, the glazing and the kitchen itself all vary so much. This guide from GSM Builders Ltd, builders based in Hayes, gives realistic 2026 kitchen extension costs for…

Most garages in West London have not seen a car in years. If yours is full of boxes and bikes, converting it is the cheapest way to add a proper room to your house. No foundations, no roof, no lost garden. This guide from GSM Builders Ltd, builders based in Hayes, sets out realistic garage…

Almost every house in West London shares a wall, a boundary or a foundation line with a neighbour. That means almost every extension, loft conversion or structural alteration in Hayes, Ealing, Hounslow or Harrow triggers the Party Wall etc. Act 1996. It is not as scary as it sounds, but ignoring it can stop a…

“Do I need planning permission?” is the question we are asked at almost every first site visit in West London. The answer is often no, but it depends on what you are building, what kind of house you have and whether your street has extra restrictions. This guide explains the rules as they apply in…

A loft conversion is the most popular way to add a bedroom in West London without giving up any garden. But prices vary enormously depending on the type of conversion and the shape of your roof. This 2026 guide from GSM Builders Ltd sets out realistic costs for Hayes, Hillingdon, Ealing, Hounslow, Harrow and the…