Not always. Many extensions fall under Permitted Development Rights, but it depends on the size, type, and location of the property.

These are rules that allow certain types of home extensions and improvements without formal planning permission, such as small rear extensions or loft conversions.

Generally, you can build up to within 1 metre of the boundary, but it depends on height and design. Anything closer may require a Party Wall Agreement.

Yes, if your work affects a shared wall or is within 3–6 metres of a neighbouring structure. You may need to serve notice under the Party Wall etc. Act 1996.

Yes. Even if planning permission isn’t required, all extensions must comply with Building Regulations (for structural safety, insulation, drainage, etc.).

Expect £1,500–£2,500 per square metre, depending on location, materials, and complexity.

Often yes, but this depends on the scale and whether services like plumbing or electricity are being disrupted.

Possibly, but usually not until the property is sold. The Valuation Office Agency may reassess your band after significant changes.

Not always legally required, but highly recommended for design quality, planning success, and efficient space use.

Typically 3–6 months for planning & prep, and 2–6 months for construction, depending on scale and approvals. A more specific timescale will be given at the quotation stage.