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Can I live in the house during the extension work?Often yes, but this depends on the scale and whether services like plumbing or electricity are being disrupted.
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Do I need planning permission for an extension?Not always. Many extensions fall under Permitted Development Rights, but it depends on the size, type, and location of the property.
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How close can I build to my neighbour’s boundary?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.
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Will the extension increase my council tax band?Possibly, but usually not until the property is sold. The Valuation Office Agency may reassess your band after significant changes.
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What is a Party Wall Agreement and do I need one?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.
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How much does a typical extension cost in the UK?Expect £1,500–£2,500 per square metre, depending on location, materials, and complexity.
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How long does the process take from design to completion?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.
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Do I need an architect?Not always legally required, but highly recommended for design quality, planning success, and efficient space use.
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Do I need building regulations approval?Yes. Even if planning permission isn’t required, all extensions must comply with Building Regulations (for structural safety, insulation, drainage, etc.).
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What are Permitted Development Rights?These are rules that allow certain types of home extensions and improvements without formal planning permission, such as small rear extensions or loft conversions.
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What are CIL and Section 106 charges?Community Infrastructure Levy (CIL) is a charge for infrastructure costs. Section 106 agreements are planning obligations (e.g., affordable housing contributions).
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How do I apply for planning permission?Through your local authority's planning portal. You'll need to submit architectural drawings, site plans, and various assessments (ecology, drainage, etc.).
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What are Building Regulations and inspections?Regulations ensure health, safety, energy efficiency, etc. You’ll need inspections at key stages (foundations, electrics, insulation, etc.).
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Do I need planning permission for a new build?Yes, full planning permission is required for any new dwelling in the UK.
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How long does a new build take?Planning and prep: 6–12 months Construction: 6–18 months, depending on size and weather.
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Do I need an architect or can I use a design & build company?Either option is viable. Design & build can be more streamlined; architects offer more bespoke control.
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Do I need a structural warranty or insurance?Yes. Most lenders and buyers expect a 10-year structural warranty (e.g. NHBC, LABC, Premier Guarantee).
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What is outline vs full planning permission?Outline gives approval "in principle" for development. Full planning provides detailed approval for construction.
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