Extension Builder Cost in Marlborough

Building an extension in Marlborough involves multiple factors that influence overall cost: project complexity, materials, site access, planning requirements, and local labour rates. Prices vary considerably depending on whether you're adding a single-storey structure or a more complex multi-level design. BizHub365 connects Marlborough homeowners with qualified, local extension builders who can provide transparent quotes and manage your project from start to finish.

Extension Builder Prices in Marlborough

Service	Typical Cost	Unit
Single-storey extension (per square metre)	£900 – £1400	per m²
Two-storey extension (per square metre)	£1200 – £1800	per m²
Site survey and structural assessment	£300 – £600	per job
Planning and building control drawings	£400 – £800	per job
Labour only (skilled builder)	£60 – £120	per hour
Project management and supervision	£50 – £100	per hour
Groundworks and foundations	£2500 – £5000	per job
Roof installation (pitched, per square metre)	£80 – £150	per m²

Prices are indicative averages for Marlborough. Actual quotes will vary based on job specifics.

What Affects the Cost?

Key factors affecting extension building costs in Marlborough include site accessibility, ground conditions, existing property age and construction type, and distance to material suppliers. Planning permission complexity and building regulation requirements in the Wiltshire area can add time and expense. Material availability and specialist trades (electricians, plumbers, roofers) hired as subcontractors also influence final costs. Labour availability during peak seasons may push rates higher.

Money-Saving Tips

Obtain multiple quotes from local builders to compare pricing and expertise. Plan extensions during off-peak seasons (autumn/winter) for better rates. Use locally-sourced materials where possible to reduce transport costs. Ensure detailed specifications upfront to avoid costly changes mid-project, and consider phased builds if budget is tight.

Frequently Asked Questions

What is the typical cost for a 20m² single-storey extension in Marlborough?

A 20m² single-storey extension typically costs £18,000–£28,000 (at £900–£1,400 per m²). This includes foundations, walls, roof, basic finishes, and labour. Costs vary based on ground conditions, design complexity, and finish quality. Planning and building control fees (usually £300–£500) are additional.

Do I need planning permission for an extension in Marlborough?

Most extensions under Permitted Development Rights don't require planning permission, but you'll still need Building Regulation approval (typically £300–£600). Larger projects, two-storey additions, or those exceeding height limits do require planning permission (£200–£400 application fee). Your builder should advise on your specific situation.

How long does an extension project typically take?

A 20m² single-storey extension usually takes 8–12 weeks from groundworks to completion. Two-storey projects take 14–20 weeks. Timescales depend on weather, ground conditions, material delivery, and whether structural works are needed. Building Regulation inspections add 1–2 weeks.

What's included in the quoted price, and what costs extra?

A typical quote includes labour, basic materials (bricks, timber, concrete), and preliminaries. Extras often include utilities disconnection/reconnection, specialist finishes, upgrades to fixtures, unforeseen structural repairs, and professional fees. Always get a detailed breakdown in writing before work starts.

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