Extension Builder Cost in Gillingham

Building an extension is a significant investment in your Gillingham home. Costs vary considerably based on the type of extension, materials, planning permissions, and structural complexity. Single-storey extensions typically cost less than two-storey additions, whilst materials like brick, timber, and concrete all impact the final price. BizHub365 connects you with qualified local extension builders who understand Gillingham's building regulations and can provide competitive quotes tailored to your project.

Extension Builder Prices in Gillingham

Service	Typical Cost	Unit
Single-storey rear extension (basic, up to 20 sq m)	£3500 – £7500	per project
Single-storey rear extension (mid-range, 20–40 sq m)	£8000 – £15000	per project
Double-storey extension (40–60 sq m)	£18000 – £35000	per project
Conservatory installation (PVCu, 15–20 sq m)	£3000 – £6500	per project
Garage conversion (single, structural modifications)	£5000 – £12000	per project
Loft conversion (basic, 30 sq m)	£6000 – £14000	per project
Building control approval & certification	£400 – £1200	per project
Site preparation & foundations (per sq m)	£200 – £450	per sq m

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

What Affects the Cost?

The main cost drivers for extensions in Gillingham include site complexity (ground conditions, access), extension type and size, structural requirements, building regulations approval, and material quality. Properties in flood-risk areas may require elevated foundations or special considerations. Planning permission—mandatory for most extensions—adds 2–4 weeks and varies by design. Labour costs reflect local Gillingham market rates, materials prices, and whether existing utilities need relocation. Corner plots and properties with easements may require surveying, increasing initial costs.

Money-Saving Tips

Start with a detailed brief to reduce revision costs. Avoid the busiest seasons (spring/early summer) when builders have longer lead times. Plan extensions in phases if budget allows. Use durable, locally-sourced materials where possible. Get multiple fixed-price quotes upfront and check builders include contingency in their estimates.

Frequently Asked Questions

Do I need planning permission for an extension in Gillingham?

Most single-storey rear extensions under 4 metres depth and two-storey extensions under 3 metres qualify for Permitted Development if certain conditions are met. However, listed buildings, conservation areas, and some estate properties require full planning permission. Always check with Medway Council's planning team before starting work. Costs typically range from £200–£800 for permission applications.

How long does a typical extension project take in Gillingham?

A standard single-storey extension (3–4 months) includes design, planning (8–12 weeks), building control approval (2–4 weeks), and construction (8–14 weeks depending on size and weather). Double-storey extensions take 5–7 months. Winter delays and site issues can extend timescales. Discuss realistic timelines with your builder upfront.

What's included in an extension builder's quote?

A comprehensive quote should include foundations, structural work, brickwork/cladding, roof, windows/doors, internal finishes, electrics, plumbing, building control fees, and labour. Ask whether contingency (10–15%) is included for unexpected costs. Always request a detailed breakdown and confirm what's excluded (decorating, kitchen fittings, groundworks beyond the footprint).

Why do extension costs vary so much between builders?

Quotes differ due to labour rates, material suppliers, experience level, subcontractor costs, and project scope interpretation. Established builders with strong reputations often charge more but offer better guarantees. New builders may offer competitive rates. Always get 2–3 quotes; the cheapest isn't always best—check references, insurance, and guarantees included.

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