Builder Costs in Chelmsford
East of England | Prices updated for 2026 | All estimates include labour and materials
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Estimated cost in Chelmsford
£15,960 - £43,320
Single Storey Extension (medium (15-25 sqm))
Typical duration: 6-12 weeks
Builder Prices in Chelmsford
Single Storey Extension
£15,960 - £43,320Labour
£9,120 - £22,800
Materials
£6,840 - £20,520
Typical duration: 6-12 weeks
Garage Conversion
£7,410 - £17,100Labour
£4,560 - £10,260
Materials
£2,850 - £6,840
Typical duration: 2-4 weeks
Internal Wall Removal
£798 - £2,622Labour
£570 - £1,710
Materials
£228 - £912
Typical duration: 1-3 days
Patio Construction
£1,482 - £5,130Labour
£912 - £2,850
Materials
£570 - £2,280
Typical duration: 2-5 days
How Chelmsford Compares
More expensive
Trade prices in Chelmsford are typically 14% above the national average. This reflects local labour rates and the cost of living in East of England.
Seasonal Demand for Builder Work
Peak demand is typically in Jul, with the quietest period around Jan. You may find lower prices and better availability during off-peak months.
What Affects the Price
Single Storey Extension
- Extension size (square metres)
- Foundation type required by ground conditions
- Roof design (flat, pitched, or lean-to)
- Level of internal finish and specification
- Planning permission or permitted development status
Garage Conversion
- Garage size and structural condition
- Level of insulation and damp proofing needed
- Whether plumbing or electrics are required
- Quality of internal finish
Internal Wall Removal
- Whether the wall is load-bearing
- Steel beam size and specification
- Services (pipes, wires) running through the wall
- Making good to floor, ceiling, and adjacent walls
Patio Construction
- Patio area (square metres)
- Material choice (concrete slabs, natural stone, porcelain)
- Ground preparation and levelling
- Drainage and edging requirements
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Frequently Asked Questions
How much does a builder cost in Chelmsford?
Builder prices in Chelmsford typically range from £798 for internal wall removal to £43,320 for single storey extension. Prices include both labour and materials.
What is the average cost of single storey extension in Chelmsford?
Single Storey Extension in Chelmsford costs between £15,960 and £43,320 on average, depending on the scope of work and materials chosen.
When is the cheapest time to hire a builder in Chelmsford?
Demand for builder work in Chelmsford is typically lowest in January. Booking during quieter months may mean better availability and competitive pricing.
Are builder prices in Chelmsford above or below the national average?
Builder prices in Chelmsford are around 14% above the national average, reflecting higher local labour rates and cost of living.
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