How Much Does a House Extension Cost in Colchester? A Local Guide
If you’re considering a house extension in Colchester, one of the first questions you’ll ask is how much it’s likely to cost. Extension prices can vary significantly depending on the size, design, and complexity of the project, as well as the type of property you own.
In this guide, we explain typical house extension costs in Colchester, what affects pricing, and how homeowners can plan their budget with confidence.
Average House Extension Costs in Colchester
As a general guide, build costs for house extensions in Colchester typically fall within these ranges:
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- Single-storey extension: £1,800 – £2,500 per m²
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- Two-storey extension: £2,000 – £2,800 per m²
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- Complex or wraparound extensions: £2,500 – £3,200+ per m²
These figures usually cover construction work only and may not include planning, design fees, or internal finishes.
Cost by Extension Type
Single-Storey Extensions
Single-storey rear or side house extensions are the most popular choice for Colchester homeowners, often used to create open-plan kitchens or larger living spaces.
Typical cost range:
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- £35,000 – £65,000+
They are generally quicker to build and less complex than multi-storey extensions.
Two-Storey Extensions
Two-storey extensions allow homeowners to add space both upstairs and downstairs, making them ideal for growing families.
Typical cost range:
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- £60,000 – £100,000+
Although more expensive, the cost per square metre can offer better value when creating multiple rooms.
Side Return & Wraparound Extensions
Side return and wraparound extensions are common in period and terraced properties where space is limited.
Typical cost range:
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- £45,000 – £85,000+
These projects often involve more structural work and access considerations, which can increase costs.
What Affects the Cost of a House Extension?
Size & Design
Larger extensions cost more, but design features such as large openings, skylights, or bi-fold doors can also increase the overall budget.
Property Type & Condition
Older properties may require additional groundwork, structural strengthening, or remedial work, which can affect pricing.
Planning & Structural Requirements
Planning permission, building control fees, and structural engineer calculations all add to the total cost and should be budgeted for early.
Internal Finishes
Kitchens, bathrooms, flooring, and bespoke joinery can significantly influence final costs beyond basic build work.
Additional Costs to Consider
Homeowners should also allow for:
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- Architectural drawings
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- Planning application fees
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- Electrical and plumbing upgrades
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- Heating system improvements
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- Redecoration of existing areas
A contingency of 10–15% is recommended to cover unexpected costs.
Do You Need Planning Permission in Colchester?
Some extensions fall under permitted development, while others require planning permission. Properties in conservation areas or with listed status may face additional restrictions.
Seeking advice early can help avoid delays and unexpected costs.
How Long Does a House Extension Take?
Typical build times are:
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- Single-storey extension: 10–14 weeks
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- Two-storey extension: 14–20 weeks
This does not include design or planning stages, which can add several months before construction begins.
Is a House Extension Worth the Cost?
For many homeowners in Colchester, extending is more cost-effective than moving. A well-designed extension can improve everyday living while adding significant value to the property.
Beyond financial value, extensions allow families to stay in an area they enjoy while adapting their home to changing needs.
Getting an Accurate Extension Quote
To receive an accurate quote, builders usually need:
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- Detailed plans or drawings
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- Access to the property
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- Clear information on finishes and layout
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- Understanding of any structural requirements
The clearer the brief, the more accurate the pricing.
Final Thoughts on Extension Costs in Colchester
House extension costs in Colchester vary depending on many factors, but understanding typical price ranges and influencing elements makes planning far easier. Whether you’re adding a single-storey extension or undertaking a larger build, careful budgeting and professional advice are essential.
A house extension is a major investment, but when done properly, it can transform how you live in your home while adding long-term value.