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 CIAT - Architectural home extension plans Marlow

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Building Costs.

The art of estimating within a set of defined tolerances. 


estimated building costs MarlowEstimating any building project is not an exact science as each builder has their own pricing strategies and margin allowance which can lead to great variations in their quotations.  This makes estimating budget costs prior to developing the full scheme design very difficult and any estimated costs offered by CHP should only be treated as very approximate and not as the maximum price expected which can only be determined by a tender.

However, from previous experience there are a few common items that can affect your extension building cost:-

1. The cost per square metre is significantly higher for smaller extensions below 30 square metres.

2. Complex schemes and works that affect the existing structure will increase the total building costs of the extension.

3. Bad ground conditions, trees and hedgerows etc. can lead to deep foundations and a specially designed ground floor structure.

It has been my experience that current building costs for extensions generally range from £1,500 to £2,000 per square metre plus VAT and other lump sums for appliances and fittings.  We are currently in a min-boom market for building works and building costs have risen substantially over the last 2 years.  Many good builders are also very busy and you may even experience difficulty in obtaining a builder that can start your project shortly after Building Regulation Approval.

When calculating the area of the extension for budgeting purposes it is wise to use external measurements for each floor - not just the footprint area created.




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Work Areas                 

Architectural and Building Design Services - for planning permission and building regulations within Marlow, High Wycombe, Maidenhead, Bucks, Berks and Oxon areas.

Residential development for household extensions, conversions and new dwellings.

Measured surveys and roof inspection reports. Drawing plans on cad and specifications for planning permission, planning consent, planning approval, local authority approvals, building surveys and party wall act.

Chartered Architectural Technologists belong to CIAT (the Chartered institute of Architectural Technologists).

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