£1,260 and £1,680 per square meter.
Extensions are more expensive: RICS gives a guide cost of between £1,260 and £1,680 per square metre for an extension with plastered finish. So a 20-square metre single-storey extension will range from £25,200 to £33,600 – before you've put down flooring or installed a kitchen. 1 Side extensions must be single storey with a maximum height of 4m. 2  If the extension is within 2m of a boundary, the maximum eaves height should be no higher than 3m. 3  A single-storey extension must not extend beyond the rear of the house by more than 3m for an attached house or 4m if the house is detached. NEXT STEP. Find out how much your project will cost. Provide a few details about your project and receive competitive quotes from local pros. The average national cost of adding a room or building an addition is $40,960, with most homeowners spending between $21,711 and $63,014. This data is based on actual project costs as reported by HomeAdvisor members House Extension Costs Calculator. The current uncertainty in the housing market has caused an upsurge in the number of house extensions being built. Adding a bedroom to a house is an almost certain way of increasing the value of a property beyond the cost of having the work done. Whatprice provide a useful cost calculator (below), or better still why not use our FREE quotation service to get an accurate cost for building an extension. With the extension cost calculator you can get a quick, free, rough estimate of at least some of the costs involved in building extra room(s) for your house Extension Costs .co.uk is a UK building quote comparison site, with an ever growing national database of building contractors who have all been recommended for their quality of workmanship. We have ties with many areas of the trade from housing developers to builders, conservatory installers and even paving companies.  So, for your 4 x 5m extension, the build cost would be roughly £24,000. + Add on 10-15% for professional fees (architect, planning application, building regs, structural engineer). + VAT. Single storey extension = £32,000. As a rule of thumb you can add 50% extra to the build cost of a single storey extension. So, £24,000 +50% = £36,000. + Add on 10-15% for professional fees (architect, planning application, building regs, structural engineer). + VAT The best way to find out the cost of building an extension in your your area is to Post an Enquiry for home extension costs. You will get up to four house extension prices to compare and you are under no obligation whatsoever to accept any of them. Finding out the cost of building an extension is a good starting point as you will also get loads of advice on different extension designs and extension ideas. A large proportion of the cost of an extension goes into the groundwork’s and foundations and then on the roof. To add the required courses of blocks and bricks for the second storey and then fit them out isn't such a huge increase in the cost. Cost/Price of Building an Extension. Assuming that your name isn’t Olly Garch, Croesus or even Gates, the thought process behind getting several quotations for your new extension is simple.  Target Costs. It would not be unreasonable to target costs for the total build of an Extension, excluding professional fees and local authority charges, at around £1,200 to £1,800 per square metre, i.e. say £110 to £170 per square foot.  Most builders can give you an idea of what your extension will cost per square foot or metre. For example, a basic single storey extension would typically cost around £1,000 per square metre but it could be up to £1,600 or more for a premium two storey extension. So a 3 x 5 metre extension would cost £15,000 and up to £50,000 for a two storey, more premium extension.
http://www.moneywise.co.uk/home-mortgage/improvements/home-extensions-what-you-need-to-know http://www.homeadvisor.com/cost/additions-and-remodels/build-an-addition/ http://www.whatprice.co.uk/costs/extension-costs.php http://www.extensioncosts.co.uk/ http://designfor-me.com/cost-planning/how-much-does-a-house-extension-cost/ http://www.extensions-supermarket.com/ http://www.buildingsheriff.com/extension-calculator-cost.html http://www.homebuildingextensions.com/extension-costs/house-extension-costs/costs-of-building-an-extension.html http://www.buildinginspiration.co.uk/planning/budgeting-extensions/
building an extension cost