Before you speak to an architect or builder, it helps to know roughly what a project costs. The extension cost calculator and loft conversion cost calculator give a cost range by floor area, UK region and finish level, with professional fees, a contingency and VAT shown separately, so you can see where the money goes.
Waste and skips
Almost every job creates waste, and skip hire is easy to under-budget. The skip size calculator suggests a size from your waste volume or type of job, and warns about weight limits for soil and rubble. For dig-outs, start with the excavation calculator, which allows for soil bulking up once it is dug.
Anything else
If we don't have a calculator for your product, the build-your-own calculator lets you measure any shape and enter the coverage or pack size from the label. You can save it and use it again.
How accurate are the extension and loft conversion cost estimates?
They give a realistic range for budgeting, based on floor area, region and finish. Real quotes vary with access, ground conditions, design and the builder, so always get at least three quotes.
What size skip do I need?
A 6–8 yard builder's skip suits most kitchen, bathroom and garden clear-outs. Heavy waste like soil and rubble usually has to go in a smaller skip because of weight limits. The skip size calculator suggests a size for your job.