House Extension, Loft & Renovation Cost Calculator
Planning a house extension, loft conversion or home renovation? Use our free project cost calculator to get an instant indicative budget based on the size, type and specification of your project.
Tell Us About Your Project
Your estimate updates from the information below.
Optional Extras
Select any additional works you may want included in your budget.
Indicative guide price excluding VAT
Single Storey Extension
Your final quotation will depend on drawings, specification, structural requirements, site access and the existing condition of your property.
What Does the Project Cost Include?
Every building project is different. Our calculator is designed to give homeowners an initial realistic budget before drawings and a detailed specification are available.
House Extensions
Costs can vary depending on foundations, steelwork, drainage alterations, roof construction, glazing, structural openings and internal finishes.
Loft Conversions
Loft costs depend on roof structure, dormer size, steelwork, staircase design, roof coverings, windows, insulation and whether an ensuite is required.
Home Renovations
Renovation costs depend heavily on the existing property, structural alterations, electrical and plumbing work, kitchens, bathrooms and the required finish.
Get a More Accurate Quotation
Have drawings, plans or project details already? Send them to KP Build Contractors and we can discuss your requirements and provide a more detailed quotation.