Construction Cost Calculator – Get an Instant Price Estimate

Planning a construction project in London? Whether you’re considering a loft conversion, a rear or basement extension, or a new build, our Construction Cost Calculator provides a quick and reliable estimate. Simply select the type of project, and get an idea of potential costs based on your specifications.

Loft Conversion Costs in London

A loft conversion is one of the most effective ways to add space and increase the value of your home. The final price of a loft conversion depends on several factors, including the size, design, and structural adjustments required. Our calculator helps you estimate the cost of:

• Velux Loft Conversions – A simple solution requiring minimal structural work.
• Dormer Loft Conversions – Adds more headroom and usable space.
• Mansard Loft Conversions – Maximises space with significant roof alterations.
• Hip-to-Gable Loft Conversions – Ideal for semi-detached and detached homes.

Home Extension Costs in London

A home extension allows you to create more living space without moving. Whether you’re planning a side return extension, a rear extension, or a double-storey extension, our calculator provides an estimate tailored to your project.

Common Types of Extensions:

• Side Return Extension – Expands narrow spaces at the side of your home.
• Rear Extension – Extends your property into the garden area.
• Double Storey Extension – Increases both ground and upper floor space.
• Basement Extension – Creates additional living or storage space underground.

Refurbishment & New Build Estimations

Our Construction Cost Calculator also provides estimates for:

• Refurbishments – Whether you’re renovating a single room or an entire property.
• New Builds – From small residential projects to large-scale developments.

Commercial & Residential Project Costs

Our calculator supports both residential and commercial projects, including:

• Hospitality – Hotels, restaurants, and leisure spaces.
• Sport & Education – Gyms, schools, and training facilities.
• Culture & Public Spaces – Museums, galleries, and theatres.
• Warehouses & Industrial Buildings – Functional and large-scale developments.

Estimate Your Construction Costs in London

Use our Construction Cost Calculator to get a personalised estimate for your loft conversion, home extension, refurbishment, or commercial project in London. Plan your budget with confidence and start your project today!