The professional alternative to a home extension cost calculator – accurate, regionally priced extension estimates with detailed breakdowns, delivered by a team you’ll want to work with again.
When you need to estimate cost of extension work, an online home extension cost calculator can only get you so far. Generic price-per-square-metre figures don’t account for your specific roof design, ground conditions, structural requirements, regional labour rates or the level of finish you’re planning. The result is a ballpark figure that can be thousands of pounds away from what your project will actually cost.
ProQuant Estimating is the house extension cost estimator built for accuracy. We produce a full breakdown of your extension estimate cost – covering materials, plant and labour, each individually timed and priced using live regional rates. Whether you’re planning a single-storey rear extension, a double-storey build, a side return or a wrap-around, we give you the numbers you need to manage the tender process and appoint your contractor with confidence. Our extension estimate calculator service starts at just £100 plus VAT and delivers within 5 days or if it’s urgent we can get it to you within 1 day.
“The key for me is the attention to detail, they get everything without ever missing bits which wasn’t the case with others I’d used in the past.”
“Compared to what I saw before I started working with them It’s an incredible format. I’d say honestly that I won a lot of my work just from the presentations they supply and the way they set it out for me. ”
“The service from the guys is perfect too, any questions or queries they’re always available to answer and help, really efficiently”
ProQuant Estimating’s team has over 30 years’ experience working in the construction trade. That means when it comes to estimating extension costs, we understand exactly what drives the price – from foundations and steelwork through to roofing, glazing, plastering and regional labour rates.
Whether you’re a homeowner planning your first extension or an architect or builder managing multiple projects, we apply the same precision and personal care to every estimate we produce. Our extension estimate cost reports are used directly in the tender process by clients across the UK.
Everything in one place ready to present to clients within 4-5 days
or use our next day express delivery if urgent
Within 24 hours of submitting your drawings, you’ll receive a quote for the cost of your extension estimate.
Then, within 5 days, you’ll receive a complete breakdown of materials, plant and labour – each individually timed and priced using our live average rates, specific to your region. If you need it faster, our same-day express service is available.
Simply send us your drawings and receive back a fully costed and timed home extension scheme.
The most reliable way to estimate cost of extension work is to have a professional quantity surveyor or estimating service produce a detailed breakdown based on your actual drawings.
Generic online home extension cost calculators can give a rough ballpark figure, but they cannot account for your specific design, ground conditions, structural requirements or regional labour rates. ProQuant Estimating produces a full, itemised extension estimate cost report – covering materials, plant and labour – within 5 days of receiving your drawings.
House extension costs in the UK vary significantly depending on the type of extension, size, specification and location. As a general guide, single-storey extensions typically cost between £1,800 and £3,000 per square metre, with most projects ranging from £30,000 to over £100,000 fully finished.
Double-storey extensions usually range from £50,000 to £195,000. London and the South East typically run 25-40% above the national average. A professional extension estimate from ProQuant will give you an accurate, regionally priced breakdown specific to your project.
Significantly more accurate. An online home extension cost calculator uses fixed price-per-square-metre averages that cannot account for your specific design, materials, site conditions or location. A ProQuant extension estimate is based on your actual drawings and priced using live regional rates – split by materials, plant and labour. It’s the difference between a rough guide and a figure you can actually use when appointing a contractor.
We produce extension estimate cost reports for all residential extension types, including single-storey rear extensions, double-storey extensions, side return extensions, wrap-around extensions, over-garage extensions and basement extensions. We also cover associated build types including loft conversions, garage conversions and garden room extensions. Whatever the project, we apply the same detailed, regionally priced approach.
Our extension estimates provide a complete breakdown covering materials, plant and labour – each individually timed and priced using live regional rates. This gives you full visibility of where the budget is allocated, making it straightforward to manage the tender process, sense-check contractor quotes and plan your project finances accurately. Reports are typically delivered within 5 days, with a same-day express option available.
Extension estimates start at £90 plus VAT. Given that most UK home extensions cost upwards of £30,000, a professional estimate is one of the most cost-effective steps you can take before any contractor is appointed.
