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Knowing the Extension Cost Before You Call an Architect or Builder

ExtendIQ gives homeowners and local builders a realistic starting point — before the first conversation happens.

One of the most common frustrations in residential construction is the gap between expectation and reality. A homeowner spends months planning a rear extension, imagining how the space will transform their home, then receives a quote that bears no resemblance to what they had in mind. On the other side, a builder invests time visiting a site and preparing a detailed tender, only to find the client was never in the right budget range to begin with. That disconnect is avoidable.

ExtendIQ is an online extension cost calculator developed by a professional Quantity Surveyor and available through quintinqs.com. Users enter a few straightforward inputs — extension size, quality level, region, roof type, demolition requirements, and key features — and receive an instant cost estimate calibrated against BCIS industry benchmarks. No jargon, no obligation, no waiting for a callback.

For homeowners, this means arriving at that first conversation with a builder already grounded in realistic numbers. For builders, it means clients who have done their homework. Fewer wasted site visits, fewer awkward conversations about budget, and more time spent on projects that are genuinely viable.

For those who need something more formal, a downloadable cost report in BCIS Elemental Format is available for £45. This is the same structured format used by professional cost consultants across the UK, breaking the estimate down by element so you can understand where the money goes.

To assist local folk and builders, each can access the same report at a reduced rate of £15 — get in touch directly at mail@kevinbarryqs.com to receive your access code. It is a practical way to offer clients a credible cost picture before committing to a full tender.

ExtendIQ was built in Northern Ireland and serves clients and builders across the UK. If you are planning an extension and want a clear, honest estimate before any work begins, visit www.quintinqs.com to use the calculator today. Reduce avoidable expense or tailor the design to your budget.

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