Is it cheaper to extend your house or move?
Most homeowners get this wrong.
They compare the cost of an extension against house prices on Rightmove — but forget stamp duty, estate agent fees, and solicitor costs on both sides.
And they underestimate the true cost of extending because designers estimates routinely miss the costs that drive the final number.
One decision. Two complete numbers.
BuildLens fixes both.
Side-by-side cost comparison
The true cost of extending your home versus selling and buying .
Every cost included. Stamp duty, agent fees, legal costs, moving costs, and real construction costs calculated from completed project data.
Real extension costs in detail
Not from an online extension cost calculator. Not from industry averages.
From completed residential projects. What real homeowners actually paid to extend, in your area with up to date market materials and labour costs updated weekly.
Transaction costs most people forget
Stamp duty on an upsizing purchase, estate agent commission on your sale, solicitor fees on both sidesand the premium you pay to buy in a market where you are also selling.
And that's before the costs you may incur on repairs required to any new property you buy.
One report. One answer. £49
Which option costs less, which builds more equity, and which carries less risk.
For your property, at today's prices. Delivered in 24 hours.
Independent cost data & market analysis,
not interested opinion.