Extend vs Move Calculator: Is It Cheaper to Improve or Move?

The calculator compares two totals. On the extend side, it multiplies the space you need by current Oxfordshire build costs — £2,800–£3,500 per square metre for a single-storey extension — or applies typical fixed ranges for lofts and basements. loft conversions in Oxford run from £45,000 for a straightforward Velux conversion to £75,000 for a full mansard, so the calculator adjusts by conversion type. On the move side, it adds up the real costs of buying and selling: stamp duty on your new purchase, estate agent fees of roughly 1–1.5% plus VAT on your sale, conveyancing for both transactions, a survey, and removals.

Extend vs Move Comparison Graphics

Our split-graphic compares total transaction overheads against home renovation costs, showing where your hard-earned budget goes: into third-party taxes or home equity.

These build figures aren't scraped from a national average. They come from our own completed projects across Oxford and Oxfordshire — Victorian terraces in East Oxford, Edwardian semis in Summertown, 1930s detached homes in North Oxford — priced the way we actually quote: itemised and fixed, never a vague estimate.

Moving a typical family home costs £25,000–£35,000 or more once everything is counted. On a £500,000 purchase, stamp duty alone comes to around £15,000 under current rates. Add agent fees on your sale (£5,000–£8,000 on a similar-value home), conveyancing of £1,500–£2,500 across both transactions, a survey, removals and mortgage arrangement fees, and the total climbs quickly. The uncomfortable part is that none of it buys you anything — it's the cost of the transaction, not the home.

A 20 m² single-storey rear extension in Oxford costs £56,000–£70,000 at 2026 prices and takes 10–14 weeks on site. That's more than the fees on a typical move — but every pound goes into space and value you keep. A well-designed extension or loft conversion usually adds meaningful value to the property as well, whereas moving costs are gone the day you complete.

Many of our clients run this exact comparison before calling us. One family in East Oxford loved their street but had simply run out of room in their Victorian end-of-terrace on James Street. Rather than move, we added a basement conversion, loft conversion and rear extension — transforming a cramped terrace into a home with room to grow, without leaving the neighbourhood or the school catchment they'd chosen it for.

James Street Victorian Renovation

Our comprehensive renovation and extension project in East Oxford, replacing the need to relocate with a multi-level basement, loft, and side-return expansion scheme.

Honestly, sometimes it is. If your plot can't take the extension you need, if you're in a conservation area such as North Oxford or Jericho where an Article 4 Direction removes Permitted Development rights and the planning route looks unlikely, or if the space you need would over-develop the house for its street, moving can be the sounder decision. It's also worth noting that extensions bring their own process: Building Regulations approval, structural calculations, and — for anything on a shared boundary — notices under the Party Wall etc. Act 1996. We handle all of that in-house, including planning applications to Oxford City Council and the district councils, but it's part of the picture the calculator can't capture on its own.

Open-Plan Kitchen Diner Extension

A beautiful house extensions in Oxford creating a seamless transitions from dining areas to outdoor spaces via panoramic glass doors.

The extend vs move calculator gives you a fast, honest starting point — but every house is different, and the only number worth planning around is a fixed one. Crawford Construction is FMB-listed and TrustMark approved, every project carries a 10-year workmanship guarantee, and every quote is itemised and fixed-price with staged payments tied to completed milestones. Book a free site consultation and we'll walk your home with you, talk through what's genuinely achievable, and give you an exact itemised quote to weigh against the cost of moving. Call +44 1865 554333 or email office@crawfordconstruction.co.uk.