Where extending pays on the Isle of Man
One comparison decides whether a build is worth doing: what a square metre sells for locally against what a square metre costs to build. Isle of Man new build runs £4,000–£6,000/m² by quality and refurbishment £2,000–£4,000/m². Island-wide, properties currently for sale that publish a floor area sit at a midpoint of £2,538/m² across 27 listings.
By parish: sale value per m² against build cost
| Parish | Sells for | Margin vs new build | vs mid refurb | Verdict |
|---|---|---|---|---|
| Ramsey (5) | £2,513/m² | −£487 to −£1,987 | +£463 | New build does not pay here |
| Douglas (5) | £2,412/m² | −£588 to −£2,088 | +£362 | New build does not pay here |
Margin is local value per m² minus build cost per m². The new-build column runs best case (£4,000/m²) to worst (£6,000/m²). Parishes with fewer than 5 floor-area listings are left out rather than shown on a sample that can't carry a conclusion.
Under-improved stock: asking well below its parish rate
Properties currently for sale asking at least 20% less per m² than the midpoint for their parish. That gap is where refurbishment or extension has the most room — though it can equally mean a small flat, a short lease, an awkward site or something structural. This is a shortlist to go and look at, not a valuation of any of them.
| Property | Asking per m² | Parish midpoint | Gap |
|---|---|---|---|
| Hyde Mannin Place, Bay View, Ramsey, Isle of M Ramsey · 399.5 m² · £299,950 |
£751/m² | £2,513/m² | -70% |
| M&G House, Douglas, IM1 5BF Douglas · 360.6 m² · £395,000 |
£1,095/m² | £2,412/m² | -55% |
| The Willows, Altdale Terrace, Lezayre Road, Ra Ramsey · 229.1 m² · £295,000 |
£1,288/m² | £2,513/m² | -49% |
Sale values here come from asking prices, because the Isle of Man's sold register holds no floor areas at all — so the margins reflect what sellers want, not what buyers paid. Build rates are typical Isle of Man figures, not a quote, and exclude land, fees, finance and the professional team. Nothing here accounts for whether a site can physically take an extension, whether a street has a ceiling price, or the condition behind the asking price. Check what actually gets granted and how often work of this kind succeeds before committing.