4+ bed terraced, semi or detached houses where splitting into 2-3 self-contained flats unlocks 30-60% uplift over single-house value. Tier-ranked daily by floor area, bedroom/bathroom count, age band, and live 1-bed + 2-bed flat comparables in the same postcode area.
In most UK postcodes the per-square-foot value of a 1-bed or 2-bed flat is meaningfully higher than that of the equivalent room within a 4-5 bed family house. A 130 sqm Victorian terrace split into one 1-bed plus one 2-bed flat typically resells for 30-60% more than the same house sold whole, after conversion costs of £35-80k per unit. We surface every 4+ bed UK house with the floor area, bathroom count and layout to support a clean split, rank Gold / Silver / Bronze on the spread between single-house value and the post-conversion flat-comparables, and flag the LPA-level restrictions (Article 4, conservation, listed) that would block consent.
Gold tier: 4+ bed, 120+ sqm, 2+ existing bathrooms, Victorian / Edwardian / pre-1939 build. Silver: 4 bed at 100-120 sqm or older builds without 2 bath. Bronze: 3 bed >130 sqm for a 1+1 split.
Not listed, not in a hard Article 4 zone, and the LPA has historically approved split-flat conversions in the postcode area. Conservation flagged but not auto-excluded.
Partition £350/sqm + kitchen £8k/flat + bathroom £6.5k/flat + separate utilities £4.5k/flat + fire safety £3.5k/flat + separate entrance £12k + planning £3k + architect £5k + building regs £2k + 18% contingency + 8%pa holding finance for 15 months.
Gold tier requires a 4+ bed house at 120+ sqm internal floor area, 2+ existing bathrooms, a Victorian / Edwardian / pre-1939 build (which usually means workable ceiling heights and a layout that splits cleanly), a projected uplift of 40% or more over the single-house value, and a non-listed status in a favourable LPA. Silver tier relaxes the size to 100-120 sqm or accepts older builds without the second bathroom. Bronze tier covers 3-bed houses over 130 sqm where a 1+1 split is feasible but stair access needs deep DD.
Yes — converting a single dwellinghouse (C3) into multiple flats (still C3 but a different number of units) is a material change requiring full planning permission, even though the use class itself does not change. You also need building regulations sign-off for fire compartmentation, sound insulation, ventilation and means of escape, and Part L energy compliance per flat.
On Gold-tier candidates we typically model 30-60% gross uplift over single-house value, settling at 15-35% net after conversion costs (£35-80k per flat), planning + architect + building regs (£10k), VAT on works, and 15 months of 8%pa bridging finance. The gross figure is the resale of the two/three flats combined vs the alternative of selling as one house. Net is what lands in your pocket after the full cost stack.
We cross-reference every listing against the planning.data.gov.uk live datasets — Article 4 directions, conservation area boundaries, listed-building registers, and (where available) the LPA's recent decision history on split-flat conversions for that postcode area. Listings inside a hard Article 4 zone for residential conversion are tier-downgraded; listed buildings are excluded.
See every UK 4+ bed house with the size, layout and planning context to support a clean split. Ranked daily.
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