Cobin Contractors offer rear extension builders across leeds. We provide single-storey and double-storey builds, open-plan kitchen-diners and rear wall structural alterations, all structural steelwork handled in-house. We serve Leeds, Harrogate, Baildon, Ilkley, Roundhay, Adel and the wider Yorkshire region.
Standard PD. Up to 8m with Prior Approval (Larger Home Extension scheme). Max height 4m.
Standard PD. Up to 6m with Prior Approval. Party Wall Act may apply. Max eaves 3m within 2m of boundary.
Must be 7m from rear boundary. Roof pitch must match. On designated land: full planning required
Common in Harrogate Stray area and Ilkley. PD rights may be restricted by Article 4 Direction. Full planning often needed.
Planning permission is separate from Building Regulations. Every rear extension needs Building Control approval regardless of PD status.
Unlike loft conversions or side extensions, a rear extension creates ground-floor space that connects directly to your garden. Combined with load bearing wall removal and large glazed openings, a rear extension transforms the entire rear of the ground floor into open-plan living.
A well-executed rear extension adds substantial value to Leeds properties. Open-plan kitchen-diners are among the most consistently sought-after features by buyers across the Leeds and Harrogate housing markets. Check our kitchen extensions Leeds.
Most rear extensions require RSJ steel beam installation where the rear wall is opened up. Cobin Contractors handles the full build and all structural steelwork — one team, one contract, one completion certificate.
Semi-detached houses make up a large proportion of the housing stock. Standard PD depth is 3m, increasing to 6m with Prior Approval. Party Wall Act obligations apply if excavating within 3m of the shared boundary or the shared wall.
Planning rules for rear extensions in Leeds are set by national legislation — the Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended) — not by Leeds City Council individually. The same depth and height limits apply across Leeds, with exceptions for designated land.
Three main double storey formats suit different property types and gardens. The right choice depends on your plot shape, orientation, planning constraints and the rooms you need to add.
A double storey extension is not a two-week job. We break every project into eight clear phases — each with a defined output, defined sign-off and a named person responsible on our team.
We build two-storey extensions across Leeds, Harrogate, Bradford and the wider Yorkshire region. Every build is managed from our West Yorkshire base — no remote site managers, no weeks between visits.
Full county coverage
Wider regional coverage
A typical double storey rear extension (25–40m²) in West Yorkshire costs £80,000 to £130,000 turnkey in 2026 — including design, structural engineering, planning submission, foundations, steelwork, shell and standard finishes. A wrap-around (40–60m²) runs £110,000 to £180,000. Yorkshire rates typically run £15,000–£25,000 below equivalent London projects. Every Cobin quote is fixed-price before work starts.
A typical double storey rear extension (25–40m²) in West Yorkshire costs £80,000 to £130,000 turnkey in 2026 — including design, structural engineering, planning submission, foundations, steelwork, shell and standard finishes. A wrap-around (40–60m²) runs £110,000 to £180,000. Yorkshire rates typically run £15,000–£25,000 below equivalent London projects. Every Cobin quote is fixed-price before work starts.
A typical double storey rear extension (25–40m²) in West Yorkshire costs £80,000 to £130,000 turnkey in 2026 — including design, structural engineering, planning submission, foundations, steelwork, shell and standard finishes. A wrap-around (40–60m²) runs £110,000 to £180,000. Yorkshire rates typically run £15,000–£25,000 below equivalent London projects. Every Cobin quote is fixed-price before work starts.
A typical double storey rear extension (25–40m²) in West Yorkshire costs £80,000 to £130,000 turnkey in 2026 — including design, structural engineering, planning submission, foundations, steelwork, shell and standard finishes. A wrap-around (40–60m²) runs £110,000 to £180,000. Yorkshire rates typically run £15,000–£25,000 below equivalent London projects. Every Cobin quote is fixed-price before work starts.
A typical double storey rear extension (25–40m²) in West Yorkshire costs £80,000 to £130,000 turnkey in 2026 — including design, structural engineering, planning submission, foundations, steelwork, shell and standard finishes. A wrap-around (40–60m²) runs £110,000 to £180,000. Yorkshire rates typically run £15,000–£25,000 below equivalent London projects. Every Cobin quote is fixed-price before work starts.
A typical double storey rear extension (25–40m²) in West Yorkshire costs £80,000 to £130,000 turnkey in 2026 — including design, structural engineering, planning submission, foundations, steelwork, shell and standard finishes. A wrap-around (40–60m²) runs £110,000 to £180,000. Yorkshire rates typically run £15,000–£25,000 below equivalent London projects. Every Cobin quote is fixed-price before work starts.
A typical double storey rear extension (25–40m²) in West Yorkshire costs £80,000 to £130,000 turnkey in 2026 — including design, structural engineering, planning submission, foundations, steelwork, shell and standard finishes. A wrap-around (40–60m²) runs £110,000 to £180,000. Yorkshire rates typically run £15,000–£25,000 below equivalent London projects. Every Cobin quote is fixed-price before work starts.
