Planning permission in Manchester

Once you need planning permission, yes — and by a figure most people find surprising. Manchester's Policy DC1.3, from its 1995 Unitary Development Plan and still listed by the council as extant, says the council "will not normally approve rearward extensions greater than 3.65m (12 ft) in length". Two important caveats. First, this only applies when you need planning permission in the first place — if your extension is permitted development, the policy never comes into play. Second, "will not normally approve" is a starting presumption, not an absolute ban; the policy expressly allows cases to be judged on their merits, and DC1.5 provides exemptions such as adaptations for a disabled occupant.

Because Manchester has not yet replaced it. The council's Core Strategy superseded much of the 1995 UDP, but not all of it — the council maintains a published list of "extant" UDP policies that remain in force, and the Citywide Development Control Policies document is on it. A new Manchester Local Plan is working through examination, with adoption expected around summer 2027. Until then, the 1995 development control policies still guide decisions on house extensions.

No. This is worth being clear about, because Manchester does have Article 4 Directions and they are widely discussed — but every one of them concerns a change of use, not building work. There is a citywide Article 4 removing the right to convert a house (Class C3) into a small house in multiple occupation (Class C4), and further Directions restricting conversion of offices and light industrial premises to residential. None of them removes your right to extend, alter a roof, build a porch or lay a driveway. In that respect Manchester is markedly less restrictive than neighbouring Stockport, where 24 conservation areas have had those rights removed.

Manchester has 34 conservation areas. Didsbury has three — Didsbury St James (1970), Blackburn Park (1979) and Albert Park in West Didsbury (1988). Chorlton has three — Chorlton Green (1970, one of the first two ever designated in the City of Manchester), Chorltonville (1991) and Wilbraham Road/Edge Lane (2005). Withington has three — Withington (1983), Old Broadway (1991) and Ballbrook (1991). Whalley Range (1991) and Victoria Park (1972) are each designated too.

This is the combination that catches people out, and it is the single most useful thing to understand about extending in south Manchester. Under the national rules, a single-storey rear extension can often be built without planning permission at all — comfortably more than 3.65m. But in a conservation area those permitted development rights are curtailed, which pushes you into making a planning application. And once you are making an application, Policy DC1.3's 3.65m starting point applies. So the very suburbs with the most conservation areas — Didsbury, Chorlton, Withington, Whalley Range, Victoria Park — are precisely where the 1995 rule actually bites.

Yes, from the same policy. DC1.3 also says the council will not normally approve two-storey extensions with a flat roof (particularly where visible from the public highway), two-storey extensions to terraced properties occupying the full width of the house, or flat-roofed extensions to bungalows. DC1.4 adds that the council will normally permit two-storey side extensions which leave a minimum of 1.52m (5 ft) between the side wall and the common boundary. And DC18.1 goes further than most people expect: development proposals adjacent to a conservation area — not just inside one — are assessed against the same harm test, expressly including "the protection of views into and out of Conservation Areas".

Yes. Policy DC1.6 is explicit about it: "For the avoidance of doubt, policies DC1.1 to DC1.4 apply to domestic houses, flats, houses in multiple occupation, nursing homes, rest homes and hotels." So if you are extending a converted flat, an HMO, a care home or a hotel in Manchester, the same 3.65m starting point applies to a rear extension, and the same 1.52m boundary guidance applies to a two-storey side extension. That catches a lot of landlord and operator projects where people assume the domestic rules do not apply to them.

Manchester City Council is the local planning authority for Manchester, including Didsbury, Chorlton, Withington, Whalley Range and Victoria Park. Note that neighbouring suburbs can fall under different authorities with quite different rules — Heaton Moor and Heaton Mersey are Stockport, for instance. We prepare and submit householder planning applications and Lawful Development Certificates in-house.