Extension & Loft Conversion Costs in Manchester (2026)

Manchester extension and loft conversion prices for 2026

The table below shows modelled all-in costs for the projects Manchester homeowners ask about most. We take our national build rates per m², apply the North of England regional factor of 0.92, then add design fees, a structural engineer, building control, a planning or certificate fee and 20% VAT. They are estimates to budget against, not quotes.

Project	Size	Basic	Standard	High-end
Single storey rear extension	20m²	£43,000 – £56,500	£52,000 – £68,500	£63,500 – £87,500
Kitchen extension with mid-range kitchen	25m²	£71,500 – £105,500	£82,500 – £120,500	£97,000 – £144,000
Two storey extension (with planning)	40m²	£75,500 – £97,000	£91,500 – £118,500	£112,000 – £151,500
Side return extension	15m²	£36,000 – £49,000	£44,500 – £59,500	£55,000 – £75,500
Rear dormer loft conversion	30m²	£39,000 – £58,500	£43,500 – £66,500	£54,000 – £79,000
Hip to gable loft conversion	30m²	£48,000 – £68,000	£52,500 – £75,500	£64,500 – £91,000
Garage conversion (single)	15m²	£9,500 – £14,000	£12,500 – £18,500	£17,000 – £24,000

How our figures compare with published Manchester prices

MyJobQuote’s Manchester guide (updated August 2026) gives an average loft conversion of around £36,000, with a 30m² dormer at £31,500–£45,000 and a 30m² hip to gable at £40,500–£54,000. PlanWatch (October 2026) puts a standard rear dormer on a three-bed semi in Manchester at £45,000–£65,000. The gap is mostly about what is counted: MyJobQuote’s ranges are largely the builder’s price, while PlanWatch and our calculator include professional fees and VAT. A sensible Manchester dormer budget therefore lands in the mid-£40,000s to mid-£60,000s once everything is paid for.

Cost per m² in Manchester

Project	MyJobQuote Manchester (per m²)	Our North build rate, standard (ex VAT)
Velux / rooflight loft	£650 – £1,000	£644 – £883
Dormer loft	£1,050 – £1,550	£1,122 – £1,601
Hip to gable loft	£1,250 – £1,800	£1,362 – £1,840
Single storey extension	–	£2,024 – £2,484
Garage conversion	–	£607 – £846

The two sets of loft rates are close, which gives some confidence in the range. Per m² figures are for building work only; add 15–30% for fees, VAT and certificates.

Manchester’s housing stock and what suits it

The 2021 Census recorded about 214,700 households in the City of Manchester. Roughly 32% lived in semi-detached houses, 28% in terraced houses, 28% in purpose-built flats and only around 5% in detached homes. That mix shapes which projects make sense.

Victorian and Edwardian terraces: Levenshulme, Chorlton, Fallowfield, Withington

Two-up two-down and larger bay-fronted terraces are the backbone of inner and south Manchester. Most have a rear outrigger (the narrower back wing housing the kitchen), which makes two projects popular:

• Rear dormer or L-shaped dormer loft conversions, often running over the main roof and the outrigger to fit a double bedroom and shower room. MyJobQuote notes that terraces in Chorlton, Levenshulme, Fallowfield and Withington commonly suit rooflight or rear dormer conversions.
• Side return or wrap-around kitchen extensions, infilling the narrow yard beside the outrigger. See our side return extension cost guide.

A real local case shows how this works in practice. In 2023 Manchester planning officers recommended approval of an L-shaped rear dormer over the main roof and outrigger of a house on Whalley Avenue, Chorlton, clad in zinc with black aluminium windows. The report noted that a dormer of the same size could have been built under permitted development; planning permission was only needed because the zinc did not match the existing roof.

1930s semis in the suburbs

Semi-detached houses are the single largest group in the city, and 1930s and later semis are typical of suburbs such as Didsbury and, over the boundary in Trafford, Sale, Stretford and Urmston. MyJobQuote notes these homes usually have more roof space than inner-city terraces. Their hipped roofs are the classic candidate for a hip to gable loft conversion with a rear dormer, and many have space at the side or rear for a single or two storey extension.

Newer estates and garage conversions

Garage conversions are most common on post-war and modern estates with integral or attached garages. They are the cheapest way to add a room, but check your planning history first: estates are often approved with conditions that remove permitted development rights or require parking spaces to be kept, in which case you will need planning permission. Our garage conversion cost guide explains the work in detail. BestBuilders’ Manchester page (August 2026) gives indicative prices of £7,360–£16,560 for a standard single garage conversion and £13,800–£27,600 for a double; our modelled range for a 15m² single garage including fees and VAT is £12,500–£18,500.

Planning in Manchester and Greater Manchester

A point that often confuses people: “Manchester” on an address does not mean Manchester City Council. Greater Manchester is made up of 10 separate councils – Bolton, Bury, Manchester, Oldham, Rochdale, Salford, Stockport, Tameside, Trafford and Wigan – and each decides its own householder applications using its own design guidance. Check which council covers your postcode before reading any guidance.

Manchester City Council

Manchester assesses extensions against its Core Strategy (policy DM1 on design and amenity) and saved policy DC1 from its older Unitary Development Plan, alongside the Guide to Development in Manchester SPD. DC1, as quoted in recent committee reports, includes some useful rules of thumb:

• Rear extensions projecting more than 3.65m will not normally be approved.
• Flat-roofed two storey extensions will not normally be approved.
• For two storey side extensions, a guide gap of 1.52m between the side wall and the common boundary is sought.
• Extensions should not be excessively large or bulky, cut neighbours’ sunlight, daylight or privacy, or be out of character with the area.

The city currently has 35 conservation areas, including Wilbraham Road/Edge Lane in Chorlton. In October 2026 the council proposed seven more, among them Didsbury Village, Fallowfield and Burnage Garden Village, which would take the total to 42. Within a conservation area, roof extensions and many small extensions lose permitted development rights, so watch for the outcome if you live in one of the proposed areas. Manchester also has a city-wide Article 4 direction, in force since October 2011, which means turning a family house into a small shared house (HMO) needs planning permission – relevant if you are converting a loft to add letting rooms.

Other Greater Manchester councils

• Trafford (Sale, Stretford, Urmston, Altrincham) uses SPD4: A Guide for Designing House Extensions and Alterations. It treats a 3m deep single storey rear extension as acceptable on semis and terraces, asks for a 1m gap to the side boundary for first-floor and two storey side extensions, and 750mm for single storey side extensions.
• Stockport (Heaton Moor, Cheadle, Bramhall) uses its Extensions and Alterations to Dwellings SPD, adopted in February 2011.
• Salford uses its House Extensions SPD (2006). A January 2024 explanatory note confirms most of it still applies, though parts of policies HE3 and HE4 and the section on permitted development have been superseded.

Permitted development, certificates and fees

Across England, many rear dormers, hip to gable conversions and single storey rear extensions are permitted development: up to 3m deep for an attached house (6m with prior approval), and up to 40m³ of extra roof space for a terrace or 50m³ for a semi. Flats have no permitted development rights. From 1 April 2026 a householder planning application in England costs £548 and a lawful development certificate £274. Building regulations approval is needed for every loft conversion, extension and garage conversion. Read our guide to loft conversion planning permission for the full limits.

Practical costs: permits, access and party walls

• Scaffolding on the pavement: Manchester City Council charges a £175 administration fee for a scaffolding permit plus a monthly inspection fee from £90 (up to 25m² of scaffold) to £309 (over 125m²). Allow up to 20 working days for the council to respond, and work cannot start until the permit is issued.
• Skips on the road: a skip permit costs £42 for up to 7 days and is applied for by the skip company, not you. Skips in restricted locations need prior approval with 10 days’ notice.
• Terraced access: many Manchester terraces open straight onto the pavement with only a narrow back entry, so materials and waste often go through the house or over the roof. MyJobQuote notes this can add labour time and delays.
• Party walls: the Party Wall etc. Act 1996 applies. A mid-terrace loft conversion usually means serving notice on both neighbours; budget £1,000–£3,000 per neighbour if they appoint surveyors. See our party wall agreement guide.

How long do projects take in Manchester?

MyJobQuote gives 6–8 weeks on site for a Manchester dormer or hip to gable conversion, 4–6 weeks for a rooflight conversion and 8–10 weeks for a mansard. Before that, allow a few weeks for a survey and drawings, then up to 8 weeks for a council decision on a certificate or planning application (the statutory target for householder cases), with party wall notices running alongside. Garage conversion timescales vary widely with scope: BestBuilders’ Manchester page quotes anything from 2–4 weeks to 6–10 weeks on site. See our rear extension cost guide for typical extension build times.

Does extending add value in Manchester?

HM Land Registry’s UK House Price Index put the average Manchester home at £257,000 in August 2026 (provisional), up 2.1% on a year earlier. Terraced houses averaged £260,000, semi-detached houses £334,000 and detached houses £485,000.

Those gaps matter. A standard rear dormer at £43,500–£66,500 turns a two-bedroom terrace into a three-bedroom home, the kind of step that moves a property into a different price bracket. On a semi, a hip to gable conversion adds a bedroom at well under the cost of moving up to a detached house. Which?, citing Nationwide research, reports that a conversion adding a bedroom and bathroom can raise value by up to 24%. Still, check sold prices on your own street: there is a ceiling to what buyers will pay in any road, and a high-end specification may not be fully recovered.

Ways to keep costs down

• Design within permitted development and apply for a £274 certificate rather than a £548 planning application, which also avoids the risk of a refusal and redesign.
• Match materials (slate or tiles to suit the existing roof) so a dormer does not need planning permission purely because of cladding, as in the Chorlton example.
• Combine a loft and a rear extension in one build to share scaffolding, design and building control costs.
• Get three itemised quotes that spell out scaffolding, permits, steelwork, stairs and party wall work. Compare with our loft conversion cost calculator.
• Look at our guide to financing an extension before committing to a specification.

Manchester extension and loft conversion FAQs

How much does a loft conversion cost in Manchester?

Most Manchester loft conversions cost £43,500–£66,500 for a 30m² rear dormer and £52,500–£75,500 for a hip to gable, including fees and VAT. MyJobQuote gives an average of around £36,000 for the building work alone. See our main loft conversion cost guide.

How much is a house extension in Manchester?

A 20m² single storey extension costs about £52,000–£68,500 at a standard finish and a 40m² two storey extension about £91,500–£118,500, including fees and VAT but not a new kitchen. Our house extension cost guide covers every type.

How much does a garage conversion cost in Manchester?

Around £12,500–£18,500 for a standard 15m² single garage including fees and VAT. BestBuilders quotes £7,360–£16,560 for a standard single conversion in Manchester.

Do I need planning permission for a loft conversion in Manchester?

Often not. Rear dormers and hip to gables on houses are usually permitted development, provided materials match and volume limits are met. You will need permission in a conservation area, for a flat, for front dormers, or where permitted development rights have been removed.

Which council handles my planning application?

It depends on your postcode. Greater Manchester has 10 councils, including Manchester, Salford, Trafford and Stockport, and each has its own design guidance and planning team.

Is Manchester cheaper than the rest of the UK for building work?

Generally yes. Our calculator uses a factor of 0.92 for the North of England against 1.00 for a mid-cost region, and MyJobQuote describes Manchester costs as below the national average and broadly similar to Leeds.

Costs in other areas: London extensions · London lofts · Beckton · Leatherhead · Portsmouth · Maidstone · Essex · Peterborough · Bristol · Birmingham · Nottingham · Leeds · Liverpool · Llanelli · Glasgow · All areas compared

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