House Extensions in Bury

House Extension · Bury

Last updated 06/26 · 8 minute read · Renovat Construction
Reviewed by RICS and PMP certified project management

A house extension in Bury costs between £28,000 and £90,000 in 2026, depending on the size and type. A single storey rear extension runs from £28,000 to £55,000; a double storey addition from £55,000 to £90,000. Most homes in Bury qualify for permitted development for a single storey rear extension, so no planning application is needed provided you stay within the national size limits. If your property falls within one of Bury’s 12 conservation areas, or is listed, planning permission will be required regardless of size.

House extension costs in Bury in 2026

Extension prices in Bury track the broader North West market, which sits well below London and the South East. Labour rates are competitive, materials arrive at national prices, and the borough’s mix of Victorian terraces, interwar semis, and more spacious detached homes in Whitefield and Prestwich gives a wide range of project types to draw on. The table below covers the most common extension types across the borough.

Extension type	Low estimate	Mid estimate	High estimate
Single storey rear, small (15 to 20m²)	£22,000	£30,000	£38,000
Single storey rear, standard (20 to 30m²)	£28,000	£40,000	£55,000
Double storey rear (35 to 50m²)	£55,000	£70,000	£90,000
Side extension, single storey (15 to 25m²)	£22,000	£32,000	£45,000
Wrap-around rear and side (30 to 45m²)	£45,000	£60,000	£80,000

All figures include shell build, structural work, insulation, windows and doors, electrics, and plastering. VAT at 20% applies to most extension work and is not included above. A new kitchen fitted within the extended space adds £8,000 to £25,000 depending on specification. Architect and structural engineer fees typically add 10 to 15% to the build cost.

Source: Renovat Construction project data (North West, 2026); MyJobQuote regional pricing data.

Cost per square metre in Bury in 2026: £1,400 to £1,900

The per-m² rate tends to be higher on smaller extensions because scaffolding, groundworks, and structural costs are spread over a smaller floor area. A larger extension almost always produces a better cost-per-square-metre outcome.

Do you need planning permission for a house extension in Bury?

The majority of single storey rear extensions across Bury do not need a planning application. England’s permitted development rights, set out in Schedule 2, Part 1 of the Town and Country Planning (General Permitted Development) (England) Order 2015 (as amended), give householders the right to extend within defined limits without submitting to the council. This applies across Bury Metropolitan Borough, including Ramsbottom, Whitefield, Prestwich, and Radcliffe, subject to the property not being in a conservation area or listed.

Permitted development limits for single storey rear extensions

House type	Permitted development depth	Larger Home Extension (prior approval)
Detached	Up to 4 metres from the original rear wall	Up to 8 metres with neighbour consultation
Semi-detached or terraced	Up to 3 metres from the original rear wall	Up to 6 metres with neighbour consultation

Other permitted development rules that apply regardless of house type:

• The extension must not exceed 4 metres in height. Where any part comes within 2 metres of a boundary, the eaves height is capped at 3 metres.
• Extensions and all outbuildings combined must not cover more than 50% of the original garden area.
• Nothing may project forward of the principal elevation that faces a highway.
• Side extensions under PD must be single storey, no more than 4 metres high, and no wider than half the original house width.
• A two storey rear extension can be PD if it projects no more than 3 metres and stays at least 7 metres from the rear boundary.
• Materials must be similar in appearance to the existing house.

Source: Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2, Part 1, Classes A and AA. Planning Portal: planningportal.gov.uk.

When you will need planning permission in Bury

• Conservation areas: Bury Metropolitan Borough has 12 designated conservation areas, including Ramsbottom, Summerseat, Bury Town Centre, Holcombe, and both of Prestwich’s conservation areas (Poppythorn and St Mary’s). In these areas, side extensions are not permitted development and other restrictions apply to roof alterations and cladding. The full list is available from Bury Council at bury.gov.uk/planning-building-control/heritage-and-conservation/conservation-areas. Always check your address before committing to a design.
• Article 4 directions: Bury Council has Article 4 directions in two specific areas: Holcombe and St Mary’s Prestwich. These directions remove further permitted development rights in those locations, meaning work that would otherwise be PD requires a full planning application. If your property is in either area, confirm the position with Bury Council’s planning team before instructing an architect.
• Listed buildings: If your home is listed, listed building consent is required for any structural or material alteration, regardless of whether planning permission is separately needed.
• Flats and maisonettes: Permitted development for extensions does not apply to flats or maisonettes. These always require planning permission.
• Exceeding PD limits: Any extension deeper than the PD thresholds, or that breaks other PD rules, requires a full householder application. The current fee is £548 per application, from April 2026 (Planning Portal).

Certificate of Lawful Development

If your extension qualifies as permitted development, you can apply to Bury Council for a Certificate of Lawful Development. This is not legally required, but it gives you written confirmation that no planning permission is needed. It is useful when selling your home, as a buyer’s solicitor may ask for it. The fee is half that of a householder planning application.

The Larger Home Extension scheme in Bury

The Larger Home Extension (LHE) scheme, sometimes called the prior approval route, sits between automatic permitted development and a full planning application. It allows rear single storey extensions deeper than the standard PD limits: up to 6 metres on a semi-detached or terraced house, or up to 8 metres on a detached house.

To use the scheme you must notify Bury Council before starting work. The council then consults adjoining neighbours, who have 21 days to raise any objection relating to amenity. If no sustained objection is received, the council confirms the scheme can proceed. If objections are raised, the council assesses the impact on neighbours and may impose conditions or refuse the scheme.

The LHE scheme is not available on designated land, which includes conservation areas, Areas of Outstanding Natural Beauty, National Parks, and the curtilage of listed buildings. Ramsbottom and Summerseat, for example, have conservation area designations that take them outside the LHE scheme. In those areas you need a full planning application for a deeper extension.

The prior approval process typically takes four to eight weeks once the notification is submitted. Factor this into your project programme, particularly if you are planning to start work in spring or summer.

Building regulations for house extensions in Bury

Building regulations approval is always required for a house extension, regardless of whether planning permission is also needed. The two systems are entirely separate. Building regulations are administered by Bury Building Control or a private approved inspector, and they govern the safety, energy efficiency, and structural performance of the new work.

The main regulations that apply to house extensions:

• Part A (Structure): Foundations must be designed for the ground conditions on your specific plot. Clay soils in parts of the Bury area can require deeper strip foundations or a piled solution.
• Part B (Fire safety): Means of escape must not be compromised. A new habitable room must have a suitable escape window or a compliant protected route to the front door.
• Part C (Moisture resistance): Ground floor construction must incorporate a damp proof membrane, and cavity walls must be properly detailed to prevent rain penetration.
• Part L (Energy efficiency): Walls, roof, and floor must meet minimum U-value targets. Extension walls at 0.28 W/m²K and roofs at 0.18 W/m²K are the current standards.
• Part M (Access): New thresholds and floor levels should, where practicable, accommodate wheelchair access.
• Part P (Electrics): Any new electrical circuits within the extension must be notified and tested to current standards.

On the terraced and semi-detached housing common in Bury, Radcliffe, and Tottington, the Party Wall etc. Act 1996 often applies. If you are building on or near the shared wall, you must give your neighbour written notice before starting work. They have the right to appoint a party wall surveyor, whose fee you would normally bear. Many party wall matters proceed without dispute, but taking professional advice early costs far less than resolving a dispute once work has started.

What affects the cost of a house extension in Bury?

Size and number of storeys

The floor area of the extension is the biggest single driver of cost. A double storey extension adds bedrooms and bathrooms above the ground floor footprint, making it far better value per square metre than two separate single storey extensions built at different times. If your budget and PD limits allow, going double storey from the outset is almost always the more cost-efficient approach.

Ground conditions and foundations

Ground conditions vary across Bury. Parts of the lower-lying areas around Radcliffe and the Irwell Valley sit on softer ground that may need deeper strip foundations or engineer-designed pads. Higher ground in Ramsbottom and Greenmount is generally more stable but can encounter made ground or old mill-era infrastructure. A soil survey or engineer’s assessment before the design is finalised removes the risk of expensive surprises during groundworks.

Specification and glazing

The choice of roof finish, doors, and internal finishes has a significant effect on the final cost. A large glazed rear wall with bifold doors adds £4,000 to £10,000 over a standard window and door arrangement, but it transforms the feel of the space and typically improves resale value. A flat roof finish is the most cost-effective option; a pitched roof or glazed lantern adds £3,000 to £8,000.

Whether the kitchen is being extended or altered

Most rear extensions in Bury involve opening up or relocating the kitchen. A mid-range fitted kitchen adds £8,000 to £15,000; a high-specification kitchen with integrated appliances can reach £20,000 to £30,000. Structural alterations to the rear wall, including RSJ steel beams to open up the existing room, typically add £2,000 to £5,000 to the structural costs.

Planning route taken

A permitted development extension needs only a Building Control application. A Larger Home Extension prior approval adds a few hundred pounds in notification fees and four to eight weeks to the programme. A full planning application adds £548 in fees, architect time for a full planning pack, and typically eight to thirteen weeks for the decision. Choosing the right planning route from the outset saves both money and time.

Hidden costs to watch for

• Structural engineer’s report: Required before detailed design on most extensions. Budget £350 to £600 for a desktop or site assessment.
• Architect or designer fees: Even PD extensions benefit from a set of drawn plans. Expect 8 to 12% of the build cost, or £2,000 to £5,000 for a straightforward extension.
• Party wall surveyor: If a neighbour appoints their own surveyor, you cover their reasonable fees. Budget £700 to £1,200 per adjoining neighbour if this arises.
• Asbestos: Older Bury properties, particularly pre-1980 terraces in Radcliffe and Tottington, may have artex ceilings or floor tiles containing asbestos. If found during demolition, licensed removal adds £500 to £3,000 depending on the quantity.
• Drainage diversions: If the proposed extension sits over or close to an existing sewer or drain, a drain survey and possible diversion add cost and require a building over agreement from United Utilities.
• Landscaping and reinstatement: Garden reinstatement, new paving, and fencing following groundworks are often omitted from quotes. Allow £2,000 to £6,000 depending on the garden size.
• Furniture and finishes: Flooring, blinds, light fittings, and built-in storage are typically excluded from build quotes. Budget realistically for these finishing items before the project starts.

Extension types compared

Type	Typical Bury cost (2026)	Planning needed?	Best suited to
Single storey rear	£28,000 to £55,000	Usually not (PD)	Kitchen-diner enlargement on terraces and semis
Double storey rear	£55,000 to £90,000	Check (PD if within 3m and 7m from boundary)	Families needing extra bedrooms and living space
Side extension	£22,000 to £45,000	Check (PD if single storey, under half house width)	Semis in Whitefield and Prestwich with side access
Wrap-around	£45,000 to £80,000	Usually required	Maximum ground floor space from a single build
Larger Home Extension (prior approval)	£35,000 to £65,000	Prior approval only (not full planning)	Deeper rear extensions beyond standard PD limits

Extending across Bury’s towns and villages

Bury Metropolitan Borough covers a wide range of housing types and planning contexts. What is straightforward permitted development in Whitefield may need full planning permission in Ramsbottom or Summerseat.

Bury town

Bury town centre and its immediate suburbs contain a mix of Victorian terraces, 1930s semis, and post-war estates. The Bury Town Centre conservation area covers the historic market town core; properties within this boundary need to check PD entitlements carefully before assuming no application is needed. Outside the conservation area, standard PD rules apply and most terraced and semi-detached properties can extend to the 3-metre rear PD limit without difficulty.

Ramsbottom

Ramsbottom is one of the most sought-after residential destinations in the borough, with a strong market for Victorian stone terraces and detached properties on the hillsides. Almost all of central Ramsbottom falls within its conservation area, which means side extensions are not PD and materials must be sympathetic to the stone character. Extensions in the conservation area need a full planning application. Outside the designated boundary, the Victorian stone terraces suit rear extensions subject to the standard 3-metre PD limit, though Bury Council pays close attention to materials on any planning application in the town.

Whitefield and Prestwich

Whitefield and Prestwich offer some of the most popular residential streets in the borough, with large interwar and post-war semis and detached properties on generous plots. Detached homes here often have scope for deeper rear extensions under the 4-metre PD limit, and the Larger Home Extension scheme can allow 8-metre extensions on detached properties without a full planning application. Prestwich includes two conservation areas: Poppythorn and St Mary’s. The St Mary’s area also has an Article 4 direction removing certain additional PD rights. If your property is in either conservation area, confirm the planning position with Bury Council before committing to a design.

Radcliffe and Tottington

Radcliffe has a large stock of terraced housing, much of it Victorian or Edwardian. These properties suit rear kitchen extensions to create open-plan living space, subject to the 3-metre PD limit and party wall notice where the extension is built against the shared boundary. Ground conditions in parts of Radcliffe, near the Irwell Valley, can be variable and a drain survey before groundworks is advisable. Tottington, to the north, has a more rural character with a mix of older stone cottages and modern detached homes.

Summerseat and Greenmount

Summerseat falls within its own conservation area designation, so extensions that might otherwise be PD will need a full planning application. Bury Council values the village character highly, and design quality and choice of materials are important in any planning submission here. Greenmount, further north, sits outside any conservation area designation for most properties, making PD extensions more straightforward. Both villages attract buyers for their rural setting, and extensions that open up views of the surrounding landscape tend to be popular and are generally well received by Bury Council’s planning team.

Frequently asked questions

Do I need planning permission for a house extension in Bury?

Usually not for a straightforward single storey rear extension, provided you stay within the permitted development size limits: 3 metres from the original rear wall for a semi-detached or terraced house, or 4 metres for a detached house. You will always need planning permission if your property is listed, if it sits within one of Bury’s 12 conservation areas, or if the proposed extension exceeds the PD limits. Check your specific address using the conservation area information at bury.gov.uk or contact Bury Council’s planning team before finalising your design.

How deep can I extend my house in Bury without planning permission?

Under permitted development, a single storey rear extension can project 3 metres from the original rear wall on a semi-detached or terraced house, and 4 metres on a detached house. Under the Larger Home Extension prior approval scheme, these limits increase to 6 metres and 8 metres respectively, provided you notify Bury Council, neighbours are consulted, and no sustained objection is received. These limits measure from the original rear wall of the house. None of these PD rights apply in conservation areas or to listed buildings.

How much does a single storey rear extension cost in Bury?

A single storey rear extension in Bury costs between £28,000 and £55,000 in 2026 for a floor area of 20 to 30 square metres. Smaller extensions of 15 to 20 square metres run from around £22,000 to £38,000. The cost per square metre in Bury ranges from £1,400 to £1,900, broadly in line with other North West towns and significantly lower than London rates. The final cost depends on specification: bifold doors, underfloor heating, and a premium kitchen fitout will all push the total higher.

Can I extend a terraced house in Bury without planning permission?

Yes, in most cases. A terraced house in Bury can extend up to 3 metres to the rear under permitted development, or up to 6 metres using the Larger Home Extension prior approval scheme, provided the property is not in a conservation area and the other PD rules are met. Side extensions on terraced houses are more restricted under PD: they must be single storey, no more than 4 metres high, and no wider than half the original house width. A side extension that gives a terraced house the appearance of a semi-detached property will always require planning permission regardless of size.

Which conservation areas in Bury affect planning permission for extensions?

Bury Metropolitan Borough has 12 designated conservation areas: Ainsworth, All Saints Whitefield, Brooksbottoms and Rowlands, Bury Town Centre, Holcombe, Mount Pleasant, Poppythorn Prestwich, Pot Green, Ramsbottom, St Mary’s Prestwich, Summerseat, and Walmersley. If your property falls within any of these boundaries, permitted development rights for extensions are restricted, and side extensions always require full planning permission. Article 4 directions also apply in Holcombe and St Mary’s Prestwich, removing further PD rights in those specific areas. Source: Bury Council, bury.gov.uk.

Does a house extension always need building regulations approval in Bury?

Yes, always. Building regulations approval is required for every house extension in Bury, regardless of whether planning permission is also needed. The regulations cover structural safety, foundations, insulation and energy efficiency, fire safety, drainage, ventilation, and electrical work. Either Bury Building Control or a private approved inspector manages the process, inspecting the work at key stages and issuing a completion certificate when the project meets the required standards. Your contractor should include the Building Control application in their quote; if it is not mentioned, ask specifically before signing anything.

Cost disclaimer: All figures are indicative estimates based on North West England market data for 2026. Actual costs depend on your specific property, ground conditions, specification choices, and contractor. Renovat Construction will provide a fixed written quote following a free site survey. VAT at 20% applies to most extension work and is not included in the cost figures above.