Extension Plans in Manchester

Planning and Regulations · Manchester

Last updated 06/26 · 8 minute read · Renovat Construction

Reviewed by RICS and PMP certified project management

Getting extension plans drawn for a Manchester property requires two separate sets of drawings: planning application drawings submitted to your local planning authority, and building regulations technical drawings for building control sign-off. Planning drawings for a single-storey extension in Manchester typically cost £1,500 to £3,500, with building regulations drawings adding a further £1,500 to £3,000. Manchester City Council requires metric measurements and specific drawing scales, and will reject freehand or pencil submissions.

What extension plans actually means

When most people search for extension plans, they mean one of two things: architectural drawings to obtain planning permission, or the full technical package needed to build the extension legally and safely. These are not the same document, and you almost always need both.

Every extension that needs planning permission requires planning application drawings: the set of plans you submit to your local planning authority. In Manchester that is Manchester City Council. For properties in surrounding boroughs it is Salford City Council, Stockport Metropolitan Borough Council, Bury Metropolitan Borough Council, Rochdale Metropolitan Borough Council, Bolton Metropolitan Borough Council, and so on. These drawings show what you intend to build, where it sits on the plot, and how it relates to the existing building and its surroundings.

Most extensions also require building regulations drawings, produced separately for building control. Where planning drawings show the shape and appearance of the extension, building regulations drawings show how it will be constructed to meet the technical standards covering structure, insulation, ventilation, drainage, and fire safety.

The planning authority and building control are separate processes, often running in parallel, each requiring its own set of documents and fees. Commissioners are often surprised to discover that planning approval does not mean they can start building: building control approval is a separate gate.

Do you need planning permission for your extension?

Not all extensions need a planning application. Under Class A of Schedule 2 to the Town and Country Planning (General Permitted Development) (England) Order 2015, many house extensions qualify as permitted development. This means you can build without applying for planning permission, provided you stay within the limits set out in the legislation.

Permitted development limits for house extensions in England

Extension type	Detached house	Terraced or semi-detached
Single-storey rear (standard PD, no notification needed)	Up to 4m beyond rear wall	Up to 3m beyond rear wall
Single-storey rear (Larger Home Extension, Prior Approval required)	Up to 8m beyond rear wall	Up to 6m beyond rear wall
Two-storey rear (standard PD)	Up to 3m; min 7m from rear boundary	Up to 3m; min 7m from rear boundary
Side extension (single storey only under PD)	Max width half the original house; max 4m height
Within 2m of any boundary	Eaves height cannot exceed 3m

Source: Class A, Schedule 2 to the GPDO 2015 (legislation.gov.uk/uksi/2015/596), confirmed by the Planning Portal householder technical guidance.

Permitted development rights are removed if your property is on Article 2(3) land, which includes all conservation areas, National Parks, and Areas of Outstanding Natural Beauty. Several Manchester neighbourhoods also have Article 4 Directions in place, which remove additional PD rights beyond the standard restrictions. Always confirm with your borough’s planning department before assuming permitted development applies. If you want written confirmation from the council, apply for a Lawful Development Certificate (the fee is the same as a householder planning application, currently £548).

The Larger Home Extension (Prior Approval) route

If your proposed single-storey rear extension goes beyond the standard PD limits (3m or 4m) but stays within the larger limits (6m or 8m), you do not need a full planning application. Instead, you notify the council via the Larger Home Extension Prior Approval procedure.

This process requires the council to consult immediately neighbouring properties (those sharing a boundary with the proposed extension). Neighbours have a minimum of 21 days to raise objections. The council then has 42 days from your notification to determine whether prior approval is needed, assessing the impact on neighbouring amenity. If the council does not respond within 42 days, development is deemed permitted by default.

The fee for a Prior Approval notification from 1 April 2026 is £249, confirmed by SI 2025 No. 342 (The Town and Country Planning (Fees for Applications, Deemed Applications, Requests and Site Visits) (England) (Amendment and Transitional Provision) Regulations 2025). This is considerably cheaper than a full planning application and the timeline is shorter, but it only applies to single-storey rear extensions within the larger limits. Two-storey extensions, side extensions exceeding PD limits, and any extension in a conservation area still need a full planning application.

You still need extension plans drawn for a Prior Approval notification. The council must be able to see the proposed dimensions and relationship to boundaries clearly.

What drawings Manchester City Council requires

Manchester City Council publishes its drawing and plan requirements for householder planning applications. The minimum drawing set for a house extension application is as follows.

• Location plan at 1:1250 or 1:2500 scale, based on an Ordnance Survey map, showing at least two named streets, surrounding properties with house numbers, and a red line drawn around the entire property boundary (including the garden, not just the extension footprint). Any other land you own nearby is outlined in blue.
• Site plan (block plan) at 1:100 scale (or 1:50 if that matches the elevation drawings), showing the proposed extension in relation to boundaries and neighbouring buildings.
• Existing and proposed floor plans at 1:50 or 1:100, showing the current layout and the proposed layout with the extension included.
• Existing and proposed elevations at 1:50 or 1:100 for all elevations affected by the extension. These must show the relationship between existing windows and door openings and the proposed changes.
• Sections where relevant, particularly if the extension involves changes in floor level or complex roof geometry.

Manchester City Council rejects applications that use freehand or pencil drawings, omit metric dimensions, lack a scale bar on each drawing, or fail to use Ordnance Survey mapping for the location plan. All dimensions must be in metric; imperial measurements are not accepted.

In addition to the drawings you need: the completed application form (submitted via the Planning Portal at planningportal.co.uk), the householder planning fee of £548 (from 1 April 2026, as set by SI 2025 No. 342), an ownership certificate, and heritage information if the property is in a conservation area or is listed.

Building regulations drawings

Planning permission and building regulations are entirely separate processes. Planning approval confirms the shape, size, and appearance of your extension are acceptable to the local planning authority. Building regulations approval confirms the structure meets the technical performance standards set out in the Building Regulations 2010 (as amended).

Most house extensions require building regulations approval. The exemptions are narrow: a single-storey ground-floor conservatory or porch that is physically separated from the main house by external-quality doors, and where the glazing meets the requirements of Approved Document K, may be exempt. Standard solid extensions are not exempt.

Building regulations drawings are more technical than planning drawings. For a house extension they typically include:

• Foundation details, including depth, width, and type to suit the ground conditions on your specific site
• Structural details covering beam sizes, wall construction, roof structure, and lintels
• Insulation specification to meet Part L thermal performance requirements
• Ventilation details (mechanical or natural, to meet Part F)
• A drainage plan showing how the new extension connects to existing drainage
• Fire safety provisions where relevant to the design

You can submit a Full Plans application to building control (response within 15 working days; approval valid for 3 years) or use a Building Notice (faster to start but gives the inspector discretion to require design changes mid-build). For most extension projects a Full Plans application is the better route because it catches structural and technical issues before work starts, avoiding costly mid-build corrections.

You can use Manchester City Council Building Control or appoint a private registered building control approver. Both routes are valid under the Building Safety Act 2022 and the updated regulatory framework it introduced.

Who draws extension plans?

Three types of professional produce extension plans for Manchester homeowners. Each suits a different kind of project.

Type	Qualification	Best for	Typical planning drawing cost
Architectural technician	CIAT member	Most domestic extensions; planning application and building regulations drawings	£1,500 to £3,500
Chartered architect	ARB registered, usually RIBA member	Complex or design-led projects; listed buildings; sensitive conservation area sites	£2,500 to £6,000
Design-and-build company	Varies	Straightforward extensions where one point of contact manages design and construction	Plans typically included in the build quote

An architectural technician, a member of the Chartered Institute of Architectural Technologists (CIAT), is fully qualified to produce council-compliant planning drawings and building regulations drawings for a standard house extension. Only someone registered with the Architects Registration Board (ARB) can legally call themselves an “architect” in the UK, but that title is not a requirement for producing extension plans. Chartered architects bring design expertise and are the right choice for complex projects, conservation area submissions, and listed building work.

When appointing anyone to draw your extension plans, ask to see examples of applications they have submitted to your specific local planning authority, and check whether their drawing package covers all the documents on the council’s validation checklist. An incomplete submission that fails validation delays your application by several weeks.

What extension plans cost in Manchester

Item	Typical cost
Planning application drawings (architectural technician)	£1,500 to £3,500
Planning application drawings (chartered architect)	£2,500 to £6,000
Building regulations drawings (in addition to planning drawings)	£1,500 to £3,000
Planning application fee (householder, England, from 1 April 2026)	£548
Prior Approval (Larger Home Extension) fee (from 1 April 2026)	£249

Total plan costs for a typical single-storey rear extension in Manchester using an architectural technician for both planning and building regulations drawings run from roughly £3,000 to £6,500. Add the planning fee, the building control fee (set by the council or your appointed private approver), and the full pre-build design and approvals budget is typically £4,000 to £9,000 before any building work starts.

For a straightforward permitted development extension that does not need a planning application, you still need building regulations drawings. These alone typically cost £1,500 to £3,000.

Some design-and-build companies include planning drawings in their overall build quote. This can reduce upfront costs but make sure you see the drawing package before any planning submission so you can confirm it meets the council’s validation requirements.

Timeline: from plans to planning decision

The most common frustration among Manchester homeowners is discovering that commissioning drawings does not mean permission to build is imminent. Each stage has its own timeframe.

Stage	Typical duration
Design brief and drawings production	3 to 6 weeks
Planning application validation by the council	1 to 2 weeks after submission
Council determination (householder applications)	8 weeks statutory target from validation
Prior Approval (Larger Home Extension) determination	Up to 42 days from notification
Building regulations Full Plans approval	15 working days
Total from initial brief to build-ready (planning route)	3 to 5 months

Planning applications are frequently delayed at the validation stage by incomplete drawing sets. The most common validation failures are a missing or incorrectly drawn location plan, drawings at non-standard scales, or an omitted ownership certificate. Getting the drawing package right before submission is the single most effective way to shorten the overall timeline.

Building regulations drawings can be submitted and approved in parallel with the planning process, so both approvals can sometimes be in hand before the planning decision is even issued.

Conservation areas and Article 4 directions

If your property is in or near a conservation area, your extension plans need to work harder and your planning application will require additional supporting information.

Properties on Article 2(3) land (which includes all conservation areas, National Parks, and Areas of Outstanding Natural Beauty) lose certain permitted development rights under Class A of the GPDO 2015. In conservation areas specifically:

• Side extensions are not permitted under PD rights and need a planning application
• Multi-storey rear extensions under Class A PD rights are not permitted
• Cladding the exterior with stone, artificial stone, pebble dash, render, timber, plastic, or tiles requires planning permission regardless of size

Manchester City Council has designated a number of conservation areas across the city. Some neighbourhoods within the Manchester borough also have Article 4 Directions that remove further PD rights beyond the standard conservation area restrictions. Always check with Manchester City Council’s planning department before commissioning your drawings if you are in or close to a conservation area, because the brief to your designer will be different from a standard site.

In a conservation area, your planning drawings may need to be accompanied by a Heritage Statement or Design and Access Statement explaining how the proposed extension preserves or enhances the character and appearance of the area. This adds to the drawing and professional fees but is essential for a successful application. Your designer should have experience submitting to the specific conservation area in question.

Surrounding boroughs have their own designations. Stockport Metropolitan Borough Council has 37 conservation areas across the borough. Salford City Council has separate restrictions in its own conservation areas including Ordsall and Weaste. Check with the specific local planning authority for your property.

Frequently asked questions

Do I need an architect to draw extension plans in Manchester?

No. Only a person registered with the Architects Registration Board (ARB) can legally call themselves an architect in the UK, but this title is not required to produce extension plans. An architectural technician who is a member of the Chartered Institute of Architectural Technologists (CIAT) is fully qualified to produce compliant planning application drawings and building regulations drawings for most domestic house extensions. A chartered architect is advisable for complex designs, listed buildings, or sensitive conservation area sites where design expertise and planning authority relationships matter.

Can I draw my own extension plans and submit them to Manchester City Council?

You can, but Manchester City Council rejects freehand or pencil-drawn plans and requires drawings at specified scales with scale bars, Ordnance Survey mapping for the location plan, and metric dimensions throughout. In practice, the cost of having an architectural technician produce the drawings is modest relative to the planning fee already being paid and the cost of the build, and a professionally drawn set is far less likely to fail validation or attract a refusal on design grounds.

How much does a householder planning application cost in Manchester in 2026?

The householder planning application fee in England is £548 from 1 April 2026, set by SI 2025 No. 342 (The Town and Country Planning (Fees for Applications, Deemed Applications, Requests and Site Visits) (England) (Amendment and Transitional Provision) Regulations 2025). This fee is paid to the council and is non-refundable regardless of whether the application is approved or refused. If you are using the Prior Approval (Larger Home Extension) route, the fee is £249 from the same date.

How long does a planning application for a house extension take in Manchester?

Manchester City Council aims to determine householder planning applications within 8 weeks of the application being validated and registered. Validation typically takes 1 to 2 weeks after submission. Allow 10 to 12 weeks from submission to decision in practice. Applications can take longer if the council raises queries or requests additional information, which is more likely if drawings are incomplete or the proposal sits in or near a conservation area.

Do I need building regulations approval as well as planning permission?

Yes, almost always. Planning permission and building regulations approval are two separate processes. Planning permission confirms the council is satisfied with the appearance, scale, and impact of your extension. Building regulations approval confirms the structure meets the technical standards for structural integrity, insulation, ventilation, drainage, and fire safety set out in the Building Regulations 2010. Most extensions require both, and the two sets of drawings needed for each approval are different documents produced to different specifications.

What happens if my extension plans are refused by Manchester City Council?

A refused planning application does not prevent you from trying again. You can resubmit within 12 months of a refusal without paying a full second application fee, provided the resubmission directly addresses the stated reasons for refusal. Alternatively, you can appeal the decision to the Planning Inspectorate, though householder appeals typically take 6 to 12 months to resolve. The most common reasons for refusal are scale or massing that the council considers harmful to neighbouring amenity, designs that fail to respect the character of the area, and applications in conservation areas that do not provide adequate heritage justification.

Cost disclaimer: drawing and professional fees quoted above are based on Renovat Construction’s project experience and current market rates in Manchester as of June 2026. Planning and Prior Approval fees are set by national regulation (SI 2025 No. 342) and apply uniformly across England. Building control fees vary by council and project size. All cost figures are indicative guides only.