How Much Does a Planning Application Cost in 2026?

Planning permission doesn't cost what you think it costs.

Most homeowners assume the council's application fee is the main expense. But the real cost of getting planning permission includes architect fees, engineer fees, potential amendments, and potentially agent fees if you hire a planning consultant.

Here's what actually goes into your final bill.

The Council's Application Fee

The local authority's application fee depends on the project size:

Project Type	Fee (2026)
Householder application (extension, alteration)	£206
Minor residential (e.g., 2-3 new houses)	£462
Larger development	Calculated per hectare (£110-150/hectare)
Full application for major development	£3,650+

Householder application (extension, alteration)	£206
Larger development	Calculated per hectare (£110-150/hectare)
Full application for major development	£3,650+

| Full application for major development | £3,650+ |

Most homeowners pay around £206-400 to the council for a householder planning application.

This is the smallest part of the total cost.

Architect or Designer Fees

This is where the real cost sits.

If you need an architect to design your project and prepare the planning drawings, expect:

Service	Typical Cost
Small extension design + planning drawings	£1,200-2,000
Medium extension or alteration	£2,000-3,500
Complex project (e.g., conversion, multiple changes)	£3,500-6,000
Full house redesign or listed building work	£5,000-10,000+

Small extension design + planning drawings	£1,200-2,000
Complex project (e.g., conversion, multiple changes)	£3,500-6,000
Full house redesign or listed building work	£5,000-10,000+

| Full house redesign or listed building work | £5,000-10,000+ |

These fees are usually 8-12% of the construction cost for straightforward projects.

Can You Skip the Architect?

Not easily. To submit a planning application, you need:

Existing site plans (measurements of your current house)

Proposed plans (the design you're applying for)

Elevations (front/back views showing how it looks)

Site location plan (your house on a map)

Design and Access Statement (explaining your choices)

You can prepare these yourself, but councils expect professional standards. Hand-drawn or amateur plans often get rejected or requested for resubmission. A resubmission means starting the clock again.

Structural Engineer or Surveyor Fees

If your project involves structural work (removing walls, supporting beams, roof work), you need an engineer's approval.

Service	Cost
Survey and structural design	£500-1,500
Specialist reports (e.g., flood risk, contamination)	£300-800
Arboricultural survey (trees on site)	£200-400
Party Wall surveyor (semi/terraced)	£800-2,000 (for all three surveyors)

Survey and structural design	£500-1,500
Arboricultural survey (trees on site)	£200-400
Party Wall surveyor (semi/terraced)	£800-2,000 (for all three surveyors)

| Party Wall surveyor (semi/terraced) | £800-2,000 (for all three surveyors) |Party Wall surveys are surprisingly expensive. If you're doing an extension in a semi-detached or terraced house, you must formally notify your neighbours under the Party Wall Act. The neighbour gets to appoint a surveyor, and you're paying for all three surveyors (yours, theirs, and an independent one if there's disagreement). Total: typically £800-2,000.

Planning Agent or Consultant Fees

If you hire a planning agent to manage the application (submit, liaise with council, handle queries), expect:

Service	Cost
Simple householder application management	£500-1,000
Standard application with liaison	£1,000-2,500
Complex application with amendments	£2,500-5,000

Simple householder application management	£500-1,000
Complex application with amendments	£2,500-5,000

| Complex application with amendments | £2,500-5,000 |

Most homeowners don't need an agent if they're working with an architect - the architect typically handles the submission and council correspondence.

You'd hire an agent if:

You're submitting your own design and need professional advice

The council raises queries you're unsure how to answer

The application faces objections and you need tactical guidance

Building Regulations Approval (Separate from Planning)

Once planning is approved, you also need Building Regulations approval. This is separate from planning permission and cannot be skipped.

Service	Cost
Building Control application fee	£400-900
Building Control inspector site visits (2-4 visits typical)	Included in above
Approved Inspector certificate (alternative to council)	£400-1,200

Building Control application fee	£400-900
Approved Inspector certificate (alternative to council)	£400-1,200

| Approved Inspector certificate (alternative to council) | £400-1,200 |

Building Control fees are charged by the council or a private Approved Inspector and vary by project cost and complexity.

Total for planning + Building Regulations: £600-1,500 in government fees alone.

Real-World Example: Small Rear Extension

Let's cost a typical rear extension:

1. Architect design + planning drawings: £1,500 2. Structural engineer survey: £600 3. Planning application fee: £206 4. Building Regulations application: £500 5. Building Regulations site inspections: Included 6. Total pre-construction: £2,806

If you also have semi-detached party walls:

7. Party Wall surveyor fees: £1,200 8. Total with party wall: £4,006

This is before a single brick is laid.

If the Council Asks for Amendments

Councils often request changes:

"Can you reposition the window?"

"We need a Design and Access Statement explaining the materials"

"Can you provide a tree survey?"

Minor amendments (adding a page to your statement, adjusting a plan) are usually free or a small fee from your architect (£100-300).

But significant changes (redesigning part of the project, adding new specialist surveys) can add £500-2,000 to the cost.

If Your Application Is Refused

If planning permission is refused, you have options:

1. Amend and reapply: Fix the reason for refusal and submit a new application (costs another £206 + architect changes) 2. Appeal to the Planning Inspectorate: This is free to lodge but typically requires professional representation (adds £1,500-3,000 in agent/architect costs)

Refusals are rare for straightforward extensions, but they do happen if the design conflicts with planning policy or neighbour objections are strong.

Money-Saving Tips

1. Start with Permitted Development

If your project qualifies for permitted development, you save the entire planning phase. You only need Building Regulations.

Use PlanCheck to see if you're eligible before spending on architect drawings.

2. Use a Competent Architect

A good architect designs to PD compliance initially, then optimises for planning if needed. Poor design means more amendments and delays.

It's worth paying a bit more upfront for experience.

3. Pre-Application Consultation

Before you design and submit, pay for a pre-application consultation with the council (typically £120-250). They'll tell you if your idea will get permission.

This sounds like extra cost, but it prevents wasted design fees if your plan won't be approved.

4. DIY Where Possible

If you're confident, you can prepare your own site plan (measure your house and draw to scale), take your own site photos, and write your own Design and Access Statement.

Many architects charge extra for these "extras" when they could be done by you.

5. Avoid Unnecessary Surveys

Don't pay for tree surveys, flood risk assessments, or specialist reports unless the council specifically asks for them during pre-application.

Some agents recommend these proactively "to be safe" - but they add cost without necessarily adding permission likelihood.

Typical Total Cost Range

For a straightforward householder project (small extension, alteration):

Scenario	Total Cost
Simple design, no complications	£2,000-3,500
Standard extension with party wall	£3,500-5,000
Complex project or multiple changes	£5,000-8,000

Simple design, no complications	£2,000-3,500
Complex project or multiple changes	£5,000-8,000

| Complex project or multiple changes | £5,000-8,000 |

This is before construction costs - which are an entirely separate category.

What's Missing from This Picture?

These costs assume straightforward projects. Additional costs appear if:

Listed building consent is needed (adds time and sometimes a specialist surveyor)

Conservation area restrictions require additional heritage assessment

Environmental impact assessment is triggered (rare but expensive)

Highways implications require traffic analysis (if access/parking changes)

Utilities relocation is needed (if drains or services cross the site)

These add £500-5,000+ depending on the project.

The Real Math

The council fee is just 5-10% of the real cost. The rest is professional fees to get you to a submission the council will actually approve.

Underbudgeting here means either:

Paying more than expected on a professional

Submitting amateur drawings that get rejected

Missing deadlines because you're unprepared

Budget at least £2,500 for a simple extension, more if there are complications.

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