15 min read
Most homeowners starting an extension or renovation project ask one of two questions: ‘Do I need planning permission?’ or ‘Do I need building regulations?’ The honest answer, in most cases, is that you need to ask both questions — and get two separate answers. National guidance tends to treat this as a London problem, with examples drawn from conservation areas in Islington or listed terraces in Bath. If you own a semi in Gateshead, a stone cottage in Northumberland or a townhouse in Durham, the specifics look a bit different. This post is written for those properties and those planning authorities.
In Short: The Honest Summary
Planning permission and building regulations are two entirely separate legal regimes. One controls whether your project is acceptable; the other controls how it is built. Most North East extensions and significant renovations need both, or formal written confirmation that one of them does not apply.
For a typical single-storey rear extension of around 20–25 m² to a house in the North East in 2025–26, the statutory fees alone sit at roughly:
- Planning permission (householder application): £528 statutory fee, rising to around £580–£610 once the Planning Portal service charge is added.
- Building regulations (local authority, full plans route, 10–40 m²): approximately £722 in Durham — £241 for plan checking and £481 for inspections.
- Combined statutory fees: roughly £1,300–£1,350 before any design, structural engineering or construction costs.
That is the baseline. Everything else in this post explains what is behind those numbers, what can push them up, and where homeowners typically come unstuck.
How This Topic Is Usually Presented — and Where That Misleads
The way planning permission and building regulations are explained online tends toward one of two problems. Either the explanation is so high-level it tells you nothing useful (‘you may need planning permission for larger extensions — check with your local council’), or it collapses the two regimes into one vague concept called ‘permissions’, leaving homeowners to discover the distinction only when a solicitor flags it during a house sale.
The most damaging misconception is this: that getting planning permission from the council means the project is approved and can be built. It does not. Planning permission is consent to carry out development. Building regulations approval is a separate legal requirement confirming that the work meets the required technical standards. A project can have full planning permission and still be entirely illegal to build if building regulations approval has not been obtained and the work does not comply.
The reverse is also true: a project can be technically impeccable — perfectly insulated, structurally sound, signed off by a structural engineer — and still be refused planning permission because of its scale, its impact on a neighbour’s light, or its appearance in the street scene. Consent and compliance are independent of each other. They always have been.
What Planning Permission Actually Controls
Planning permission is about land use, appearance, scale and impact. The planning system asks, in effect: should this be built here, in this way, given its effect on the surrounding area and on other people?
In practical terms, a planning officer assessing a North East extension application will look at:
- The scale and massing of the extension relative to the original house and neighbouring properties.
- Whether the extension causes unacceptable overlooking or overshadowing of adjacent gardens or windows.
- The design and materials, and whether these are appropriate to the street scene.
- Any change of use — converting part of a house into a self-contained annexe, for example, or splitting a house into flats.
- Whether the property sits in a conservation area or is a listed building, both of which impose stricter controls.
Planning permission does not assess foundations, structural beams, insulation values or whether your electrics comply with current standards. Those are building regulations matters entirely.
When North East homeowners typically need planning permission
Permitted development rights allow certain works without a formal planning application, but they have limits that catch people out regularly. You will generally need to apply for planning permission in the North East for:
- Rear or side extensions that exceed the permitted development size limits — particularly anything over 4 m depth for a detached house or 3 m for other house types (and larger under the neighbour consultation scheme, subject to conditions).
- Two-storey extensions that face a highway or materially change the front elevation.
- Loft conversions with dormers on the front roof slope, or where the proposed volume exceeds permitted limits.
- Any conversion creating a separate dwelling or self-contained unit.
- Works to listed buildings or within conservation areas — Northumberland and Durham both have extensive designations that catch rural properties that owners sometimes assume are straightforward.
The statutory householder planning fee in England from April 2025 is £528. This applies equally whether you are applying to Newcastle City Council, Northumberland County Council, Durham County Council or any other North East authority. Local councils cannot set different statutory planning fees. Online submission through the Planning Portal typically adds a service charge of around £30–£85, bringing a standard householder extension application to approximately £580–£610 all in.
A Section 73 application — used to vary a condition on an existing planning permission — carries a specific householder fee of £86 under the 2025 fee structure.
Determination time for householder applications is typically around eight weeks, though pre-application discussions with the relevant local authority can reduce the risk of a refusal and are worth considering for anything with complexity or sensitivity.
What Building Regulations Actually Control
Building regulations are about technical compliance. They set the minimum standards for how building work must be designed and constructed, covering structural safety, fire safety, insulation and energy efficiency, drainage, ventilation, and the safety of electrical and plumbing installations.
A building control officer — whether from the local authority or a private approved inspector — will check things like:
- Foundation design, load-bearing walls, steel beams and roof structures.
- Fire doors, escape routes, compartmentation and alarm provision.
- U-values, air-tightness and compliance with the energy efficiency requirements of Part L.
- Drainage layouts and the separation of foul and surface water.
- Stair geometry, structural floor design and headroom in loft conversions.
When North East homeowners typically need building regulations approval
Building regulations approval is required for most structural or significant renovation work, regardless of whether planning permission is needed. This includes:
- Single- and two-storey extensions of any material size.
- Garage conversions — new insulation, drainage connection and any structural alterations all trigger the requirement.
- Loft conversions involving new structural floors, staircases, steel beams and fire protection.
- Removing a load-bearing wall or installing a steel beam (RSJ).
- Major re-roofing or significant changes to roof structure.
- New window or door openings where the structural opening is altered.
A common assumption is that permitted development status removes the need for building regulations. It does not. Permitted development only means you do not need a planning application. The building regulations requirement is entirely separate and still applies.
Routes to Building Regulations Approval
There are three main routes, each with different implications for cost, risk and programme:
Full plans application
Detailed technical drawings, structural calculations and specifications are submitted to building control before work starts. Plans are checked for compliance, comments are returned, and site inspections take place at key stages during construction. This is the most thorough route and gives both the homeowner and the contractor the greatest certainty. For premium projects, it is usually the right choice.
Building notice
Less upfront paperwork. You notify building control and work begins, with inspections carried out as construction proceeds. It suits straightforward domestic extensions with experienced contractors, but because detailed drawings are not checked in advance, problems can emerge on site. It is not suitable for complex structural schemes.
Regularisation
A retrospective application for work that has already been carried out without building regulations approval. It is always more expensive than the standard routes, often requires opening up of completed work so inspectors can check what is concealed, and in some cases cannot result in approval if standards cannot be demonstrated. It is worth understanding what regularisation costs before deciding to skip the approval process.
North East Building Control Costs: 2025–26 Figures
Building control fees are set locally by each authority, so they vary across the North East. Durham County Council’s 2025–26 schedule provides a useful and current regional benchmark. Newcastle, Gateshead and Northumberland will differ, but the order of magnitude is comparable.
| Extension type | Full plans fee | Inspection fee | Building notice (combined) | Regularisation |
|---|---|---|---|---|
| Single-storey, up to 10 m² | £241 | £241 | £481 | £606 |
| Single-storey, 10–40 m² | £241 | £481 | £722 | £902 |
| Single-storey, 40–100 m² | £241 | £688 | £928 | £1,148 |
| Two-storey, up to 40 m² | £241 | £683 | £923 | £1,148 |
| Two-storey, 40–100 m² | £241 | £854 | £1,095 | Individually determined |
Extensions exceeding 100 m², or those under 5 m², are charged on an individually determined basis in Durham — and this is common practice across North East councils. If your project sits in those ranges, request a fee quote directly from your local building control team before budgeting.
The overall picture for a typical North East extension: building control fees broadly run from around £500 to over £1,100 depending on size, number of storeys and whether a retrospective regularisation application is involved.
What Pushes Costs Up
Beyond the baseline fees, several factors regularly add to the total approval cost for North East homeowners:
- Conservation area or listed building status: Listed building consent is required separately from planning permission for works to a listed building or its curtilage. Conservation area applications can require more detailed design justification and often take longer. Northumberland and Durham have significant rural conservation designations that affect properties owners do not always realise are subject to tighter controls.
- Structural complexity: A project involving multiple load-bearing wall removals, long-span steel beams or significant roof restructuring will require a structural engineer, whose calculations are submitted alongside the building regulations application. Engineer fees for domestic projects in the North East typically run from around £500 to £1,500+ depending on complexity.
- Pre-application advice: Most North East local planning authorities charge for pre-application discussions. These are not statutory fees and vary by council, but they can range from around £100 to several hundred pounds for householder projects. They are often worth it for sites with any planning sensitivity.
- Section 73 applications: If planning conditions need to be varied after approval — to amend an external material or adjust a condition about hours of working — a Section 73 application costs £86 under current fee levels. Minor and trivial these are not always, but the fee is modest compared with a fresh full application.
- Regularisation premium: As the Durham figures above show, regularisation consistently costs around 25–60% more than the standard routes. It also carries the risk that the work cannot be approved at all. Skipping proper approval to save time is rarely cheaper in practice.
Hidden Costs Nobody Quotes You For
The statutory fees are the visible part. A number of other costs tend to emerge during the process that quotations and online guides rarely mention upfront:
- Topographical or measured surveys: Planning applications require an accurate location plan and, for more complex schemes, a measured survey of the existing building. If your architect or designer does not hold existing drawings, a measured survey is needed. Budget from around £500–£900 for a typical North East semi or terraced house.
- Party wall matters: Extensions close to or on a shared boundary, or involving excavations near a neighbouring foundation, may trigger the Party Wall etc. Act 1996. Serving notices is a legal requirement separate from planning and building regulations. If a neighbour dissents or requires a party wall award to be drawn up, surveyor costs can run from £700 to over £2,000 depending on the number of surveyors involved.
- Drainage design: Building regulations require compliant drainage layouts, including separation of foul and surface water where practicable. If your drainage layout is unknown or complex, a drainage survey or CCTV investigation may be required before detailed design can proceed.
- Structural opening works for building control inspection: Under a building notice route, inspectors may require exposed sections of completed work — particularly around foundations, wall ties or concealed steelwork — before they can sign off. Opening up completed plasterwork or floor finishes is a real cost that the building notice route can sometimes generate that the full plans route avoids.
- Completion certificates and sign-off delays: Without a final completion certificate from building control, future mortgage applications and property sales can stall. Chasing a completion certificate on a job where inspections were missed is a cost in time and sometimes in remedial work. It is also a negotiating problem at the point of sale.
Why the North East Is Not the Same as the Rest of England
National guides treat planning permission and building regulations as though local geography is irrelevant. In the North East, several factors genuinely shape how these regimes play out:
- Conservation area and listed building prevalence: Northumberland alone has a large number of conservation areas, including historic market towns and villages where even minor works require careful design justification. County Durham has extensive areas of former industrial and agricultural heritage. Homeowners in these areas face a more involved planning process than the national averages suggest.
- Local authority building control teams: Durham County Council, Newcastle City Council and Northumberland County Council each operate their own building control functions with their own fee schedules and inspection regimes. Response times and the detail of pre-submission engagement vary. Knowing which team you are dealing with, and having a relationship with them, matters more than most homeowners realise.
- Ground conditions: Parts of the North East — particularly in areas underlain by former mining activity — can present foundation challenges that directly affect building regulations compliance. Where made ground, shallow mine workings or previous subsidence is a concern, structural engineers may require more detailed ground investigation reports. This is an additional cost that does not appear on any fee schedule.
- Material and labour context: Building regulations compliance is about minimum standards, but achieving those standards in a North East climate — with its exposure to driving rain and cold — means the detail of specification matters. Cavity wall insulation performance, roof drainage design and air-tightness detailing that performs in coastal Northumberland is not always the same specification as for a sheltered suburb in the South East.
A Worked Example: Single-Storey Rear Extension in the North East
To make this concrete, here is a realistic worked example for a single-storey rear extension of approximately 22 m² to a semi-detached house in County Durham. The extension extends beyond permitted development limits and requires a formal planning application.
| Item | Cost (approximate) |
|---|---|
| Householder planning application (statutory fee) | £528 |
| Planning Portal online service charge | £65 |
| Building regulations — full plans route (Durham, 10–40 m²): plans + inspections | £722 |
| Structural engineer (beam design, foundation specification) | £650–£900 |
| Measured survey of existing property (if required) | £600–£800 |
| Party wall notice service (if applicable) | £0–£250 (notices only, no dispute) |
| Realistic total for approvals and professional inputs (before construction) | £2,565–£3,265 |
This is the cost of getting the project properly approved and technically designed before a single brick is laid. It is not optional. It is the foundation on which a safe, legal and mortgageable extension is built. Homeowners who try to compress or skip elements of this process consistently find that the saving at the start costs considerably more to resolve later.
How to Compare Quotes and Check You Are Covered
When you receive quotations from architects, designers or contractors for an extension or renovation project, the following checks will help you understand whether planning permission and building regulations are being properly handled:
- Ask specifically what approvals are included in the fee. Does the fee cover the planning application submission and management, or just the drawings? Does it include building regulations drawing preparation and submission, or does that come separately? These are different scopes of work and the difference in fee can be substantial.
- Ask whether the statutory fees are included or additional. The £528 planning fee and the building control fee are paid to the council and are separate from any professional fee. Some practices include them in a fixed project fee; others list them as disbursements. Make sure you know which applies.
- Ask which building regulations route is proposed. Full plans or building notice? For a project of any complexity, full plans gives you better protection. If a contractor suggests building notice and you are not sure why, ask them to explain the reasoning.
- Ask who is responsible for obtaining the completion certificate. The completion certificate from building control is the final sign-off that the work complies. Confirm in writing who is responsible for ensuring inspections are called and the certificate is obtained. This document is needed when you sell the property.
- Ask whether party wall requirements have been assessed. This is often overlooked in early quotations. If your extension sits within 3 m of a neighbouring property or involves excavations near a shared boundary, party wall notices may be required and this needs to be factored into the programme.
- Check whether the quote covers any pre-application advice with the planning authority. For sites in conservation areas or where there is any planning sensitivity, pre-application discussions are worth having. Confirm whether this is included or whether it is an additional cost.
Common Misconceptions, Addressed Plainly
A few misunderstandings come up repeatedly. They are worth stating clearly:
‘Planning permission covers building regulations.’ It does not. They are entirely separate legal requirements. A planning approval notice makes no reference to building regulations compliance, and building control does not care about your planning permission when assessing structural or fire safety matters.
‘If it is permitted development, I do not need building regulations.’ Permitted development only removes the requirement for a planning application. Building regulations still apply to any structural or significant work, regardless of planning status.
‘My builder will sort all the approvals.’ Builders can and often do manage building control notifications and inspections. Some manage planning submissions. But the legal responsibility for ensuring both planning permission and building regulations approval are in place rests with the homeowner as the property owner. A good design and build team manages this on your behalf, but the duty is yours.
‘I can sort approvals out if I sell.’ You can apply for regularisation, but it costs more, it may require invasive opening-up works, and in some cases it cannot result in approval if compliance cannot be demonstrated retrospectively. Solicitors acting for buyers routinely flag missing building regulations certificates and it can delay or derail sales. Dealing with approvals properly at the time of construction is always the better path.
How Hollinside Manages Both Regimes
Our approach separates consent and compliance deliberately, because they require different expertise and run on different timelines. Early in any project we assess what is needed: does this require a planning application, or does it fall within permitted development and need only a written confirmation to that effect? At the same time, we identify what building regulations submissions will be needed and begin scoping the technical design accordingly.
We manage planning applications at the current 2025–26 statutory fee level and coordinate directly with local authority or private building control teams across the North East — whether that is Durham County Council, Newcastle City Council, Northumberland County Council or others. We use the full plans route as standard on projects of any complexity, because it gives our clients, our structural engineers and our site teams the clearest possible brief before work begins.
The aim is to arrive at the construction stage with both consent and compliance secured — clear planning permission or a permitted development confirmation, and an agreed set of building regulations drawings with a building control officer who knows the project. That is the position from which a well-run renovation or extension starts.
If you are wondering whether your specific project needs planning permission, building regulations approval, or both — and what the realistic cost and programme looks like — that is a practical conversation we can have early, without any commitment on your part.
Coming Up Next
This post has focused on the distinction between planning permission and building regulations, and why most North East extension projects need both. If you want to go deeper on the building regulations side specifically — exactly which extension types trigger the requirement, what the inspection process looks like stage by stage, and what happens if work is carried out without approval — we are putting together a dedicated post on that shortly. Look out for Do You Need Building Regulations for a House Extension?, which will cover the detail that this post has deliberately kept at overview level.
Talk to Hollinside When You Are Ready
Hollinside works across Newcastle, Gateshead, Northumberland and County Durham on residential renovation and extension projects. We take on a small number of projects at any one time, which is how we maintain the level of involvement that premium work requires. If you have a project in mind and want a straight conversation about what it needs — in terms of consent, compliance and realistic cost — we are happy to have it. No pressure, no pitch.
Last updated: July 2025. All figures are current guidance based on published fee schedules and national planning fee regulations in force from April 2025. They are not a quotation for any specific project. Fees and requirements should be verified with the relevant local authority before committing to a programme or budget.