Do I need planning permission
for a house extension in Teesside?
Clear, plain-English answers for every extension type. Select your extension below and get the exact rules that apply to your property in Middlesbrough, Stockton, Redcar, and Hartlepool — including when you need planning permission, when you don’t, and what we recommend.
Planning permission for house extensions in Teesside — the short answer: Most rear single storey extensions, loft conversions, garage conversions, and porches in Teesside do not need planning permission and qualify for Permitted Development. Side single storey extensions qualify if no wider than half the original house. Two storey side extensions always require full planning permission. Properties in conservation areas (including parts of Linthorpe, Yarm, Guisborough, and Saltburn) have tighter restrictions. A Lawful Development Certificate is recommended for all Permitted Development works — it protects you when you sell. Select your extension type below for the specific rules.
Rear Single Storey Extension
Do I need planning permission for a rear single storey extension in Teesside?
Route 1 — most common
Permitted Development — no planning needed
Up to 4m from the original rear wall (detached) or 3m (semi/terraced). No application to the council required. An LDC is strongly recommended.
Route 2 — bigger extension
Prior Approval — Larger Home Extension Scheme
Between 3–8m (detached) or 3–6m (semi/terraced). Council notifies neighbours for 21 days then approves. Fee: £249 Takes 6 weeks.
Route 3 — conservation area or over limit
Full planning permission required
Extension exceeds all limits, or property is in a conservation area (Linthorpe, Yarm, Guisborough, Saltburn etc.). Full application, £528 fee, 8 week decision.
| Property type | Standard PD limit | Prior Approval limit | Max height at eaves (within 2m of boundary) |
|---|---|---|---|
| Detached house | 4 metres | 8 metres | 3 metres |
| Semi-detached house | 3 metres | 6 metres | 3 metres |
| Terraced house | 3 metres | 6 metres | 3 metres |
| Conservation area | Full planning permission always required regardless of depth | ||
The measurement is taken from the original rear wall of the house — not from any previous extension. If a previous owner added a 2m extension and you want to add a further 2m, the total is 4m. On a semi-detached house the 3m PD limit means this combined 4m total would require Prior Approval. Previous extensions always count.
Linthorpe, Yarm, Norton, Guisborough, Saltburn, Staithes, and Hartlepool Headland are all have conservation areas where tighter rules apply. Call us on 07468 455796 if you’re unsure whether your street is in a conservation area — we check this for free.
💡 Our recommendation: Even when no planning application is needed, always obtain a Lawful Development Certificate (£258 council fee, 8 weeks). Solicitors and mortgage lenders require this when you sell. We include LDC applications in our standard rear extension drawing package.
Single Storey Side Extension
Do I need planning permission for a single storey Side extension in Teesside?
Standard residential areas
Permitted Development — if within width limit
Extension must be no wider than half the width of the original house. Single storey only. Max height 4m. Not in a conservation area.
Conservation areas — always
Planning permission required
In conservation areas (Linthorpe, Yarm, Norton, Guisborough, Saltburn etc.), all side extensions require full planning permission — regardless of size or width.
The measurement is taken from the original rear wall of the house — not from any previous extension. If a previous owner added a 2m extension and you want to add a further 2m, the total is 4m. On a semi-detached house the 3m PD limit means this combined 4m total would require Prior Approval. Previous extensions always count.
| Rule | Permitted Development limit |
|---|---|
| Maximum width | No more than half the width of the original house (measured from outside face) |
| Maximum height | 4 metres (single storey only) |
| Projection | Must not project in front of the principal elevation or any side elevation fronting a highway |
| Conservation areas | Side extensions are not permitted under PD — full planning required |
| Two storey side | Never PD — see below |
The half-width rule catches many homeowners out. If your original house is 8 metres wide, a side extension can be no more than 4 metres wide under PD. Previous side extensions count — if a side extension was already added, the remaining PD allowance may be much smaller than you expect.
Side return extensions (filling in the narrow alleyway beside Victorian and Edwardian terraced houses) almost always fall within the half-width rule and are a popular PD project. The council is still involved via the LDC process, but no formal planning assessment is made.
Rear Two Storey Extension
Do I need planning permission for a rear two storey extension in Teesside?
Can be PD — but conditions are strict
Permitted Development — if garden is deep enough
Max 3m depth AND at least 7m from the rear boundary. Height must not exceed existing roof. Upper-floor side windows must be obscure glazed.
Most Teesside properties
Planning permission required
Most Teesside semi-detached and terraced properties don’t have gardens deep enough to meet the 7m rule. Full planning application required
Conservation areas
Planning always required
Two storey rear extensions on designated land (conservation areas, AONBs) are excluded from PD — full planning application required regardless of size.
A two storey rear extension delivers roughly double the floor space of a single storey for about 40–60% more cost — because foundations, structure, and roof are shared across both floors. Where the garden depth rules out PD, a full planning application is the standard route. Stockton, Middlesbrough, Redcar & Cleveland, and Hartlepool councils all approve two storey rear extensions where the design is appropriate.
Side Two Storey Extension
Do I need planning permission for a Side two storey extension in Teesside?
Planning permission always required Two storey side extensions are specifically excluded from Permitted Development rights in England. A full householder planning application must always be submitted — regardless of size, property type, or location
This is the most common misunderstanding on two storey work. Unlike two storey rear extensions — which can sometimes qualify for PD if the garden is deep enough — two storey side extensions have no PD route at all. The planning application is assessed by your local council against their Local Plan policies. Stockton Borough Council, Middlesbrough Council, and Redcar & Cleveland Council all assess these against design quality, scale, and impact on the street scene.
The most scrutinised issue is the “terracing effect” — where a two storey side extension on a semi-detached house makes the pair of properties look like a terrace. Councils assess this carefully but don’t automatically refuse it. We design two storey side extensions to be subservient to the original house, which typically results in first-time approval.
Garage Conversion
Do I need planning permission for a Garage Conversion in Teesside?
Most garage conversions
Planning permission not required
Internal alterations to an integral or attached garage are PD. Building regulations approval is always required regardless.
New-build estates — check first
May need a formal application
Many new-build properties have a planning condition requiring the garage to remain as parking. Converting without removing this first is a planning enforcement breach.
Critical for Ingleby Barwick, Wynyard, Coulby Newham, Hartburn, and other new-build estates in Stockton and Middlesbrough: Many properties built from the 1990s onwards have a planning condition requiring the garage to be retained as vehicle parking. We check for these conditions on every garage project before any drawings are started — completely free. This takes minutes and could save you from a serious enforcement problem
The measurement is taken from the original rear wall of the house — not A garage conversion is one of the most cost-effective home improvements available — typically £8,000–£20,000 to convert versus £25,000+ to build an equivalent extension. Even without a planning application, building regulations approval is always required — the garage must be upgraded to meet thermal, structural, fire, and ventilation standards before it can be used as a habitable room. A completion certificate from building control is essential for selling or remortgaging.
Loft Conversion
Do I need planning permission for a Loft Conversion in Teesside?
Most loft conversions
Permitted Development — no planning needed
Within the volume limit (40m³ terraced, 50m³ semi/detached), rear/side dormers only, not higher than existing ridge. An LDC is strongly recommended.
Front dormers & over-limit conversions
Planning permission required
Any dormer on the front roof slope facing the road is never PD. Conversions exceeding the volume limits also require full planning permission.
| Conversion type | Planning needed? | Notes |
|---|---|---|
| Velux / rooflight only | Usually no | Simplest option — rooflights within the existing roof slope. Almost always PD. |
| Rear dormer | Usually no | Most popular type. PD if within volume limit and doesn’t project in front of roof slope. |
| Hip-to-gable | Usually no | Converts sloped end to vertical gable. PD subject to volume limits. |
| Front dormer | Always yes | Any dormer on the street-facing roof slope is never PD. Always requires planning. |
| Mansard conversion | Usually yes | Major change to roof form. Typically requires planning permission. |
| Conservation area | Usually yes | Roof alterations in conservation areas are usually not PD — check with us. |
Local council guides
Find the specific rules for your council
National PD rules are the same everywhere in England — but each council has its own Local Plan policies, conservation areas, and local validation requirements that affect how planning applications are assessed and what the decision is likely to be.
Middlesbrough Council
Includes the no-free-go policy change (Dec 2023), Linthorpe Article 4 Direction, and current fee structure.Read the guide →
Stockton Borough Council
Covers the Householder Extensions SPD, Ingleby Barwick parking conditions, Yarm and Norton conservation areas.Read the guide →
Redcar & Cleveland Council
Covers policies SD3 and SD4, free pre-application advice service, Saltburn, Staithes, and Guisborough conservation areas.Read the guide →
Hartlepool Borough Council
Covers updated validation requirements (Aug 2025), Hartlepool Headland conservation area, and HMO Article 4.Read the guide →
North Yorkshire (Hambleton)
Covers the Hambleton District Council merger (April 2023), North York Moors National Park boundary, and market town conservation areas.Read the guide →
Not sure which council covers you?
Call us on 07468 455796 and we’ll confirm your local planning authority and what applies to your property — free of charge.Call now →
Important Information
The information provided in this Permitted Development Tracker is intended as a general guide only and is based on the current Planning (General Permitted Development) (England) Order, together with our interpretation of the information you provide.
Every property is different. Existing extensions, planning conditions, Article 4 Directions, conservation areas, listed building status, previous planning permissions, and other site-specific constraints can all affect whether Permitted Development rights apply.
This guide does not constitute planning, legal, or professional advice and should not be relied upon as confirmation that planning permission is not required. The final interpretation of planning legislation rests with the relevant Local Planning Authority.
We strongly recommend obtaining a Lawful Development Certificate (LDC) before carrying out any work under Permitted Development. An LDC provides formal confirmation from the council that the proposed development is lawful and is often requested by solicitors, mortgage lenders, and future purchasers.
Whilst every effort has been made to ensure the accuracy of this information, Architectural Planning Drawings Ltd accepts no liability for any loss, costs, or damages arising from reliance on this guide.
If you are unsure, please contact us for a free assessment before commencing any work.
FAQ
Common questions about extension drawings
Do I need planning permission for a rear single storey extension in Teesside?
Most rear single storey extensions in Teesside qualify for Permitted Development and do not require a full planning application. Under standard Permitted Development Rights, a rear extension can extend up to 3 metres from the original rear wall on a semi-detached or terraced house, or 4 metres on a detached house. The Larger Home Extension Scheme allows extensions up to 6 or 8 metres respectively, subject to a prior approval process with the council and neighbour notification. Exceptions include properties in conservation areas, Article 4 direction areas, and listed buildings. We confirm your property’s status during your free initial consultation.
How long does it take to get planning permission for a rear extension?
We typically deliver your planning drawings within 10–14 working days of completing the site survey. Once submitted to the council, the statutory decision period is 8 weeks for a householder planning application. In practice, Middlesbrough Council and Stockton Borough Council often determine straightforward rear extension applications within 6–8 weeks. From your first call to us to receiving a planning decision, most clients are looking at approximately 10–12 weeks in total.
How much do architectural drawings cost for a rear extension in Middlesbrough?
Our drawings for a rear single storey extension start from £750 as a fixed price. This covers all drawings required for a planning application — site location plan, block plan, existing and proposed floor plans, and all elevations. The final price is confirmed during your free consultation and depends on the size and complexity of your property. There are no hourly rates or unexpected additions. Building regulation drawings, if required for your builder, are quoted separately.
What is the difference between planning drawings and building regulation drawings?
Planning drawings are submitted to the council to obtain planning permission — they show what you propose to build and how it will look, but don’t include structural or technical construction details. Building regulation drawings (also called building control drawings) are a separate set of more detailed technical drawings used to gain Building Regulations approval, which is required before your builder starts work. Building regulation drawings include structural specifications, insulation details, and construction methods. We can provide both — ask us for a combined quote.
Do I need a Lawful Development Certificate if my extension is Permitted Development?
A Lawful Development Certificate (LDC) is not legally required if your extension is within Permitted Development limits — you can build without one. However, an LDC is strongly recommended. It provides a formal record that your extension was lawful, which protects you when selling your home (solicitors and buyers routinely request LDCs) and means you can’t be challenged about the extension’s legality in the future. We can advise on whether an LDC is worth obtaining for your specific project.
Can a rear single storey extension add value to my home in Teesside?
A well-designed rear single storey extension typically adds to a property’s value. Extensions that create open-plan kitchen-diner spaces are particularly popular with buyers in Teesside and are consistently highlighted by local estate agents as adding significant market appeal — making it one of the best-value home improvements available.
Do you cover my area? Which parts of Teesside do you serve?
We cover the whole of Teesside and the surrounding area, including Middlesbrough, Stockton-on-Tees, Redcar, Hartlepool, Thornaby, Billingham, Yarm, Guisborough, Saltburn, Ingleby Barwick, Marton, Acklam, Nunthorpe, Norton, and Darlington. We also work on projects in North Yorkshire and County Durham on request. If you’re unsure whether we cover your area, just call us on 07468455796
Extension drawings across Teesside
We provide architectural drawings for rear single storey extensions across all of the following areas. Don’t see yours? Call us — we cover more than this list.
Middlesbrough Stockton-on-Tees Redcar Hartlepool Thornaby Billingham Yarm Guisborough Saltburn-by-the-Sea Ingleby Barwick Marton Acklam Nunthorpe Norton Darlington Skelton Loftus Eston North Yorkshire County Durham
📍
Site Location Plan
OS-based 1:1250 scale plan showing your property in its local context. Required for every planning application.
📐
Existing Floor Plans
Accurate measured drawings of your existing ground floor layout, created from our site survey or your supplied measurements.
🏠
Existing Elevations
External elevation drawings of your property as it currently stands — required to show what is changing.
📋
Planning Application Support
Guidance on submitting your application to the council, including advice on application fees and what to include in your submission.
🗺️
Block Plan
1:500 scale plan showing the site boundaries, the existing building footprint, and the proposed extension footprint.
✏️
Proposed Floor Plans
Detailed floor plans showing the rear extension design, internal layout, dimensions, and connection to the existing property.
🏗️
Proposed Elevations
External elevation drawings showing the finished appearance of the rear extension, including materials notes where required.
🔄
One Round of Revisions
If the council or your builder requests minor amendments to the drawings, one revision round is included in your fixed price.
