Side Extension Planning Permission Newcastle
Do You Need Planning Permission for a Side Extension in Newcastle?
Many single-storey side extensions in Newcastle can be built under permitted development (PD) without a planning application. But the limits on width, height, position and planning history are strict, and side extensions lose PD rights entirely in conservation areas.
What Counts as a Side Extension Under Permitted Development
Under Class A of the General Permitted Development Order, a side extension is normally allowed without planning permission if it meets all of these conditions:
Single storey only
No more than 4 metres high
No wider than half the width of the original house
Eaves no higher than 3 metres where any part is within 2 metres of a boundary
External materials of a similar appearance to the existing house
Not extending beyond the front (principal) elevation, or beyond a side wall that faces a road
No balcony, veranda or raised platform
Extensions and outbuildings together covering no more than 50% of the land around the original house
"Original house" means the property as first built, or as it stood on 1 July 1948. Earlier extensions, including those by previous owners, count against your allowance. A rear extension, a side extension or a loft conversion already on the house can all affect what's left. Planning conditions from earlier approvals and Article 4 Directions can also remove PD rights, so check the property's planning history before you design anything.
For the wider rules, see our guide to permitted development vs planning permission.
When You Need Full Planning Permission for a Side Extension in Newcastle
You'll need a householder planning application if the extension breaks any condition above. Typical cases:
Two-storey side extensions
Extensions wider than half the original house or higher than 4 metres
Corner plots where a side elevation fronts a road (this needs careful checking, but a corner plot doesn't automatically mean planning permission is required)
Properties where PD rights have been removed by an Article 4 Direction or an earlier planning condition
Conservation Areas and Listed Buildings
Side extensions are not permitted development on designated land, which includes conservation areas. In a Newcastle conservation area, any side extension needs a householder planning application, however small. Check your address against Newcastle City Council's conservation area maps before you plan anything.
Listed buildings are a separate matter. Listed Building Consent may be needed for any work affecting the building's character, whatever the planning position.
Lawful Development Certificate: Worth It for PD Extensions
If your extension qualifies as permitted development, you can still apply for a Lawful Development Certificate (LDC). It's formal written confirmation from the council that the work is lawful, and a buyer's solicitor or mortgage lender may ask for it when you sell. Newcastle City Council recommends one where you want that confirmation in writing.
What You'll Pay: Drawings and Council Fees
Either route needs accurate drawings: site location plan, block plan, existing and proposed floor plans and elevations, and roof plans or sections where relevant.
PD route (LDC) | Full planning | |
Use when | Meets all Class A conditions | Breaks PD limits, or conservation area / Article 4 |
Our drawings from | £500 | £1,150 (includes Building Regulations drawings) |
Council fee | £274 (half the householder fee) | £548 (householder fee, from 1 April 2026) |
Drawing turnaround | 5 working days from site visit and deposit | 5 working days from site visit and deposit |
Costs outside the drawing package include Building Control fees, structural engineer calculations and any specialist surveys. For the full picture, see our house extension cost guide for Newcastle.
Planning Permission vs Building Regulations
These are separate processes. Planning covers size, appearance and impact on the area. Building Regulations cover the construction: structure, foundations, insulation, fire safety, drainage, ventilation and energy performance. A side extension that's permitted development still needs Building Regulations approval. If you're also weighing up a rear extension, our rear extension planning guide covers the different limits.
Checklist Before You Build
Single storey, no more than 4 metres high, no wider than half the original house?
Eaves within 3 metres if close to a boundary?
Not extending beyond the front elevation or a road-facing side wall?
Earlier extensions taken into account?
No conservation area, Article 4 Direction, planning condition or listing affecting the property?
Building Regulations approval planned?
If any answer is unclear, settle the planning position before construction starts.
Get Your Side Extension Drawings Sorted
Not sure which route applies? Send us your Newcastle address and a rough idea of what you want to build, and we'll tell you before you commit to anything. Fixed price agreed upfront, site visit included, planning-ready drawings within 5 working days of the site visit and deposit. See our house extension drawings service for what's included.
FAQ
Can I build a side extension without planning permission in Newcastle?Often, yes. A single-storey side extension can be permitted development if it meets every Class A condition and the property's PD rights haven't been removed. Planning history and location decide it, so check before you build.
Can I build a side extension in a Newcastle conservation area without planning permission?No. Permitted development rights don't cover side extensions on designated land, so a householder planning application is required.
Does a side extension need Building Regulations approval?Yes, whether it's permitted development or has full planning permission.
How long does a side extension planning application take?A householder application is normally decided within 8 weeks of validation. Drawing preparation happens before that, and we typically complete it within 5 working days of the site visit and deposit.
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