Kirkwood is a leading provider of house extensions in Leigh-on-Sea.
Kirkwood designs and builds house extensions in Leigh-on-Sea, from single-storey kitchen extensions starting at £35,000 to double-storey projects starting at around £65,000. We handle the architectural design, the planning application through Southend-on-Sea City Council and the structural engineering, from conceptualisation to completion. Leigh-on-Sea, known for its coastal beauty, thriving arts scene, and vibrant community, offers an idyllic location for your house extension project.
Planning Permission for Extensions in Leigh-on-Sea
Leigh-on-Sea falls under Southend-on-Sea City Council, which is the planning authority for every extension application in the area. Whether you need an application at all depends on the property. Many homes near the seafront or inside a conservation area may not have permitted development rights, so it is worth checking the position for your street before you spend money on drawings.
Away from those restrictions, a single-storey rear extension of up to 3m on a semi-detached or terraced house, or up to 4m on a detached house, typically does not need planning permission. Larger or more complex schemes usually do. We check which route applies to your home and, where an application is needed, prepare it and submit it to Southend-on-Sea City Council for you. Our planning permission page explains the process in more detail.
Our Services
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Take a look at our recent work
A collection of homes Kirkwood have improved and extended in Essex
Need an all in one ‘design and build solution’?
House Extensions Designed and Built For You. This is what you get from our Home Extension Team:
- Approved by UK’s Leading Building Inspectors
- Expert Tradesman
- Architectural Plans & Submission Included
- Your Own Project Manager
- 10 Year Guarantee
House Extension Costs in Leigh-on-Sea
Cost is the first question most homeowners ask. The ranges below are the figures we publish in our cost guides, so you can see roughly where a project sits before you get in touch. Plans, drawings and professional fees are priced separately from the build.
Project type | Typical range | Notes |
Single-storey rear extension | £26,000–£70,000 | From a 3m × 3m to a 6m × 4m extension |
Rear kitchen extension | £50,000–£80,000 or more | Kitchen diner with bifolding doors and a pitched roof |
Double-storey extension | From around £65,000 | Depends on size and layout |
Loft conversion | Velux from £25,000; rear dormer £45,000–£70,000 | Higher for hip-to-gable and Mansard conversions |
Local example: Marine Parade, Leigh on Sea | £46,795 + VAT | 4m × 5.5m extension |
Your own figure will depend on size, roof type, glazing and finish. For a detailed breakdown, see our guide to house extension costs, or our loft conversion costs in Essex.
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Get in touch with a member of our friendly team to find out more about our highly competitive prices. You can also get in touch should you have any questions about our range, prices, or any of our services. We look forward to hearing from you.
Frequently Asked Questions
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Do I need planning permission for a house extension in Leigh-on-Sea?
Often not for a single-storey rear extension. Up to 3m on a semi-detached or terraced house, or 4m on a detached house, typically falls under permitted development. Properties near the seafront or in conservation areas may have restricted rights, and larger projects usually need a full application, so check your own property first.
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Who is the planning authority for Leigh-on-Sea?
Southend-on-Sea City Council. Any planning application for an extension in Leigh-on-Sea is made to the council, and its decision applies to the whole of the area.
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How much does a house extension cost in Leigh-on-Sea?
A single-storey rear extension typically costs between £26,000 and £70,000, depending on size, and a rear kitchen extension with bifolding doors and a pitched roof can run from £50,000 to £80,000 or more. Double-storey projects start from around £65,000. The table above and our house extension costs guide give the details.
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How long does a house extension take in Leigh-on-Sea?
For a single-storey rear extension, design takes around 2 weeks, the planning application 6–8 weeks, structural engineering and Building Regulations 2–3 weeks, and construction around 10–14 weeks. That adds up to roughly 20–28 weeks from the first design meeting to a finished build. Our guide on how long a house extension takes covers each stage.
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Can Kirkwood handle planning permission for my Leigh-on-Sea extension?
Yes. We check whether your extension needs planning permission, prepare the application and submit it to Southend-on-Sea City Council on your behalf. We also provide the architectural design and the structural engineering, so the application and the technical drawings stay consistent. The first step is a free Discovery Call.