House Extensions in Portsmouth — Get Quotes
Need more space without moving? A home extension could be the answer. Quote2 connects Portsmouth homeowners with experienced builders and structural engineers who specialise in rear extensions, side returns, and single or double-storey additions. Post your project for free and get detailed quotes from local specialists.
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How It Works
Post your extension project
Describe the type of extension you want — rear, side, single or double storey — and the rough size if you know it. Mention any planning considerations or design ideas you already have.
Receive responses from builders
Experienced extension builders in Portsmouth will review your project and respond with their approach, past examples, and indicative pricing. Some may offer a free initial site visit.
Compare and appoint
Review each builder's experience with extensions in Hampshire, check their reviews, and choose who to appoint. You're in complete control — take your time before committing.
Why Portsmouth Homeowners Use Quote2
Free to post
Posting a job costs nothing. Tradespeople pay a small fee to contact you — keeping the platform fair and spam-free.
Vetted tradespeople
Every tradesperson on Quote2 is reviewed by real homeowners. You can read feedback from other Portsmouth residents before you decide.
Direct contact
Message tradespeople directly — no call centres, no pushy salespeople, and no being passed around.
Max 3 per job
Each job is shared with a maximum of 3 tradespeople. Genuine competition without being overwhelmed by dozens of calls.
House Extensions in Portsmouth — Get Quotes — Covered by Quote2
Home extensions are one of the most popular ways for homeowners in Portsmouth and Hampshire to add space and value without the cost and disruption of moving. Whether you're looking to extend your kitchen into the garden, add a side return, or build a double-storey addition, the right builder can guide you from planning through to completion. Quote2 connects Portsmouth homeowners with reputable extension builders across Portsmouth and nearby areas including Southsea and Gosport. Many single-storey rear extensions fall under permitted development, but a specialist builder can confirm what's possible for your property and whether planning permission or building regulations approval will be needed. Post your project for free and let qualified local builders respond with their experience, approach, and pricing.
Frequently Asked Questions
Do I need planning permission for a house extension in Portsmouth?
Many single-storey rear extensions fall under permitted development rights and don't require a planning application. Key limits include a maximum rear projection of 3m for terraced/semi-detached or 4m for detached homes (or up to 6m/8m under the Neighbour Consultation Scheme). Properties in conservation areas or those that have used up permitted development rights will need formal planning permission. A local builder in Portsmouth can advise.
How much does a house extension cost?
A single-storey rear extension in Portsmouth typically costs £1,500–£2,500 per m², so a 20m² extension might cost £30,000–£50,000 fully finished. Double-storey extensions cost more per m² due to additional structural requirements. Getting multiple quotes through Quote2 helps you understand the local market.
How long does a house extension take to build?
A standard single-storey extension takes around 12–16 weeks from breaking ground to completion. Planning (if required) adds several months to the programme. Double-storey or more complex projects take longer. Your builder will provide a detailed programme at the outset.
Do I need an architect for a house extension?
Not always — for straightforward extensions, an experienced builder can often handle design and building regulations drawings directly. For more complex projects or planning applications, an architect or architectural designer is worth the investment. Some builders on Quote2 work with architects or can recommend one in Portsmouth.
Ready to get started in Portsmouth?
Join thousands of Hampshire homeowners who've used Quote2 to find great local tradespeople at fair prices.
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