--- title: "Home Extensions Tredegar & South Wales | Gwent Roofing" description: "Quality home extensions in Tredegar & South Wales. Single storey, double storey, kitchen, and rear extensions. 25+ years building experience. Free estimates. 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Single storey, double storey, kitchen, and rear extensions. 25+ years building experience. Free estimates. Fully insured.", "url": "https://gwentroofingandbuildings.com/services/extensions", "provider": { "@type": "RoofingContractor", "name": "Gwent Roofing and Building Maintenance", "telephone": "+447949926887", "address": { "@type": "PostalAddress", "streetAddress": "23 Ashvale", "addressLocality": "Tredegar", "addressRegion": "Blaenau Gwent", "postalCode": "NP22 4AG", "addressCountry": "GB" } }, "areaServed": [ "Tredegar", "Ebbw Vale", "Merthyr Tydfil", "Abertillery", "Aberdare", "Blackwood", "Bargoed", "Blaenavon", "Crickhowell" ] }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "How much does a home extension cost?", "acceptedAnswer": { "@type": "Answer", "text": "Single-storey extensions typically cost £1,200 to £2,000 per square metre depending on specification. A 4m x 5m rear extension would be approximately £24,000 to £40,000. We provide free, fixed-price estimates." } }, { "@type": "Question", "name": "How long does an extension take to build?", "acceptedAnswer": { "@type": "Answer", "text": "A single-storey extension typically takes 8 to 12 weeks from foundations to completion. Double-storey extensions take 12 to 16 weeks. We provide a clear timeline at agreement." } }, { "@type": "Question", "name": "Do I need planning permission for an extension?", "acceptedAnswer": { "@type": "Answer", "text": "Many single-storey rear extensions fall within permitted development and do not need planning permission. We assess this at the consultation stage and handle any applications required." } }, { "@type": "Question", "name": "Do you handle the architectural plans?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. We work with experienced architectural designers who produce plans for planning and building regulations. This is included in our service." } }, { "@type": "Question", "name": "Can I stay in my home during the build?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Most homeowners stay in their property throughout the build. We plan the work to maintain access, water, and heating at all times." } }, { "@type": "Question", "name": "Do you do the electrics and plumbing?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. We manage all trades including electrical work (Part P certified), plumbing, heating, plastering, and decoration." } }, { "@type": "Question", "name": "What about Party Wall agreements?", "acceptedAnswer": { "@type": "Answer", "text": "If your extension is built on or close to the boundary with a neighbour, a Party Wall Award may be required. We advise you on this and can recommend a surveyor." } }, { "@type": "Question", "name": "Will an extension add value to my home?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Estate agents confirm that a well-built extension typically adds 10-20% to property value, often exceeding the build cost." } }, { "@type": "Question", "name": "Can you build an extension with a flat roof?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. We install EPDM and GRP flat roofs on extensions. These carry a 50+ year life expectancy and can include lantern lights and skylights." } }, { "@type": "Question", "name": "What areas do you build extensions in?", "acceptedAnswer": { "@type": "Answer", "text": "We build across Tredegar, Ebbw Vale, Merthyr Tydfil, Abertillery, Aberdare, Blackwood, Bargoed, Blaenavon, Crickhowell, and surrounding valleys." } } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://gwentroofingandbuildings.com/" }, { "@type": "ListItem", "position": 2, "name": "Services", "item": "https://gwentroofingandbuildings.com/services" }, { "@type": "ListItem", "position": 3, "name": "Home Extensions That Add" } ] } ] --- [![Gwent Roofing and Building Maintenance — trusted roofers in South Wales](/images/logo.png)](/) [Home](/) [Services](/services) [Areas](/areas)[About](/about)[Our Work](/our-work)[Reviews](/reviews)[Contact](/contact) [07949 926887](tel:+447949926887)Free Quote 1. [Home](/) 2. [Services](/services) 3. Home Extensions That Add # Home Extensions That Add Space, Value and Light to Your Property Moving house is expensive and stressful. A well-designed extension gives you the space you need — a bigger kitchen, an extra bedroom, a home office — without leaving the neighbourhood you love. We manage every stage from planning to handover, so you get the result you want without the headache. [Request a Free Estimate](/contact) [Call 07949 926887](tel:+447949926887) ★ Dozens of extensions completed across Tredegar, Ebbw Vale, and Merthyr Tydfil 25+ Years Building Experience Planning to Completion Fully Insured Clear Timeline Guaranteed Free Design Consultation ## What This Service Involves An extension is one of the most impactful improvements you can make to your home. It adds usable living space, increases natural light, transforms how your family uses the ground floor, and adds significant value to your property — often more than the cost of the build itself. Gwent Roofing and Building Maintenance builds single-storey and double-storey extensions across Tredegar, Ebbw Vale, Merthyr Tydfil, Abertillery, Aberdare, Blackwood, and the wider South Wales valleys. We handle everything: foundations, structural steelwork, blockwork, roofing, windows, electrics, plumbing, plastering, and finish. We work closely with homeowners to understand exactly what they want from their extension — the extra space, the light, the connection to the garden, the flow between rooms. We then deliver a build that matches your vision, stays within budget, and is completed on time. Every extension project begins with a free consultation at your property. We discuss your ideas, assess feasibility, advise on planning requirements, and provide a clear, fixed-price estimate. There are no surprises with Gwent Roofing — just straight-talking advice and quality workmanship from start to finish. ## What Goes Wrong When Extensions Are Poorly Managed The most common extension horror stories involve poor communication, unclear pricing, and builders who disappear mid-project. Homeowners are left with half-built structures, unexpected bills, and no clear timeline for completion. This happens when you choose a builder on price alone, without checking their track record. Structural problems also arise when builders skip proper foundations or undersize steel beams. An extension that settles, cracks, or shows signs of movement within the first few years is a costly disaster. Building control inspections are mandatory at key stages — but some builders try to skip them, leaving you with an uncertified structure. Another common issue is damp. Extensions that are not properly damp-proofed, ventilated, or connected to the existing building create cold spots, condensation, and mould problems. The junction between old and new construction is particularly vulnerable and must be detailed correctly. Finally, poor thermal performance is a frequent complaint. Extensions built to minimum standards rather than best practice feel cold in winter and require excessive heating. We specify insulation that exceeds Building Regulations, ensuring your new space is comfortable year-round. ## How We Work 1 ### Free Consultation We visit your property, discuss your requirements, assess the site, and advise on design options, planning requirements, and budget. 2 ### Design & Planning We work with architectural designers to produce plans. We handle planning applications and building regulation submissions on your behalf. 3 ### Fixed-Price Agreement You receive a detailed, itemised quote with a fixed price. The specification covers every material, finish, and fixture. 4 ### Build Phase Foundations, structure, roof, external envelope, first fix, second fix, and finishes — all managed by our experienced site team. 5 ### Handover & Sign-Off Building control final inspection, snagging list completed, and your new extension handed over ready to use. ## Why Homeowners Choose Us ### Adds Property Value A well-built extension typically adds more value to your home than it costs to build — making it a sound investment. ### Single Point of Contact One team manages everything — structure, roofing, electrics, plumbing, and plastering. No coordinating multiple trades yourself. ### Fixed-Price Confidence Our price is fixed at agreement. We do not issue variation orders or add surprise costs during the build. ### Building Regulations Compliant Every stage is inspected by building control. You receive full completion certificates for your records and future sale. ### Exceeds Thermal Standards We insulate beyond minimum requirements so your extension is warm, efficient, and comfortable year-round. ### Clean, Managed Site We maintain a tidy, safe site throughout the build. Access is maintained and disruption is minimised. ## Extension Types, Construction & Details Single-storey rear extensions are the most common type we build. They typically extend the kitchen, create an open-plan kitchen-diner, or add a living room that opens onto the garden. Under permitted development rules, many single-storey rear extensions up to 4 metres (detached) or 3 metres (semi/terraced) do not require planning permission. Double-storey extensions add both ground floor and first floor space — typically a larger kitchen below and a bedroom or bathroom above. These almost always require planning permission and structural engineering. We manage the entire process including structural calculations and planning submissions. Side return extensions are popular on terraced and semi-detached properties where a narrow alley runs along the side of the house. Infilling this space creates a significantly wider kitchen or dining area. Side return extensions often fall within permitted development and can be completed quickly. Wrap-around extensions combine a rear and side return extension into an L-shaped or U-shaped structure that maximises floor space. These are more complex builds that require careful structural design but deliver transformative results. Construction methods include traditional masonry (blockwork cavity walls), timber frame, and structural insulated panels (SIPs). We typically build with masonry for its durability and thermal mass, but we are experienced in all methods and will recommend the best approach for your project. Roof options for extensions include flat roofs (EPDM or GRP), pitched roofs to match the existing property, and combination designs. We install lantern lights, Velux windows, and glazed roof panels to maximise natural light in your new space. ## Frequently Asked Questions ### How much does a home extension cost? ### How long does an extension take to build? ### Do I need planning permission for an extension? ### Do you handle the architectural plans? ### Can I stay in my home during the build? ### Do you do the electrics and plumbing? ### What about Party Wall agreements? ### Will an extension add value to my home? ### Can you build an extension with a flat roof? ### What areas do you build extensions in? ## Related Services [Loft Conversions](/services/loft-conversions) [New Builds](/services/new-builds) [Flat Roofs](/services/flat-roofs) [Roofing](/services/roofing) [Guttering](/services/guttering) [← Back to Home](/)[Contact Us](/contact)[Customer Reviews](/reviews)[Our Work](/our-work) 5.0 Rated on Google · 3,000+ jobs completed ## Get Your Free Estimate Today No obligation. No hidden costs. Just honest advice from a local tradesman with 25+ years of experience. [Get Your Free Estimate](/contact)[07949 926887](tel:+447949926887) Reply within 1 hour · Free & no obligation · 24/7 emergency callouts [![Gwent Roofing and Building Maintenance — trusted roofer in Tredegar and South Wales](/images/logo.png)](/) Professional [roofing](/services/roofing) and [building services](/services/extensions) across South Wales. 25+ years of trusted craftsmanship serving [Tredegar](/areas/tredegar), [Ebbw Vale](/areas/ebbw-vale), [Merthyr Tydfil](/areas/merthyr-tydfil), and the valleys. 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