0141 255 062407548 285045 Mon–Fri 8:00–17:00 HomeAbout Services Service Areas Our WorkContact0141 255 0624Contact Us - Home - Our Services - Steel Frame Extensions Steel Frame Extensions # Steel Frame Extensionsin Glasgow, Built Fasterwith Less Disruption Add the kitchen, bedroom or living space you need on a precision steel frame that closes in quickly, keeps its shape and is designed, approved and finished by one team. Contact Us 0141 255 0624 Get in touch, response the same working day. - £5m Public Liability Insured up to £5 million - Contact Us Response the same working day - Same Working Day Response to every enquiry - Planning Handled Planning & building control - Guarantee Details available on request Service overview ## What Steel Frame ExtensionsMeans for You Part of our steel frame services from ISF Systems Limited, based in Glasgow. ### What it is A steel frame extension uses a light gauge steel frame in place of timber or block to form the walls and roof of the new space. The frame is made to exact size, assembled on your foundations, then insulated, clad and finished inside to match your home. From the inside it looks and feels like any other room. ### Who it's for Steel frame extensions suit families who need more space without moving, homeowners who want the build over quickly because they are living on site, and anyone with limited access where lighter materials are easier to bring in. ### When you need it Consider a steel frame when you need a single or two-storey rear, side or wrap-around extension, when you want to open up the back of the house, or when you want to reduce weeks of wet-trade work next to a lived-in home. ### Why professional help matters An extension ties into your existing structure, drainage, roof and heating. Getting those junctions, foundations and building regulations right is what separates a warm, dry room from a problem. We design in-house, handle planning and building control, and coordinate every trade. Our work ## Steel Frame Extensions Projects The cost of getting it wrong ## What Happens WhenIt's Left or Done Badly A badly planned extension costs more than the build. It costs months of disruption and years of small defects. ### Months of mess Traditional builds leave a household living beside an open site through wet weather, with dust, noise and restricted access to the garden. ### Cracks at the join Shrinkage and settlement where new meets old can show as cracks in plaster and render in the first year. ### Cold, damp rooms Poor insulation and cold bridging lead to condensation and a room that never gets comfortable in winter. ### Approval problems Building without the correct planning or building control approval can cause issues when you come to sell. ### Common mistakes we see - Getting a build price before the design and approvals are sorted. - Underestimating the tie-in to the existing roof and walls. - Leaving heating and electrics until the walls are boarded. - Choosing on price alone with no single point of responsibility. Our process ## Five Clear StepsFrom Survey to Handover - 01 ### Step 1: Home Survey We measure up, look at the existing structure and discuss how you want to use the new space. - 02 ### Step 2: Design Plans drawn in-house, with structural engineering for openings and tie-ins. - 03 ### Step 3: Planning & Building Control Applications submitted and managed on your behalf. - 04 ### Step 4: Frame & Weatherproofing Foundations prepared, steel frame erected, and the extension made weathertight before breaking through. - 05 ### Step 5: Fit-Out & Handover Electrics, plastering, joinery and finishes, building control sign-off, and handover. Guarantee details available on request. Our core team is backed by a trusted network of specialist subcontractors, so every project has the right trade on site at the right time. Benefits ## What You GetWhen ISF Builds It ### Less Time Living on a Site A made-to-size frame closes in quickly, shortening the noisiest, messiest part of the build. ### Walls That Stay Straight Steel does not shrink as it dries, reducing the cracking common at new-to-old junctions. ### Warm and Quiet Insulation is designed around the frame to meet current thermal regulations. ### Paperwork Taken Off You Planning and building control handled by us from application to sign-off. ### Free Next Day Delivery Frame materials are delivered free the next day, keeping the programme moving. ### Lighter on Foundations A lighter structure can simplify groundworks where conditions suit. In detail ## Materials, Methodsand Applications Steel frame works for most extension types. Here is how the method adapts to different homes. ### Single-Storey Rear and Side Extensions The most common project: open-plan kitchens, family rooms and utility spaces. The steel frame allows wide openings for bi-fold or sliding doors with engineered support. ### Two-Storey Extensions Adding a bedroom or bathroom above a ground floor room. Floor joists and walls are engineered as one frame, and the roof ties into your existing structure. ### Wrap-Around and Kitchen Extensions Combining side-return and rear extensions to transform the back of the house. Precise framing keeps long runs of glazing and rooflights true. ### Materials and Finish C.E. approved galvanised steel frame, made from 70% recycled steel, then insulation, membranes, external cladding or render and internal plasterboard. Finished rooms look no different from a traditional build. ### Coordinating With Your Existing Home We plan the break-through, drainage, heating extension and electrical tie-in so disruption to the rest of the house is kept to a short, planned window. Planning your project ## What to KnowBefore You Start ### What to Have Ready for Your Survey You don't need drawings to get started. It helps to know roughly what you want the steel frame extensions project to achieve, any deadline that matters to you, and whether you already have plans, planning consent or a budget in mind. We'll take it from there, measure up and advise on the best approach for your site. ### How Your Quote Is Built Your quote is based on the survey and the design, not a generic price list. It sets out the scope, what is included, what you may choose to supply yourself and a programme from approvals to handover, so you can compare it properly and budget with confidence. ### Steel Frame vs Traditional Construction Traditional masonry relies on wet trades that stop in bad weather and need time to dry. A light gauge steel frame arrives made to size, goes up straight and square, and lets the building close in sooner. It is lighter on foundations, does not rot, shrink or warp, and our frames are made from 70% recycled steel. ### Planning and Building Control Whether your project needs full planning permission, falls under permitted development or only needs building control approval depends on its size, use and location. We check at survey stage and handle the applications and sign-off on your behalf. FAQ ## Steel Frame ExtensionsQuestions Answered Not covered here? Call 0141 255 0624 or send an enquiry. ### How much does a steel frame extension cost in Glasgow? It depends on size, the number of storeys, glazing and finishes. We quote each extension after a site survey, and aim to respond the same working day. ### How long does a steel frame extension take? Steel frame is quicker to close in than block because sections arrive made to size. Your quote includes a programme for your extension from approvals to handover. ### Do I need planning permission for an extension? Some extensions fall under permitted development and some need full planning. We check at survey stage and handle whichever applications are needed, plus building control. ### Can I stay in the house during the build? Most clients do. The extension is made weathertight before we open into the house, which keeps the disruptive part short. ### Will it look different from a traditional extension? No. Once clad, rendered and plastered, a steel frame extension looks and feels like any other room. ### How do I get started? Fill in the enquiry form or call us to talk through your project. We aim to respond the same working day. ### What guarantee do you offer? Guarantee details are available on request. Ask at survey stage and we'll set out exactly what is covered for your project. ### Are you insured? Yes. We hold public liability insurance up to £5 million. ### Do you offer an emergency service? We are a planned construction contractor rather than an emergency call-out service. Our office is open Monday to Friday, 8:00 to 17:00. Call 0141 255 0624 and we'll respond the same working day. ### Do you work outside Glasgow? Yes. We're based in Glasgow and work UK-wide, including Northern Ireland. Areas we cover include Lanarkshire, Edinburgh, Stirling, Aberdeen, Newcastle upon Tyne, Manchester, Cardiff and Belfast. ## Related Services - Light Gauge Steel Frame (LGSF) Construction - Full Fit Outs - Garden Rooms, Garden Offices & Home Gyms - Trade Services (Electrical, Roofing, Joinery & Plastering) - ISF Systems home ## Steel Frame Extensions Near You - Glasgow - Lanarkshire - Edinburgh - Stirling - Aberdeen - Newcastle upon Tyne - Manchester - Cardiff - Belfast Get in touch ## More Space at Home,Without Months of Mess Get in touch. We'll design it, handle planning and building control, and quote the finished extension. £5m public liability Response the same working day Contact Us 0141 255 0624 Smarter Framing. Stronger Buildings. Light gauge steel frame buildings, designed and built by one team. Based in Glasgow, working UK-wide including Northern Ireland. £5 million public liability insurance. ### Steel Frame Services - Light Gauge Steel Frame (LGSF) Construction - Full Turnkey Steel Frame Buildings - Steel Frame Extensions - Commercial Steel Frame Buildings & Units - Steel Frame Offices - Steel Frame Classrooms - Garden Rooms, Garden Offices & Home Gyms - Full Fit Outs - Trade Services (Electrical, Roofing, Joinery & Plastering) ### Areas Covered - Steel Frame Buildings Glasgow - Steel Frame Buildings Lanarkshire - Steel Frame Buildings Edinburgh - Steel Frame Buildings Stirling - Steel Frame Buildings Aberdeen - Steel Frame Buildings Newcastle upon Tyne - Steel Frame Buildings Manchester - Steel Frame Buildings Cardiff - Steel Frame Buildings Belfast ### Contact - 0141 255 0624 - 07548 285045 - Mark@isfsystems.co.uk - 48 West George Street, Glasgow, G2 1BP ### Opening Hours - Monday – Friday: 8:00 – 17:00 - Saturday – Sunday: Closed © 2026 ISF Systems Limited. 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