07863 788018 Mon–Sun: 8am–10:30pmOpen 8am–10:30pm AboutServicesAll ServicesCarpentrySecond Fix CarpentryBathroom FittingExtensionsBrickworkRoofingDeckingFencingHandyman AreasAll AreasCambridgeWisbechPeterboroughKing's LynnSt NeotsHuntingdonMarchChatterisWhittlesey Our WorkReviewsContact07863 788018Get a Free Quote - Home - Services - ExtensionsExtensions · Cambridge & the Fens # House Extensions in Cambridge:More Space.Built Properly. Single and double storey extensions taken from footings to finished rooms by one firm, with fixed-price quotes, staged payments, and the carpentry at the heart of the build done by an NVQ Level 2 qualified carpenter. Get My Free Quote 07863 788018 Free site visits across Cambridgeshire · £5m public liability cover · 5.0 on Google Free Site Visit & Quote Fixed price, no obligation Staged Payments 25% deposit, milestones, balance at the end £5m Public Liability Insured on every job NVQ Level 2 Qualified Carpentry & joinery certified Workmanship Guarantee On every job we complete 01The Service ## What Our Extension Service Covers A complete extension service: the groundworks and footings, the structural shell, roofing, the first and second fix carpentry, and the internal finishing that turns new square footage into a room that belongs to the house. Kitchen extensions, rear extensions, side returns, garden rooms and double-storey additions, planned, priced and built by one firm. This service is for homeowners who need more space but don't want to move: a bigger kitchen, an extra bedroom, a proper family room. Around Cambridge, where moving house is expensive and period layouts are often tight, extending is frequently the smarter investment. We also take on extensions for landlords improving a property's layout and value. You need a builder-carpenter rather than a general builder alone when the heart of the project is timber: roof structures, floor joists, studwork, staircases, and the second fix finishing that makes the new space feel like it was always there. That's precisely the work Charlie is NVQ Level 2 qualified in, and it's the work most extension problems trace back to. Every extension starts the same way: a free site visit, an honest conversation about what's possible on your plot and your budget, and one fixed price quoted in stages so you always know where you stand. Brick extension under construction with structural steel beams in Cambridgeshire 02Why It Matters ## What a Badly Built Extension Costs You An extension is the biggest purchase most homeowners make after the house itself, and the least forgiving of poor workmanship. Footings skimped or ground not assessed properly lead to movement and cracking. Roof structures built carelessly leak for years. Timbers installed out of square leave a legacy of bouncing floors, sticking doors and cracking plasterboard that no amount of decoration will hide. The financial exposure is why the payment structure matters as much as the building. Firms that want large sums up front, or vague 'supply and labour' estimates with no fixed figure, are asking you to carry all the risk. Our extensions are quoted at one fixed price, paid in stages, a 25% deposit, further payments at agreed milestones, and the balance on completion, so you only ever pay for work that has actually been done. Then there's the disruption: months of a building site attached to your home. It will never be invisible, but a firm that is punctual, tidy and communicates honestly, the words our reviewers use, unprompted, makes the difference between a stressful ordeal and a manageable project. ### Common Mistakes Homeowners Make - 01Choosing a builder on a vague estimate rather than a fixed-price quote:'estimates' have a habit of growing. - 02Paying large sums up front with no staged payment structure, your money should follow the work, never lead it. - 03Assuming the cheapest quote covers the same scope, groundworks, roofing, first fix and finishing are all places where corners hide. - 04Not asking who does the structural carpentry, the roof, joists and studwork decide how the extension behaves for decades. - 05Starting without checking whether the project needs planning permission or building regs sign-off, we flag this at the site visit. 03How It Works ## How Your Extension Runs 01 ### Free Site Visit Charlie visits, looks at the plot, the existing structure and access, and talks honestly about what's possible for your budget: including planning and building regs considerations. It costs nothing and obliges you to nothing. 02 ### Fixed-Price, Staged Quote You get one clear, fixed price for the project with a staged payment plan: 25% deposit, further payments at agreed milestones, and the balance on completion, so you always know what is due and when. 03 ### Groundworks & Shell Footings, foundations and the structural shell go in, with the timber work, roof structures, joists and studwork, carried out by an NVQ Level 2 qualified carpenter. 04 ### First Fix to Finish Roofing, first fix, plastering coordination and second fix carpentry, doors, skirting, flooring and the finishing that ties the new space into the old house. 05 ### Handover & Guarantee The finished extension is walked through with you, the site is left clean, and the balance is only due on completion. The work is covered by our workmanship guarantee, terms vary by job type, so ask when we quote. 04Why CV Carpentry ## What You Get With CV Carpentry An extension is a serious commitment. Here's how we make sure it's a safe one. ### One Fixed Price, Paid in Stages 25% deposit, milestone payments as work completes, balance at the end. Your money follows the work, and the price we quote is the price you pay. ### Payment Spread Across the Build Extensions are paid in stages: a 25% deposit, further payments at agreed milestones, and the balance on completion, so the cost is spread across the programme rather than falling in one lump. ### Carpentry at the Core Roof structures, joists, studwork and second fix done by an NVQ Level 2 qualified carpenter, the structural heart of your extension in qualified hands. ### One Point of Contact Charlie runs your project from first site visit to final walkthrough. You always know who's on site, what's next and what it costs. ### Public Liability Insured Public liability cover up to £5 million on every project, serious cover for serious work on your home. ### Finished Like It Belongs The second fix is where an extension becomes part of the house, matched skirting, true-hung doors and finishing that makes the new space feel original. 05In Detail ## Extensions in Detail The types of extension we build, what each involves, and how the work is structured across Cambridge and the Fens. ### Single Storey Extensions The most popular way to transform a ground floor: bigger kitchens, open-plan family rooms, utility space and garden rooms. Single storey extensions typically involve groundworks, a structural shell, a flat or pitched roof, and full internal finishing. The carpentry core, roof timbers, joists, studwork and second fix, is done in-house by an NVQ Level 2 qualified carpenter, which is where the long-term quality of the build is decided. ### Double Storey Extensions Adding bedrooms and bathrooms above new living space is the most cost-effective square footage you can add to a house, the groundworks and roof are shared across two floors of new space. Double storey work demands more of the structure and the planning. We'll tell you honestly at the site visit what's realistic on your plot, what the planning picture looks like, and what it will cost, one fixed price, quoted in stages. ### Kitchen & Living Space Extensions The most life-changing extensions are the ones that give a family room to breathe: a kitchen big enough to eat in, a living space that opens to the garden, a ground floor that finally works. These projects combine the full build, groundworks, shell and roof, with the internal finish that makes the space usable. That interior finish is handled in-house through our carpentry and second fix work, doors hung true, skirting matched to the existing house, flooring laid properly, so the new room ties into the old one seamlessly. ### Planning, Regs & Payment Structure Many extensions fall within permitted development, but not all, we'll talk through the planning and building regulations picture at the site visit so you know where you stand before committing to anything. Payment is always staged on extensions: a 25% deposit, further payments at agreed milestones, and the balance on completion. Bank transfer, cash and card accepted. Related Services - Carpentry - Brickwork - Roofing Areas We Cover - Extensions in Cambridge - Extensions in Wisbech - Extensions in Peterborough - Extensions in King's Lynn - Extensions in St Neots - Extensions in Huntingdon Questions ## Extension Questions, Answered Straight ### How much does an extension cost in Cambridge? Every extension is priced individually after a free site visit, the size, the ground, the access and the specification all shape the figure. What we can promise is one fixed price with a staged payment plan: 25% deposit, milestone payments, and the balance on completion. The price we quote is the price you pay. ### Do you offer payment plans? Larger projects such as extensions are paid in stages: a 25% deposit, further payments at agreed milestones, and the balance on completion. Bank transfer, cash and card are all accepted. ### Will my extension need planning permission? Some do, some don't: many extensions fall within permitted development rights, but it depends on your property, your plot and what's been done before. We'll talk through the position honestly at the site visit, before you commit to anything. ### How long does an extension take? A single storey extension typically takes a few months from groundworks to finish; double storey projects take longer. The programme is discussed and agreed at quote stage, and you'll always know what's happening next. ### Who does the structural work: roof, joists and studwork? Charlie does. He's NVQ Level 2 qualified in carpentry and joinery, and the timber core of your extension, roof structures, floor joists, studwork and staircases, is carried out in-house rather than subcontracted out. ### How do payments work during the build? In stages: a 25% deposit, further payments at agreed milestones as work completes, and the balance on completion. You only ever pay for work that's actually been done. Bank transfer, cash and card are all accepted. ### Are you insured for extension work? Yes, public liability insurance cover up to £5 million on every project, and the finished work is backed by our workmanship guarantee. Terms vary by job type, so ask when we quote. ### Which areas do you cover for extensions? We're based in CB3, Cambridge and build extensions across Cambridgeshire and the Fens, including Wisbech, Peterborough, King's Lynn, St Neots, Huntingdon, March, Chatteris and Whittlesey. If your town isn't listed, ask. Get Started ## Get the Space Your Home Is Missing Free site visit, one fixed price with staged payments, and a workmanship guarantee on the finished build. Call Charlie directly, or send the details and we'll come to you. Call 07863 788018Request a Callback Free site visit & fixed-price quote £5m public liability cover Workmanship guarantee Founder-led carpentry and construction firm based in Cambridge, serving domestic clients across Cambridgeshire and the Fens. Fixed-price quotes, free site visits and a workmanship guarantee on every job. - Leave a Google review ## Services Carpentry in Cambridge - Second Fix Carpentry in Cambridge - Bathroom Fitting in Cambridge - Extensions in Cambridge - Brickwork in Cambridge - Roofing in Cambridge - Decking in Cambridge - Fencing in Cambridge - Handyman in Cambridge ## Areas We Cover - Cambridge - Wisbech - Peterborough - King's Lynn - St Neots - Huntingdon - March - Chatteris - Whittlesey ## Contact CV Carpentry & ConstructionCB3, Cambridge 07863 788018 charlievidlercarpentry@gmail.com Mon–Sun: 8am–10:30pmWednesday: 8am–5pm © 2026 CV Carpentry & Construction. All rights reserved. Privacy PolicyTerms & Conditions CVCarpentry.co.uk · Carpenter Cambridge · Cambridgeshire & the Fens WhatsApp UsCall CharlieFree Quote