1 London Road, Alderley Edge, Cheshire, SK9 7JU info@kiif.co.uk01625 830714 HomeAboutServicesBuilding ContractorsOne contract for the whole buildNew BuildBespoke homes and developmentsRenovationWhole-house renovation programmesRefurbishment & RestorationPeriod buildings brought up to dateLandscapingExternal works and hard landscapingPlasteringSkimming, rendering and lime workJoineryStructural carpentry and fitted joineryRoofingNew roofs, re-roofing and repairsGroundworksFoundations, drainage and site works View all services Areas We CoverCounties & Regions - Alderley EdgeOur home village: office and yard on London Road. - CheshireCounty-wide building work from our Alderley Edge base. - ManchesterPeriod refurbishment and commercial fit-out in South Manchester. - LancashireNew builds and conversions north of the Cheshire border. - YorkshireStone-built property and rural schemes across the county. - MerseysideCommercial conversions and coastal refurbishment work. Towns - WilmslowTwo miles from base: extensions, refurbishment and conversions. - KnutsfordTown centre period property and rural barn conversions. - MacclesfieldStone terraces, hillside sites and retaining structures. - PrestburyHigh-specification homes delivered discreetly. - StockportResidential, commercial and industrial work across the borough. - BramhallSuburban extensions and remodelling on close-packed plots. View all areas we cover Our WorkReviewsContact01625 830714Request an Estimate - Home - Services - Extensions & RemodellingExtensions & remodelling # House Extensions InCheshire That Make TheWhole Home Work Better Most extensions add floor area and solve nothing, because the new space is bolted onto a layout that was already wrong. We plan the extension and the internal remodelling together, build both with our own trades, and hand back a house that reads as one building rather than an old one with a new box attached. Request an Estimate01625 830714 Family-run in Alderley Edge with more than 40 years in construction. Site visit at no cost, you meet the team who will do the work. 40+ years Experience across residential, commercial and industrial construction. Directly employed Joiners, bricklayers, plasterers and groundworkers on our own books. In-house support Estimating, procurement and customer service handled in the office, not outsourced. Family-run Keep It In Family, David Cain leads delivery, Victoria Kennedy leads project management and design. The service ## Extending and remodelling, planned as one job An extension is a structural intervention into a building that is already standing, already occupied and already carrying loads through walls you cannot see inside. That is what makes it harder than a new build of the same size, and it is why the difference between contractors shows up so clearly: the new brickwork is the easy part, while the junction between old and new is where the value sits. KIIF delivers everything from single-storey rear and side extensions through to large two-storey wraparound developments, and the internal remodelling that makes them worth doing, removing walls, relocating staircases, moving kitchens and bathrooms, reworking circulation so the finished house has one logic rather than two. Our project at The Willows is a good example: a 1970s three-bedroom dormer, extensively remodelled with a two-storey wraparound extension, delivered in approximately twenty weeks. Because much of our workforce is directly employed, the same joiners, bricklayers and plasterers move through the job in sequence. That matters more on extensions than anywhere else, because the person forming the opening should be the person who understands what is being fitted into it three weeks later. We work alongside your architect and structural engineer where you have them, and can review buildability before drawings are frozen, a beam that is simple on a drawing and impossible to physically get into the room is the classic example of a problem that costs nothing to fix on paper and thousands to fix on site. ### Who this is for - Families who need more space but do not want to leave the area, the schools or the plot - Owners of 1960s–1990s houses with generous plots and poor internal layouts - Clients wanting to open the rear of the house to the garden with large glazed openings - Anyone whose kitchen, utility and family space are three cramped rooms that should be one - Homeowners with planning consent or permitted development rights who need a contractor to deliver it properly What poor delivery costs ## What a badly built extension costs you later Extension problems are almost all interface problems, and they surface after the decorators have left. These are the ones we see most often when we are called in to put someone else's work right. ### Cracking at the junction New foundations settle at a different rate from a fifty-year-old building. Without correctly designed movement joints and tied-in brickwork, the crack appears at the junction within the first year and reopens every time it is filled. ### Damp and cold bridging Where cavity trays, DPCs and insulation continuity are not carried through the junction, water tracks into the existing wall and heat leaves through the gap. The visible symptoms, staining, mould at the reveals, a room that never warms up, appear a winter later. ### Foundations undermined by trees or drains Excavating near mature trees, existing drain runs or a neighbouring boundary without proper investigation risks undermining what is already there. Remedial underpinning costs a multiple of the survey that would have prevented it. ### Extending without remodelling A large new room reached through a narrow original hallway makes the house feel worse, not better. Floor area is not the same as usable space, and this is the most expensive mistake because the building work itself was competent. ### Unresolved party wall and boundary issues Work close to or on a shared boundary that starts without the correct notices and awards in place can be stopped, disputed and delayed, with the client carrying the standing costs. ### Services routed as an afterthought Heating, ventilation and electrics squeezed in after the structure is built produce dropped ceilings, boxed corners and radiators in the only place a sofa fits. Set out at first fix, none of that happens. Our process ## A fixed sequence, so you always know what happens next - Step 1 ### Site visit and survey We walk the existing house with you, look at the structure, drains, levels, access and boundaries, and talk about how you use the rooms now and what is failing about them. - Step 2 ### Design coordination and buildability We work with your architect and structural engineer, or help shape the brief with Victoria Kennedy, and flag details that will be difficult, disruptive or expensive to build before the drawings are frozen. - Step 3 ### Estimate and programme In-house estimators price the work element by element: groundworks, structure, envelope, services, remodelling and finishes. You get a breakdown and a sequenced programme, including how long the house will be genuinely disrupted. - Step 4 ### Enabling works and structure Site protection, temporary works, foundations and drainage diversions, then the shell: brickwork, steelwork, structural openings, roof and weathertight envelope, tied and trayed correctly into the existing building. - Step 5 ### Remodelling, first fix and finishes Internal walls removed, layouts reworked, mechanical and electrical first fix set out against final furniture layouts, then plastering, joinery, tiling, decoration and kitchen or bathroom installation. - Step 6 ### Verification, snagging and handover Services tested, building control sign-off supported, external works made good, snagging closed out and the site cleared properly, including the bits behind the shed. What you get ## The practical difference a directly employed team makes ### Less time living in a building site A directly employed team on site continuously, rather than trades arriving when their other jobs allow, is the only reliable way to shorten the period your kitchen is in the garage. ### Old and new that match Brick matching, mortar colour, ridge and eaves alignment, floor level continuity and consistent joinery detail are what make an extension read as original rather than added. ### Structure done once, properly Beams sized and installed with the right bearings, padstones and fire protection, and movement joints and cavity trays detailed at every junction, so nothing cracks or damps back later. ### A layout that actually works We plan the remodelling with the extension, so circulation, natural light, storage and sightlines improve across the whole house instead of only in the new part. ### Costs visible before you commit Element-level pricing means you can compare a rooflight against underfloor heating against a wider opening, with real figures, before anything is ordered. ### One number to call Victoria handles day-to-day liaison and David leads delivery. No coordinating between six trades who each blame the last one. Detail ## Extension types, structural methods and materials Extensions differ enormously depending on the age of the host building, its construction and what you are trying to achieve. This is the range of work we take on and the detail that decides the outcome. ### Types of extension we build Single-storey rear extensions are the most common and usually the most transformative, particularly where the aim is one large kitchen, dining and family space open to the garden. Side and side-return extensions capture dead space on narrow plots. Two-storey and wraparound extensions add bedroom and bathroom accommodation above new ground-floor space, and are structurally the most demanding because loads must be carried down through the existing building. Beyond those, we build over-garage extensions, porches and entrance reconfigurations, garden rooms and annexes, dormer and loft conversions where roof volume allows, and full remodelling projects where the extension is a small part of a whole-house reorganisation. - Single-storey rear and side extensions - Two-storey and wraparound extensions - Over-garage and first-floor extensions - Dormer and loft conversions - Garden rooms, annexes and outbuildings - Whole-house internal remodelling ### Structure, openings and glazing Removing a rear wall to create an open-plan space means transferring its load into a steel beam or goalpost frame, with padstones, correct bearings, fire protection and, where the frame carries a two-storey load, foundations designed for the new point loads. Large sliding or bifold openings add a further requirement: the head must be stiff enough that deflection does not bind the doors, which is a common cause of a brand-new door that will not glide after six months. Foundations to the new element are usually trench fill or strip, deepened where trees, drains or nearby structures require it, with underpinning where excavation would otherwise undermine existing footings. Where levels drop away, we form retaining structures and step foundations rather than importing fill against a wall that was never designed to hold it back. - Steel beams, goalposts and portal frames - Structural openings, padstones and fire protection - Trench fill, strip and deepened foundations - Underpinning and temporary works - Aluminium sliding, bifold and fixed glazing installation - Rooflights, lanterns and flat-roof glazing ### Roofs, envelope and matching materials Single-storey extensions typically use a flat warm-deck roof, often with a lantern or rooflights, or a pitched roof tied into the existing at an abutment. Both need correct falls, upstands, and lead or proprietary flashings at the junction with the host wall. Two-storey work generally continues the existing roof line, which makes tile and slate matching, ridge height and verge detail critical to the finished appearance. Externally, we match facing brick, mortar colour and pointing style, or finish in render or timber cladding where the design deliberately distinguishes new from old. Both approaches work; what fails is an unintentional near-match, which draws the eye straight to the join. ### Remodelling: the part that changes daily life Internal remodelling covers removing and forming walls, relocating and rebuilding staircases, moving kitchens, adding utilities and boot rooms, converting bedrooms into en suites, reconfiguring landings, and reworking storage. On 1960s–1990s houses in Cheshire, generous plots are frequently paired with fragmented internal layouts, so the remodelling delivers more perceived improvement per pound than the extension itself. We set out mechanical and electrical first fix against final furniture and appliance layouts, islands, boilers, ventilation, underfloor heating zones and lighting circuits, because that is what determines whether the finished room feels designed or improvised. ### Domestic and commercial extensions Domestic extensions are delivered around an occupied home, so dust control, safe routes, temporary kitchens, and keeping neighbours informed are part of the job rather than a courtesy. Commercial extensions bring different priorities: trading continuity, statutory compliance, fire strategy and out-of-hours working. KIIF works across residential, commercial and industrial sectors, so where a project mixes the two, a home office, a substantial outbuilding, or an extension to premises, it can be handled under one contract. Recent work ## House extensions and remodelling we have delivered Questions clients ask ## Before you commit to the work How much does an extension cost in Cheshire?The honest answer is that cost is driven by structure, ground conditions, glazing and specification rather than by square metres, so anyone quoting a rate per square metre before seeing the house is guessing. We survey, then price element by element, foundations, structure, envelope, services, remodelling, finishes, so you can see what drives the figure and adjust with real numbers in front of you. How long does an extension take to build?A single-storey extension is typically a matter of weeks; a substantial two-storey wraparound with internal remodelling runs considerably longer. For context, our project at The Willows, a 1970s dormer extensively remodelled with a two-storey wraparound extension, took approximately twenty weeks. You receive a sequenced programme with your estimate, including which weeks are the disruptive ones. Do I need planning permission for an extension?Many single-storey rear extensions fall under permitted development, while two-storey work, extensions in conservation areas and anything affecting a listed building generally need consent. Building Regulations approval is required either way. We work with your architect or planning consultant, and we will tell you plainly at the site visit which route your project is likely to take. Can I stay in the house during the work?Usually yes for single-storey rear work, with a temporary kitchen arrangement during the connection period. Extensive whole-house remodelling or two-storey work over occupied rooms is sometimes better done with the family out for part of the programme. We tell you which weeks are genuinely disruptive so you can plan rather than discover. Will the extension match the existing house?Where you want it to, yes: brick and mortar matching, tile and slate selection, ridge and eaves alignment, floor level continuity and matching joinery details. Where a design deliberately contrasts new and old, we make that contrast clean and intentional. What we avoid is the accidental near-match that highlights the join. Do you handle the structural work and the beams?Yes. We work to your structural engineer's design, or coordinate one, and install steel beams, goalpost frames, padstones and fire protection ourselves, including the temporary works and any underpinning that excavation requires. Do you deal with party wall matters?We will identify at survey stage where party wall notices are likely to be needed, and we coordinate our programme around the notice periods and surveyors' awards. The formal award process is handled by a party wall surveyor appointed for that purpose. How long should an extension last?Built with correct foundations, cavity trays, insulation continuity and properly detailed roof junctions, an extension is a permanent part of the house with the same lifespan as the original. Extensions that fail early almost always fail at the interfaces, which is precisely the work we keep with our own trades. Can you work with my architect's drawings?Yes, and ideally before they are finalised. We regularly work with clients' architects, structural engineers and M&E consultants, and an early buildability review catches details that are cheap to change on paper and expensive to change on site. Which areas do you cover for extensions?We are based at 1 London Road, Alderley Edge and work across Cheshire, Greater Manchester, Lancashire, Yorkshire and Merseyside, including Wilmslow, Knutsford, Macclesfield, Prestbury, Stockport and Bramhall. Related work ## Often delivered alongside this ### Refurbishment & Restoration Where the existing fabric needs upgrading as well as extending. View service ### New Build Projects When demolition and rebuild makes more sense than extending. View service ### External Works & Landscaping Patios, drainage and garden works that connect the new space to outside. View service We deliver this service across Alderley Edge, Wilmslow, Bramhall, Macclesfield and the wider North West. See recent projects, read about the family behind KIIF or return to the homepage. ## Find out what your housecould actually become Send us the drawings if you have them, or just tell us what is not working. We will survey the house, explain what is structurally possible and price it element by element, so the decision is made on facts, not a lump sum. 01625 830714Request an Estimate - Family-run, over 40 years in construction - Directly employed joiners, bricklayers and groundworkers - In-house estimating and procurement - Site visit with the team who will build it ### Tell us about your project Send the details and we will arrange a site visit at a time that suits you. Keep It In Family. A family-run building contractor in Alderley Edge with over 40 years' experience across residential, commercial and industrial construction. ### Services - Building Contractors - New Build - Renovation - Refurbishment & Restoration - Landscaping - Plastering - Joinery - Roofing - Groundworks ### Areas We Cover - Alderley Edge - Cheshire - Manchester - Lancashire - Yorkshire - Merseyside - Wilmslow - Knutsford - Macclesfield - Prestbury - Stockport - Bramhall ### Get In Touch KIIF Limited1 London Road, Alderley EdgeCheshire, SK9 7JU 01625 830714 info@kiif.co.uk Request an Estimate © 2026 KIIF Limited. All rights reserved. ReviewsCookie PolicyPrivacy PolicyTerms & Conditions Call UsGet Estimate