Plain answers before you build
Costs, planning rules and practical advice for extensions, loft conversions and renovations in Kingston, Surbiton, Richmond, Barnes, Putney, Fulham, Chelsea, Clapham and Wimbledon. Written from the projects we build, with official sources linked.
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CostsHow Much Does a House Extension Cost in South-West London in 2026?
What a house extension costs in Kingston, Richmond, Putney and nearby in 2026: real guide prices, cost drivers, extra fees and how to keep your budget on track.
Planning and rulesDo I Need Planning Permission for an Extension? A Council-by-Council Guide for South-West London
Permitted development limits, prior approval and the council for Kingston, Richmond, Putney, Fulham, Chelsea, Clapham and Wimbledon, explained simply with official sources.
CostsLoft Conversion Types and Costs: Dormer, Hip-to-Gable, Mansard or Rooflight?
Dormer, hip-to-gable, mansard or rooflight? Compare loft conversion types, costs from £50,000 plus VAT, planning rules and head height for south-west London homes.
Local guidesHow to Choose a Builder in Kingston upon Thames: 12 Questions to Ask Before You Sign
12 questions to ask before you hire a builder in Kingston, Surbiton or south-west London: quotes, contracts, insurance, certificates, payments and guarantees explained.
Period homes and designSide Return Extensions for Victorian Terraces: A Practical Guide for Fulham, Clapham and Putney
How a side return extension works on a Victorian terrace: planning, party walls, light, drainage, structure and cost from £60,000 plus VAT, with tips for south-west London.
CostsKitchen and Bathroom Renovation Costs in South-West London: What You Pay For
What a kitchen or bathroom renovation costs in Kingston, Putney and Richmond: guide prices from £4,500 plus VAT, the biggest cost drivers and the rules that apply.
Planning and rulesThe Party Wall Act Explained: Notices, Timescales and Costs for London Extensions
When you need a party wall notice for an extension or loft conversion in London, the 1 and 2 month notice periods, the 3 m and 6 m rules, and who pays the surveyors.
Local guidesExtending a House in Surbiton and Kingston: Local Planning, House Types and Recent Projects
Extending a house in Surbiton or Kingston upon Thames: local house types, conservation areas, Kingston Council planning, costs from £60,000 plus VAT and recent Prohaus projects.
Planning and rulesBuilding Work in a Conservation Area: What Homeowners in Richmond, Barnes, Kingston and Chelsea Need to Know
Which extensions, lofts, windows and outbuildings need permission in a conservation area, how Article 4 directions work, and how to get approval in south-west London.
Planning and rulesPrior Approval for Larger Rear Extensions: The 6 Metre and 8 Metre Rule Explained
How the prior approval route lets you build a single-storey rear extension up to 6 m (8 m detached) without full planning permission: rules, process, timescale and pitfalls.
Planning and rulesGarden Offices: Planning Rules, Building Regulations and What to Ask Before You Build
Do you need planning permission or building regulations for a garden office in London? Height limits, the 15 and 30 square metre rules, power, foundations and what to ask a builder.
CostsExtend or Move? The Real Cost Comparison for South-West London Homeowners
Should you extend or move in south-west London? Compare stamp duty, agent and legal fees with extension and loft conversion costs, with worked examples and a decision checklist.
Period homes and designTimber Sash Windows: Repair, Upgrade or Replace? A Guide for Period Homes
How to decide between repairing, upgrading or replacing timber sash windows in a period home, with conservation area rules, double glazing options and building regulations.
Local guidesRenovating a 1930s Semi: Extensions, Lofts and Layouts that Work in Tolworth, Berrylands and Chessington
How to extend and renovate a 1930s semi in Tolworth, Berrylands, Chessington and New Malden: hip-to-gable lofts, wrap-around extensions, layouts, planning and costs.
Planning and rulesPlanning Permission vs Building Regulations: What Is the Difference?
Planning permission decides whether you can build; building regulations decide how it is built safely. What each covers, when you need one or both, and who approves them.
ProcessHow Long Does a House Extension Take? A Week-by-Week Timeline
A realistic timeline for a single-storey rear extension in London: design, planning, party wall notices, then about 10 to 14 weeks on site, with a week-by-week example programme.
Planning and rulesLoft Conversion Building Regulations: Fire Safety, Stairs, Insulation and Head Height
The building regulations every loft conversion must meet: structure, fire escape, fire doors, smoke alarms, stair headroom, insulation and ventilation, explained for London homeowners.
Local guidesLoft Conversions in Wimbledon and Putney: House Types, Planning and Costs
Loft conversions in Wimbledon (Merton) and Putney (Wandsworth): which loft suits each house type, conservation areas to check, planning routes and costs from £50,000 plus VAT.
Period homes and designOpen-Plan Kitchen Extensions: Light, Layout and Structure
How to plan an open-plan kitchen extension in a London home: layouts, islands, light, steel, heating, acoustics and fire safety, with real Prohaus projects and costs.
CostsWhat Does a Whole-House Renovation Cost? Budgeting a Period Home Refurbishment
What a whole-house renovation costs in south-west London, from £100,000 plus VAT at Prohaus: what is included, cost drivers for period homes, the order of work and how to budget.
CostsHidden Costs of Building Work: 12 Items Missing from Cheap Quotes
The 12 costs most often left out of extension and renovation quotes in London, from party wall surveyors to skip permits, and how to spot them before you sign.
ProcessWhat a Good Building Quote Looks Like: Itemised vs Lump Sum
How to read a builder's quote for an extension or renovation: itemised vs lump sum, provisional sums, exclusions, payment stages and variations, with a comparison checklist.
Planning and rulesArticle 4 Directions in Fulham and Chelsea: What They Mean for Your Windows, Roof and Extension
What Article 4 directions mean for windows, doors, roofs, boundary walls and basements in Fulham and Chelsea, how to check your street, and how to get approval.
Planning and rulesLawful Development Certificates: When You Need One and Why Buyers Ask for It
What a Lawful Development Certificate is, when to get one for a permitted development extension, loft or garden office, how to apply, and why buyers' solicitors ask for it.
Period homes and designAluminium vs Timber vs uPVC: Choosing Doors and Windows for an Extension
Compare aluminium, timber and uPVC for sliding doors, bi-folds and windows in a London extension: sightlines, insulation, maintenance, conservation areas and building regulations.
Period homes and designRooflights and Glass Roofs in Extensions: What Works in London Terraces
Flat rooflights, lanterns, pitched roof windows and glass roofs for London extensions and side returns: light, heat, condensation, planning and building regulations explained.
CostsBespoke Joinery Costs: Fitted Wardrobes, Alcove Units and Staircases
What bespoke joinery costs in south-west London, from £1,200 plus VAT at Prohaus: fitted wardrobes, alcove units, media walls, window seats and staircases, and what affects price.
Period homes and designBespoke Storage for Victorian and Edwardian Homes: Alcoves, Eaves and Under-Stairs
Bespoke storage ideas for Victorian and Edwardian homes: alcove units, fitted wardrobes in chimney recesses, eaves storage in lofts, window seats and under-stairs drawers.
ProcessCan You Live at Home During an Extension or Loft Conversion?
What it is really like to live at home during an extension, loft conversion or renovation, when moving out makes sense, and how to set up a temporary kitchen and stay safe.
ProcessPreparing Your Home and Neighbours for Building Work: A Checklist
A practical checklist before an extension, loft or renovation starts: neighbours, party wall notices, permits, insurance, asbestos, clearing rooms, parking and working hours.
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