Extension, Loft and Renovation Guides
Plain-English 2026 cost and planning guides for UK homeowners, written by a Southampton design-and-build team: what extensions, loft conversions, renovations and bathrooms really cost, the rules behind them, and the order to do things in.
How we price our guides: figures are cross-checked against published UK trade cost guides and official fee schedules, last checked in October 2026, and every guide shows when it was last updated. For your own project, see our Southampton renovation services or meet the team.
House extensions and planning
What an extension costs, single or double storey, planning permission and party wall rules, and the doors that make the room.
House Extension Cost UK 2026: Prices per m² and by Type
Realistic 2026 prices for single-storey, double-storey, side-return and kitchen extensions, by size and region, plus the fees and hidden costs most quotes leave out.
Single-Storey vs Double-Storey Extension: Which Is Right?
Extending out or up? Real 2026 costs per m² and in total, the permitted development rules for each, build times, value added and a straight checklist for choosing.
Do You Need Planning Permission for a House Extension?
Permitted development or full planning permission? The 2026 size limits, the rules that catch people out, application fees and timescales, and why building regulations apply either way.
Party Wall Agreement Explained: Costs, Notices and Process
When the Party Wall Act applies to an extension or loft conversion, which notice to serve and when, what surveyors cost, how an award works, and what to do if your neighbour does not reply.
Bifold vs Sliding Doors: Costs, Pros and Cons (2026)
The real differences between bifold and sliding doors, what each costs in 2026 by material and panel count, and a straight answer on which suits your extension.
Loft conversions, garage conversions and garden rooms
Adding space without building out: what each option costs, the permitted development limits and the building regulations behind them.
Loft Conversion Cost UK 2026: Prices by Type and Size
What a loft conversion really costs in 2026, by type and size, with the fees, extras and building regulations that shape the final figure, a worked example and how long each type takes.
Garage Conversion Cost UK 2026: Prices and Planning
What it costs to turn a garage into a bedroom, office, playroom or utility in 2026, line by line, with the planning catches on newer estates and the building regulations that apply.
Garden Room Cost UK 2026: Prices by Size, Spec and Extras
What a garden room or garden office really costs in 2026, by size and specification, with a component breakdown, the extras that add up, running costs, the permitted development rules and a worked Southampton example.
Full house renovations
Budgets, the right order of works, rewiring and renovating period homes, plus fitted joinery to finish the job.
Full House Renovation Cost UK 2026: Prices per m²
Realistic 2026 costs to renovate a house, broken down by specification, region, house size and job, with budget scenarios, hidden costs, VAT rules and a worked Southampton example.
House Renovation Order of Works: 11 Stages in Order (2026)
The eleven-stage sequence a full house renovation should follow, how long each stage takes, what first fix and second fix mean, and the ordering mistakes that mean paying twice.
Cost to Rewire a House UK 2026: Prices by Size
What a full or partial rewire costs in 2026 for flats and two, three and four-bedroom houses, the making good most quotes leave out, how long it takes and the signs your wiring is due.
Renovating a Victorian House: Costs, Sequence and Pitfalls
A practical guide to renovating a Victorian terrace or villa: what the survey should find, realistic 2026 costs, the right order of works, restoring original features and insulating without causing damp.
Fitted Wardrobes Cost UK 2026: Price per Metre Guide
What fitted wardrobes really cost in 2026, from flat-pack to bespoke joinery, by type, material and door style, with installation costs, the factors that move the price and a straight answer on whether they are worth it.
Bathrooms, en-suites and wet rooms
What a new bathroom costs, how to make a small room work, and whether a wet room or walk-in shower suits you.
New Bathroom Cost UK 2026: Prices by Type and Size
What a new bathroom really costs in 2026: national averages, cost by type and size, labour and materials broken down, regional prices, timescales, regs and a worked Southampton example.
25 Small Bathroom Ideas That Actually Work (UK Layouts)
Twenty-five practical ideas for a small bathroom, en-suite or cloakroom: layouts with real dimensions, shower and bath options, storage, the tricks that make a room feel bigger, and what it costs in 2026.
Wet Room vs Walk-In Shower: Which Should You Choose?
The real differences between a wet room and a walk-in shower, what each costs in 2026, how the waterproofing and drainage work, and a straight answer on which to choose.
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