Free Property Renovation Tools
Plan your project with our instant calculators and checkers. No email required — results are shown immediately.
These free tools help London homeowners estimate costs, timelines, and return on investment before committing to a renovation project. Estimates are based on data from over 100 projects completed by All Well Property Services across 25 South East London boroughs between 2020 and 2026.
Every calculator adjusts for your borough, property type, and spec level. Results are instant — no email gate, no signup, no sales call required.
Cost Calculators
Kitchen Extension Cost Calculator
Get an instant estimate for your kitchen extension project in South East London. Factor in extension type, size, finish level, and your borough for a personalised cost breakdown.
Try it free →Cost CalculatorBathroom Renovation Cost Calculator
Get an instant estimate for your bathroom renovation in London. Choose your bathroom type, size, fixture quality, and scope for a detailed cost breakdown.
Try it free →Cost CalculatorLoft Conversion Cost Calculator
Estimate the cost of your loft conversion based on type (dormer, mansard, hip-to-gable), intended use, and location in South East London.
Try it free →Cost CalculatorPainting & Decorating Cost Calculator
Get an instant estimate for painting and decorating your home in London. Factor in room count, wall condition, paint quality, and your borough for a personalised cost breakdown.
Try it free →Cost CalculatorProperty Renovation Cost Calculator
Estimate the cost of renovating your property in London. Factor in property size, renovation scope, kitchen and bathroom inclusions, and your borough for a detailed cost breakdown.
Try it free →Cost CalculatorGarage Conversion Cost Calculator
Estimate the cost of converting your garage into living space. Factor in garage size, intended use, plumbing requirements, and your borough for a personalised cost breakdown.
Try it free →Cost CalculatorSide Return Extension Cost Calculator
Get an instant estimate for your side return extension in London. Factor in passage length, glazing type, kitchen fitout, and your borough for a detailed cost breakdown.
Try it free →Cost CalculatorDamp Proofing Cost Calculator
Estimate the cost of damp proofing your property in London. Factor in damp type, number of walls affected, replastering needs, and your borough for a personalised cost breakdown.
Try it free →Cost CalculatorSkip Size & Cost Calculator
Work out what size skip you need for your renovation and what it will cost. Covers kitchen refits, bathrooms, extensions, loft conversions and full renovations, plus street permits.
Try it free →Cost CalculatorRenovation Contingency Calculator
Find out how much contingency to hold on top of your renovation quote. Contingency varies by property age and whether the work is cosmetic or structural.
Try it free →Cost CalculatorRenovation Hidden Costs Estimator
Check whether your builder's quote is missing the hidden costs that surprise most homeowners. Tick what is included and see what you will need to pay separately.
Try it free →Cost CalculatorSelf-Manage vs. Main Contractor Cost Comparison
Compare the true cost of managing your own renovation versus hiring a main contractor. The tool prices in your time and the risk of things going wrong. Those are the numbers most self-managers ignore.
Try it free →Cost CalculatorBuilding Control Fees Calculator
Estimate LABC plan check and inspection fees for your project. Compare local authority Building Control against private Approved Inspectors, with borough cost adjustments.
Try it free →Cost CalculatorArchitect vs. Design-and-Build Cost Comparison
Compare the total cost of hiring an architect and tendering separately versus a design-and-build contractor who handles both. Factor in fees, markups, and structural engineer costs.
Try it free →Cost CalculatorRenovation VAT Rate Calculator
Find out whether your renovation qualifies for the 5% reduced VAT rate or zero rate under HMRC rules. Enter your property status and project value to see your potential saving.
Try it free →Cost CalculatorDecorator Day Rate Calculator
What you should pay a painter and decorator in London. Day rate, hourly, per room, or per square metre — adjusted for borough, prep level, and whether materials are included.
Try it free →Cost CalculatorRadiator BTU Calculator
Size radiators for a single room or a whole project. Outputs both watts and BTU, recommends actual radiator sizes you can shop with, and flags rooms where underfloor heating is the better answer. Built by a builder who orders radiators, not a retailer trying to sell you one.
Try it free →Cost CalculatorMedia Wall Cost Calculator
Price up a bespoke media wall the way we price one on a site visit: wall width, fireplace, joinery, cladding, and lighting, with a cost breakdown for each. Built from real South London media wall projects, not national averages.
Try it free →Cost CalculatorWet Room Cost Calculator
Price a wet room conversion the way we quote one: room size, drainage, tanking, underfloor heating, fixtures, and tiling, each itemised. Based on wet rooms we've built across South London, where the tanking is never an optional extra.
Try it free →Cost CalculatorHouse Extension Cost Calculator
Estimate any extension type — rear, side return, wraparound, or double-storey — by floor area, finish level, and glazing. Uses the £1,800–£2,500 per square metre rates from our completed South London builds. For kitchen or bathroom fit-out detail, our specialist calculators price those rooms separately.
Try it free →Value Calculators
Kitchen Extension Value Calculator
Estimate how much value a kitchen extension could add to your property. Calculate your return on investment based on your borough, property value, and extension type.
Try it free →Value CalculatorPost-Renovation House Value Estimator
Estimate what your property will be worth after planned renovation works. Select the improvements you're considering and get an estimated post-renovation value with a per-improvement breakdown and ROI figure.
Try it free →Compliance Checkers
Planning Permission Checker
Check whether your home improvement project is likely to need planning permission or falls under permitted development rights. Covers extensions, loft conversions, and more.
Try it free →Compliance CheckerParty Wall Agreement Checker
Find out if your building project requires a party wall agreement under the Party Wall Act 1996. Check what notices you need to serve and understand the process.
Try it free →Compliance CheckerExtension Size Calculator
Find out how big you can build your rear extension under permitted development rules. Enter your property type and garden dimensions for an instant maximum footprint calculation.
Try it free →Compliance CheckerLoft Conversion Permitted Development Volume Calculator
Will your loft conversion fit under permitted development? Check the 40 m³ (terraced) or 50 m³ (semi/detached) volume limit, plus the conservation area and highway-facing rules that kill PD entirely.
Try it free →Decision Tools
Extend or Move Calculator
Should you extend your home or move to a bigger property? Compare the total costs of each option including stamp duty, agent fees, and extension costs to make the right decision.
Try it free →Decision ToolWhich Renovation Should You Do First?
Answer eight quick questions about your property, budget, and priorities. Get a personalised recommendation for the renovation that'll give you the biggest win first.
Try it free →Decision ToolRenovation Readiness Checker
Twelve honest questions across money, timing, decisions, and risk tolerance. Get a readiness score out of 100 and a straight answer on whether you should start now or wait.
Try it free →Decision ToolIs Your Builder's Quote Fair?
Paste the numbers from your builder's quote and get an 8-dimension fairness score. Spot red flags on price, timeline, deposit, and what's been left out.
Try it free →Decision ToolLandlord & Tenant Painting Responsibilities Checker
Who pays for painting at end of tenancy and how much can the landlord deduct from the deposit? Based on the Landlord and Tenant Act 1985 and TDS adjudication patterns.
Try it free →Decision ToolConservatory vs Extension: Which Should You Build?
Answer three questions — budget, what the space is for, and whether it needs to work in January — and get a straight verdict between a conservatory, an orangery, and a proper extension, with honest cost ranges for each.
Try it free →Live Data Insights
Best Month to Renovate
See historic rainfall and temperature for your postcode every month, plus the best window for external work. Live data from the Open-Meteo archive (Met Office and ECMWF).
Try it free →Live Data InsightIs My House Listed?
Check whether your property is a listed building or sits inside a conservation area, and what that means for renovation work. Live data from Planning.data.gov.uk and Historic England.
Try it free →Live Data InsightPlanning Permission Risk Checker
Traffic-light check of every planning restriction at your postcode: listed buildings, conservation areas, Article 4 directions, Tree Preservation Orders, flood zones. Live data from Planning.data.gov.uk.
Try it free →Live Data InsightEPC Upgrade Cost Calculator
Find your home's current EPC rating and see what it would cost to upgrade to a B. Uses live data from the EPC Open Data register.
Try it free →Live Data InsightPaint Calculator — How Much Paint Do I Need?
Work out how many litres of emulsion a room actually needs, in tins you can buy. Uses the 12m² per litre coverage paint really achieves on London plaster, not the optimistic figure on the tin. Includes ceiling, woodwork, and mist coat guidance.
Try it free →