Practical renovation tools for South West London homeowners.
Free guides and checklists from a client-side project manager — built for extensions, loft conversions and full-house renovations, not landlord software and not a SaaS product.
Prefer to talk it through? Call 07525 474 849 or enquire — no fee for the first conversation.
Guides and worksheets you can use today
- Interactive calculator
Renovation fees calculator (London)
Every professional and statutory fee, start to finish — architect or drawings, planning or LDC, structural engineer, party wall, building control, builder tender, JCT contract, build-stage visits and project management. Sourced London ranges, ex VAT.
Open resource - Interactive calculator
Extension cost calculator (London)
Rear, side return, wraparound or double-storey — size, spec and extras (kitchen, bifolds, rooflights, underfloor heating) to a London build cost range, ex VAT. Carries straight into the fees calculator.
Open resource - Interactive calculator
Loft conversion cost calculator (London)
Velux, rear dormer, L-shaped dormer, hip-to-gable or mansard, with or without an en-suite — a London build cost range from published prices, ex VAT.
Open resource - Interactive checker
Planning permission checker (London)
Rear, side-return, wraparound, dormer, mansard or basement: see whether it is likely permitted development, prior approval or a householder application, with the council pages to check for your borough. Guidance only.
Open resource - Interactive calculator
Extension and loft timeline calculator
First drawings to moving back in: design, planning or LDC, party wall notices, tender, lead-in, build and snagging, with each borough's latest householder planning figures.
Open resource - Interactive calculator
Extension cost overrun calculator
Enter the price a builder has quoted and see what it realistically becomes — scope missing from the quote, variations from unforeseen work, changes made mid-build and programme slip, separated out. Shows how much of the gap is the avoidable kind.
Open resource - Checklist + CSV
Builder quote comparison checklist
Line up three quotes like-for-like before you look at the totals — exclusions, provisional sums, steels, drainage, scaffold and making-good. Printable page, plus downloadable CSV worksheet (Quote A/B/C columns).
Open resource - Budget planner
Extension / loft budget planner
Indicative 2026 sheet for works bands, professional fees, contingency and an optional client-side PM line. Not a quote — caveats on the page.
Open resource - Guide
Who does what on a SW London renovation
Architect, structural engineer, party wall surveyor, building control, main contractor and client-side PM — plain roles so you know who to appoint and when.
Open resource
Still in draft
Same enquire / phone CTAs — no product login, no SaaS upsell.
- Tool B — soon
Snagging tracker
Room-by-room handover tracker for owner-occupiers — defects, photo refs, owner vs builder responsibility, retest dates. Not an HMO inventory.
Fees and how engagement works: renovation project manager cost. What the service covers: client-side PM services. Case studies: SW London projects. New reads: PM vs architect CA · When a PM makes sense.
Send me the figures and I will tell you what is missing.
No obligation chat for SW London extensions, lofts and renovations — phone or enquire.
Discuss your projectOr speak to Ben directly: 07525 474 849 · benmurrell83@gmail.com