LASTING LTD — SUPER-MEGA Calculator 2025
One file: Calculator + Options Sheet + Sheets Receiver + PIN approvals + Audit + Health Monitor + Playbooks + WhatsApp Digest. Client sharing is ONLY by button.
WhatsApp-first lead flow + Admin controls
Auto borough/ward from postcodes.io (rate-limited). Stored into lead for learning.
Options (Add-ons)
Loaded from Options Sheet (or fallback)
Types:
per_m2 / fixed / per_bathroom / per_kitchenAdmin can manage options in Google Sheet. This page pulls them via endpoint with API key.
*Estimate only. Final quote confirmed after survey/spec. Receiver submission creates a Lead/Quote draft + PIN tokens (server-side recommended).
*Guide only. Final depends on structure/spec.
Owner PIN LOCKED
Receiver offline
Health —
Admin features require Owner PIN. Stored only in session (not sent).
Local Leads (stored in browser)
You can run Share+Email only by button (admin). Use this as your decision panel.
| Date | QuoteID | Client | Project | Total | Status | Actions |
|---|
Creates a short WA digest from latest 10 local leads. (No auto-send; opens WA link.)
Playbooks (manual run only)
Each lead can have a playbook steps list. You run steps by button. (Logged into audit.)
Estimated total
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—
Labour—
Materials—
Options (add-ons)—
Subtotal—
Contingency—
VAT—
Location
London
Postcode: —
Local System Status
—
Builders in [AREA] – Extensions, Loft Conversions & Renovations
LASTING LTD provides house extensions, loft conversions, full renovations, kitchens, bathrooms and RSJ structural works in [AREA] and nearby areas.
Fast quote: send your postcode + photos on WhatsApp: 07448 886776
Services in [AREA]
- House Extensions London
- Single Storey Extension
- Side Return Extension
- Wrap-Around Extension
- Double Storey Extension
- Loft Conversion London
- House Renovation
- Kitchen Renovation
- Bathroom Renovation
- RSJ Installation
Typical Price Guide (2025)
- Single-storey extension: £35,000–£65,000
- Side return extension: £25,000–£45,000
- Wrap-around extension: £70,000–£140,000
- Dormer loft: £35,000–£55,000
- Hip-to-gable loft: £45,000–£65,000
- Mansard loft: £55,000–£85,000
- Full renovation: from £15,000+
Open full PDF: PRICE GUIDE 2025
Our Process (6 Steps)
- WhatsApp enquiry / call
- Site visit & measurements
- Written quote (scope + options)
- Programme & ordering
- Build phase (clean & managed)
- Handover & aftercare
Nearby areas we cover
[NEARBY]
FAQ
Do you work in [AREA]?
Yes. Send your postcode + photos on WhatsApp and we will confirm availability.
Can you give an estimate from photos?
Yes. Share photos + rough dimensions and we’ll give initial guidance quickly.
Do you provide a written quote?
Yes — clear scope, inclusions/exclusions and options.