Domestic Electrical Installation Quoting
You can't see behind the plaster. Your quote shouldn't pretend you can.
A rewire quote is a bet on two things you haven't inspected yet: what's actually behind the walls, and what state the board is really in once you isolate it. back-napkin's Electricians pack turns that uncertainty into a risk-adjusted price range — chasing, bonding remediation, and making-good priced in from the start, not absorbed as scope creep once the boards are up.
Electrical quoting goes wrong in the same places, job after job
Not bad luck — the same handful of risk factors that only surface once you're inside the job. back-napkin's Electricians pack models them directly instead of leaving them as gut feel.
Undocumented existing wiring
Old lighting circuits reused, no circuit records, mixed cable ages — a walk-through alone can't safely price a rewire in an older property. back-napkin flags this as a Likely risk, worth +0.5-2 crew-days for tracing and isolating before you've quoted a figure.
Bonding and earthing remediation found on inspection
Earthing and bonding issues are condition-triggered, not age-triggered — they surface once you're actually testing, not on the survey. back-napkin prices the earth-electrode materials and the extra day before it's a dispute with the client.
DNO delays on EV chargers and solar
A G98 job can become a G99 job once the existing load or supply type is surveyed properly — turning a 10-15 working day acknowledgement into a 30-60 working day approval wait. back-napkin's DNO risk is priced as schedule, not absorbed as your problem.
Plaster damage beyond the quoted allowance
Chasing and making-good is routinely underpriced or forgotten entirely. back-napkin flags it as a Likely risk on every rewire — extra skim and redecoration cost named up front instead of quietly absorbed or fought over after the job.
Start from the work you actually quote
Five Project Starters, each with a real work-item tree built on the trade's own stages — first fix, second fix, testing & certification.
Full / partial rewire
Survey and circuit schedule through chasing, cable running, consumer unit installation, testing and Part P notification, to making-good and handover — the whole job, staged the way electricians already sequence it.
Consumer unit replacement
Board and circuit survey, old board removal, circuit reconnection per RCBO way, dead and live testing, certification and Part P notification — a short, standardized job, and one of back-napkin's strongest candidates for pooling comparable actuals across users.
EV charger install
Site survey and G98/G99 route decision, dedicated circuit back to the board, charger mounting and earthing-arrangement check, then testing and DNO notification — standardized hardware and a standardized DNO decision tree make this the pack's other densest cross-user pooling candidate.
Kitchen electrics
Appliance and circuit schedule through dedicated cooker/hob circuits, ring and island socket runs, extractor circuits, and lighting, to testing and the Part P notification that's automatic for any kitchen circuit work — regardless of scale.
Solar + battery
Roof survey and system sizing through the DNO application and approval wait, DC and AC cabling, inverter and battery commissioning, to testing, EIC issue, and MCS commissioning certificate — the pack's highest-uncertainty Starter, with the DNO approval itself as a hard gate.
Built from real risk checklists, not generic advice
A sample of the risk items back-napkin checks against your estimate before you send the quote.
Undocumented/unknown existing wiring (old lighting circuits reused, no circuit records, mixed cable ages)
Likely — effort +0.5-2 crew-days for tracing/isolating; possible full-rewire scope creep from "partial".
DNO notification pushes job from G98 to G99 once surveyed (existing load higher than assumed, or three-phase supply)
Possible — 10-15 working day G98 acknowledgement becomes a 30-60 working day G99 approval wait before work can even start.
Existing circuits fail testing once isolated (faults only found at test)
Likely — effort +0.5-1 day to trace/repair before re-energising; job can't complete same-day.
Quote electrical installation work with the risk priced in
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