Reviewed, sourced guidance

Plumbing Calculator method and limits

Published 24 Sept 2026Reviewed 25 Sept 20261 min read

Direct answer

The comparison tool calculates the spread between user-entered totals and counts which scope items each written quote explicitly documents. It does not transmit or store entries, adjust VAT or rank providers.

This preview helps customers compare documents. It does not estimate plumbing costs, diagnose faults, assess contractors or collect enquiries.

Key takeaways

Amounts and checkboxes remain in the current browser page.
The calculator compares entered figures only.
Official source pages are linked for readers to verify.
Corrections and review dates will be updated as sources change.

Evidence note

Buyer information with a local-only quote worksheet and published source limits.

View the full evidence note

Produced by: Plumbing Calculator
Jurisdiction: UK-wide consumer information. Building and water rules can vary by nation and work type; check the current authority for the property and job.
Page scope: Method, source and privacy disclosure for the Plumbing Calculator information preview.
Default subject: Preparing comparable plumbing quote briefs, identifying undocumented scope, checking relevant public registers, and keeping completion records.
Excludes: Plumbing diagnosis, engineering calculations or installation advice; Prices, cost predictions, quotations or affordability decisions; Contractor rankings, recommendations or provider verification; Emergency dispatch, lead capture or referral services
Published: 2026-09-24
Reviewed: 2026-09-25
Commercial status: Information publisher only. No plumbing business is listed, no enquiry is collected, and no lead or affiliate link is active.

This first pass has no independent price dataset, provider verification, local service coverage or operator-led technical review.

How this guidance is produced · About the method and sources

Source review cadence

Every source cited on this site carries a dated check and a recheck trigger, so stale evidence is replaced rather than quietly relied on.

Source	Last checked	Recheck	Triggers an early review
HSE, domestic gas engineer and homeowner safety guidance (observed 2026-09-28)	2026-09-28	every 90 days	Official guidance, scheme scope or lookup changes; A claim tied to this source changes
Gas Safe Register, find and check a registered engineer (observed 2026-09-28)	2026-09-28	every 90 days	Official guidance, scheme scope or lookup changes; A claim tied to this source changes
National Gas, emergency contacts and gas safety advice (observed 2026-09-27)	2026-09-27	every 90 days	Official guidance, scheme scope or lookup changes; A claim tied to this source changes
nidirect, Northern Ireland Gas Emergency Service advice (updated 17 December 2015; observed 2026-09-27)	2026-09-27	every 90 days	Official guidance, scheme scope or lookup changes; A claim tied to this source changes
GOV.UK, Approved Document G (May 2024 amendment; observed 2026-09-25)	2026-09-25	every 90 days	Official guidance, scheme scope or lookup changes; A claim tied to this source changes
WaterSafe, customer FAQs on approved plumbing businesses (observed 2026-09-25)	2026-09-25	every 90 days	Official guidance, scheme scope or lookup changes; A claim tied to this source changes
WaterSafe, find a local approved plumbing business (observed 2026-09-28)	2026-09-28	every 90 days	Official guidance, scheme scope or lookup changes; A claim tied to this source changes
WaterSafe, planning plumbing work and obtaining quotes (observed 2026-09-27)	2026-09-27	every 90 days	Official guidance, scheme scope or lookup changes; A claim tied to this source changes
Water Regs UK, approved-contractor scheme scope (observed 2026-09-25)	2026-09-25	every 90 days	Official guidance, scheme scope or lookup changes; A claim tied to this source changes
Checkatrade, plumbing installation cost guide (observed 2026-09-25; publisher estimates)	2026-09-25	every 45 days	Publisher survey date, cost scope or estimates change; Cost wording on this site changes

How the worksheet calculates

Model 2026-09-25-v2 compares two or three positive totals, shows the difference between the lowest and highest entered values, and reports which items were marked in writing.

A missing checkbox means “not confirmed here”, not necessarily “excluded”. VAT status is flagged when unclear or inconsistent.

Privacy and commercial status

The form has no submission endpoint and asks for no name, phone number, address or access code. Values stay in the current page and are not written to website storage.

No provider is listed, ranked, contacted or sent a lead. No affiliate link is active in this preview.

Sources and review triggers

Primary legal, gas-emergency and scheme links are provided for readers to check. A competitor cost guide is used only to understand existing buyer guidance; its prices are not copied into this site.

Review source pages when official guidance changes, a linked directory changes its scope, or a reader reports an error.

Sources for this section: HSE, domestic gas engineer and homeowner safety guidance (observed 2026-09-28)National Gas, emergency contacts and gas safety advice (observed 2026-09-27)nidirect, Northern Ireland Gas Emergency Service advice (updated 17 December 2015; observed 2026-09-27)GOV.UK, Approved Document G (May 2024 amendment; observed 2026-09-25)WaterSafe, customer FAQs on approved plumbing businesses (observed 2026-09-25)Water Regs UK, approved-contractor scheme scope (observed 2026-09-25)

Next steps

Check the source directly before relying on a regulatory detail.
No correction mailbox or form is enabled on this preview.