Heat loss
How heat loss calculations work in UK homes
A plain-English explanation of inputs, assumptions, room-by-room results, and the checks that matter before system sizing.
Resources
Guides and Articles
Practical guidance for installer teams dealing with heat pump surveys, planning, BUS evidence, heat loss calculations, RdSAP 10, and related standards. Use the evergreen guides first, then the dated updates where timing matters.
Evergreen guides
Core pages that stay useful after the headlines move on
Planning
Heat pump planning permission guide
An England-focused guide to permitted development, common planning triggers, and the evidence that helps before promises are made on site.
Survey packs
What an ASHP survey pack needs before design starts
A practical checklist of the room, electrics, emitter, cylinder, and external details that stop design from chasing the site twice.
Solar
Plug-in solar vs rooftop solar
Where the products overlap, where they do not, and why rooftop design still depends on proper site evidence.
Standards and policy updates
Dated pages checked against the current source material
These pieces are useful because they state their dates and sources clearly. Where the rules move, the pages say so.
BUS
BUS changes from April 2026
What the draft Ofgem guidance changes, what it does not change, and what survey evidence still matters before a quote goes out.
EPC
Do you still need an EPC for a heat pump grant in 2026?
A short explainer on what the draft BUS update changes at application stage and what evidence still needs checking in the survey.
RdSAP 10
RdSAP 10 evidence requirements
What changed in evidence expectations, why assessors now need better documentary support, and what households or installers can gather early.
MCS 020(a)
MCS 020(a) sound calculations
A practical reading of the current sound rules, where they matter in survey work, and what should be checked before permitted development is assumed.
Future Homes Standard
Future Homes Standard: heat pumps and solar
What is confirmed for new-build heating and generation, what is still programme direction, and what it signals for retrofit by comparison.
Warm Homes Plan
Warm Homes Plan 2026
A source-backed summary of the plan, the funding routes it points to, and what it means for homeowners, installers, and landlords.
Historical notes
Pages kept for context, not for first-time reading
Some date-led posts remain live for reference but are noindexed because they are snapshots, not the best page to rank for the topic. Where a stronger guide exists, that is the page featured above.
Archive note
BUS statistics update
A dated snapshot kept live for reference, with the main BUS guide carrying the current interpretation.
Archive note
Record clean power auction
A policy-era snapshot that stays available for context but is not the main page for first-time readers.
Archive note
Public sector clean energy fund
A narrower funding update kept available for reference while broader guides handle the main topic.