An Installer Brief: What to Include

An installer brief is a short factual document that tells every bidder the same story about your home, your goal and your constraints, so their prices and methods can be compared fairly. Without one, each installer fills the gaps differently: one assumes easy access, another assumes scaffolding, one prices a premium control and another a basic one, and you end up comparing guesses. A good brief does not need to specify products or prescribe a design; it needs to state what is known, what is unknown, what must not be damaged or disturbed, and what evidence you expect when the work finishes. This guide sets out the headings that make a brief useful, and the traps that make one misleading.

A useful brief has five parts. First, the home: construction type, age band if known, rooms or areas involved, heating and ventilation systems, and anything unusual such as a flat roof, a conservation area or shared walls. Second, the goal in plain terms: warmer rooms, a better certificate outcome, lower running costs, or preparation for a later measure. Third, the known evidence: the certificate, assessment findings and any survey notes, with dates. Fourth, constraints: access, parking, working hours, occupants who work from home, pets, dust sensitivity, and finishes that must be protected. Fifth, expectations: written scope, product data, commissioning, handover demonstration and waste removal. Stating what you do not know is as valuable as stating what you do, because it invites the installer to survey rather than assume.

Before sending the brief, check it for three faults. First, does it prescribe a solution the assessment did not support, such as naming a product size before anyone has sized the system? If so, soften it to a goal and let bidders propose and justify their sizing. Second, does it hide a constraint that will surface on site, like limited loft access or a locked outbuilding? Add it now, since late discoveries become variations. Third, does it ask for the evidence you will need later: scope in writing, product sheets, commissioning records and a handover note? If the brief never asks, the quote will rarely offer. Send the same version to every bidder, note the date sent, and record any bidder questions and your answers so all bidders stay on equal information.

Brief contents should also reflect the jurisdiction of the home. In the UK, a brief for microgeneration work should invite MCS-compliant documentation and handover, and a brief for general retrofit should reference TrustMark expectations on written scope and consumer protection. In EU member states, the brief should ask for whatever national scheme documentation applies, such as installer certification evidence or national quality labels, and should name any national consent or notification step that affects the work. Listed or protected buildings add another layer in both systems: the brief should flag protected status early so bidders can allow for consents and for detailing that preserves historic fabric, rather than discovering the restriction after pricing.

The most damaging brief mistake is copying a neighbour's brief or an online template without checking it against your own home, which bakes in someone else's construction, systems and constraints. Another is writing a brief so vague that it invites wildly different interpretations, then blaming bidders for the spread of prices. A third is the opposite fault: over-specifying products and sizes without an assessment, which locks out better-suited options and transfers design risk to the homeowner. A fourth is forgetting the handover: a brief that never mentions demonstration, documentation or aftercare will produce quotes that omit them. A page of honest facts beats ten pages of borrowed specification every time.

File the final brief with the assessment, the quotes and the comparison table, and carry it into the contract as the description of the job. If the winning bidder proposes changes during the site visit, record them as a revised brief or a written variation, not as a verbal aside. At handover, work through the brief's expectations line by line: scope delivered, products as specified, commissioning complete, controls demonstrated, waste removed, documents handed over. That closing check is what turns a brief from a quoting aid into the spine of the whole job, and it gives any future professional a clear record of what was intended and what was done.