What is a site diary and why should I keep one?

A site diary is a daily record of who was on site, what work was done, any deliveries, the weather, and any decisions, with at least one timestamped photo. It creates bargaining power you cannot recreate later, because the party with better records almost always comes out ahead if a dispute arises.

How often should I visit my extension while it is being built?

A short visit once or twice midweek plus a fixed weekly site walk works well. Being visible matters, but hovering over every mortar joint slows the trades down and a homeowner who never appears is one whose snags get deprioritised.

What should I do if my builder stops turning up?

Occasional gaps are normal in domestic building, but a pattern of declining attendance is not. Raise it in writing immediately, referencing the contract and agreed dates, rather than waiting and hoping, because a quiet site usually means your builder is prioritising another job.

Can my builder change materials or the design without telling me?

No. No change to the approved design should happen without your written agreement, and you should be copied into any technical conversation between your builder and architect or engineer. Unauthorised substitutions can trigger building control issues and expensive rework.

Should I make tea and coffee for my builders?

It costs around £2 a day and matters more than you would expect. Builders talk to each other, and the homeowner who keeps the kettle going and says thanks tends to get better attention than one who treats the site as an inconvenience.

How quickly should I make decisions for my builder?

Aim to answer any decision the builder needs, such as socket heights or tile finishes, within 24 to 48 hours. Indecision from the homeowner causes more delays than most people realise, because a team with no instruction will be sent to another job.

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Phase 2 · Pre-Construction · Task 10 of 13

Managing Your Builder: Communication and Expectations

How to communicate with your builder, keep a site diary, spot warning signs early, handle disputes, and manage the relationship that determines whether your extension succeeds or fails.

20 min readUpdated 2026Premium

Escalation spectrum showing five levels of builder behaviour from normal friction to crisis, with recommended homeowner actions at each stage

Prerequisites

Complete these first

Builders don't stop returning your calls because they're bad people. They stop because they're on another site, they've overpromised their diary, or they're avoiding a conversation about a problem they haven't solved yet. The frustration this causes is real. Community forums are full of homeowners at breaking point because their builder hasn't been on site for a fortnight and won't answer the phone.

But here's what those forums also show: the homeowners who come through it with a finished extension, a reasonable final bill, and their sanity intact are the ones who set up communication rules from day one, kept records, and escalated at the right moment. Not too early (which makes you the difficult client). Not too late (which lets the project drift past recovery).

This is the guide for that. Not the theory of project management. The practical, week-by-week reality of working alongside a builder for six months to a year on the most expensive thing you've done since buying the house.

Do this first

Everything below assumes you've signed a proper contract with a stage payment schedule, as covered in contracts and payment schedules, and verified your builder's insurance, as covered in insurance and liability. If those aren't done, stop here and do them first. It all depends on having a written contract and verified cover.

What this guide covers

01Set the Rules Before a Single Brick Is Laid
02The Site Diary
03The Weekly Rhythm
04The Start Date Problem
05When Your Builder Disappears
06Unauthorised Decisions
07Scope Creep Will Eat Your Budget
08The Weather Excuse
09The Christmas Gap
10Materials Disappearing
11Payment as a Management Tool
12When Things Go Wrong
13The Final 10%
14Building Control Is Your Ally
15Protecting the Relationship

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