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Construction

The developer who doesn't build

You lay no bricks and you are the one answering to the buyer. Everything others do ends up in your file.

Updated on 13/08/2026

You hire a builder, a design team and half a dozen trades. None of them works for the buyer: **they all work for you, and the buyer knows only you**. That asymmetry sums up the position and explains why a development's file is the hardest on the whole job to complete.

What ends up in your file even though someone else generates it

WhatGenerated byHanded over by
Material and equipment certificatesEach trade**You**
Installation warrantiesEach installer**You**
Use and maintenance manualsThe manufacturers**You**
As-built documentationThe design team**You**

Important

**The only moment all of that can be gathered is before the final payment certificate.** Afterwards, the builder has dismantled the site office, the installer is on another development and the manufacturer has changed sales rep. Holding documentation as a condition of final payment is not distrust: it is the only tool you have, and the whole sector understands it because the same is done to all of them.

What to require by contract, not request at the end

  1. 1

    What documentation each party hands over, listed

    Named item by item. «The usual documentation» is not a list.

  2. 2

    In what format and when

    With the job running, not on completion.

  3. 3

    What share of payment depends on delivering it

    That is what makes it arrive.

  4. 4

    And who reviews it before it is accepted

    Receiving a folder is not the same as checking it is complete.

Watch out

The mistake that costs years later: **accepting the documentation without opening it**. A fat folder arrives at handover, gets filed, and nobody checks whether every trade is inside or only three. When a buyer claims about one particular installation, you will find the gap with the builder already settled. Half a day reviewing it on receipt is worth more than any contract clause.

Worth knowing

What documentation a developer must keep and hand over, what the building manual contains and what statutory warranties apply to the buyer is set by the applicable building rules. **Your adviser or design team settles that**; here we explain how to actually get hold of what must be handed over.

Can I withhold payment over documentation?

If it is in the contract, yes, and it is what makes it arrive. Agree it on signing.

Do I have to give everything to the buyer?

Whatever applies, keeping a copy. Never hand over your only set.

What if something is missing from a trade that no longer exists?

Document what is missing and what you did to get it. That is what holds the position.

A real case

The situation

The handover folder looks complete and three trades are missing from it.

What you do

  1. Reviews the documentation against the list before the final certificate

What you get

The gap surfaces while it can still be demanded.

The situation

A buyer claims about an installation and the builder has already been wound up.

What you do

  1. Requires each trade's documentation by contract during the works

What you get

The file is complete before anyone disappears.

The situation

The contract asked for «the usual documentation» and every trade reads it differently.

What you do

  1. Lists each contract's documentary deliverables one by one

What you get

What is received matches what was asked for, with no interpretation.

The situation

The only set of manuals is handed to the buyer.

What you do

  1. Keeps a copy of everything handed over

What you get

The file survives the handover of the home.

The situation

A trade closes during the works and their documentation is left half-done.

What you do

  1. Documents what is missing, why, and what was done to obtain it

What you get

The gap is explained rather than looking like an oversight.

The situation

The documentation arrives on paper and is boxed up in a storeroom.

What you do

  1. Digitises and stores the file where it can be found years later

What you get

The claim five years from now is answered without emptying the storeroom.

This article answers

  • documentation a developer must hold
  • who hands over the building manual
  • developer liability to the buyer
  • what paperwork to require from the builder