Written Down or Not at All: Managing Mid-Build Variations on Three Counties Projects

There is a moment on almost every renovation when a homeowner, standing in a half-stripped room, says something like: "While you're here, could you just..." The request is usually reasonable. The problem is not the request itself but the fact that it is made, agreed and forgotten in the space of ninety seconds. Six weeks later it reappears on the final invoice, unpriced, unbudgeted and difficult to argue with.

Variations are not a sign that a project is going wrong. On older properties in Herefordshire, Worcestershire and Gloucestershire they are close to inevitable, because the fabric of a building rarely reveals itself until it is opened up. What separates a controlled project from a drifting one is not the absence of extras but the discipline applied to them.

Why verbal extras are the weak point

A written quotation, however detailed, describes a known scope. A verbal instruction describes an intention. Between the two sits everything that causes disputes: how much, how long, who supplies the materials, and whether the work replaces something already priced or adds to it.

Homeowners often hesitate to ask for paperwork on a small extra, fearing it will seem mistrustful or slow the job down. In practice the opposite is true. A builder who prices variations in writing is usually a builder who understands his own costs, and a request for a written figure is far less awkward than a disagreement at handover.

The four triggers we see most often

Across the three counties, the same categories of variation recur.

Latent defects. Damp behind plaster, failed lintels, rotten joist ends or a chimney flue in worse condition than the survey suggested. Solid-walled cottages and older farmhouses are particularly prone to this, and a thorough pre-start investigation reduces but never eliminates the risk.

Service alterations. Sockets, radiators or downlights that no longer sit where they should once walls are moved, or that a homeowner wants relocated after seeing the room laid out. Small individually, cumulative in number.

Specification upgrades. Insulation exceeding Building Regulations minima, a higher-spec glazing unit, or a flooring upgrade once the original allowance is understood. These are choices rather than surprises, and they should be priced as such.

Late material substitution. A specified slate, brick or render that is unavailable, discontinued or subject to a long lead time. The substitution may be perfectly sensible, but it still changes the cost and should be evidenced.

A four-step protocol for pricing any variation

First, ask for the request to be recorded before work proceeds. A short email or a note in the site diary is sufficient: what is proposed, where, and why. If the builder has raised it, the same applies in reverse.

Second, insist on a written price before authorisation. One page is enough, provided it states the description of the work, the cost, the effect on the programme, and whether any previously priced item is being removed. A variation that deletes work should produce a credit, and that credit is easily overlooked if the scope change is not described precisely.

Third, decide promptly and in writing. Delays in approving a variation are frequently more expensive than the variation itself, because trades are held or resequenced. Reply with a clear instruction, even if it is a refusal.

Fourth, confirm that the priced figure has been added to the running total. A variation approved but never logged is functionally the same as one never agreed.

Comparing an extra against the original schedule

A variation should never be assessed in isolation. Before approving, check it against the priced schedule or quotation. Three questions are worth asking every time: does this work already appear somewhere in the original scope, has an allowance already been made for it, and does it overlap with a provisional sum?

Provisional sums deserve particular attention. They exist precisely for work that cannot be defined at tender stage, and they are not extras. If a provisional sum of £4,000 was included for damp remediation and the eventual cost is £5,200, the variation is £1,200, not £5,200. Conflating the two is one of the most common causes of an inflated final account.

Keeping a running total

A single cumulative figure, updated as each variation is agreed, is the most useful number on any renovation. It converts a series of individual decisions into a position the homeowner can actually see, and it exposes the point at which the contingency is being consumed.

Set a threshold in advance. Many homeowners find it helpful to agree that any single variation above a stated sum, or any cumulative total beyond an agreed percentage of the contract value, triggers a review conversation before further approvals are given. This is not adversarial; it is simply good governance, and reputable builders generally welcome it.

A one-page variation log

The document below can be kept in a spreadsheet or printed and clipped to the contract file. It requires no software and takes a minute to update.

Ref	Date raised	Description of change	Raised by	Original scope affected	Priced sum	Credit due	Net cost	Programme impact	Status	Date approved
V01
V02

Two columns carry more weight than they appear to. "Original scope affected" prevents double counting, and "credit due" ensures that omitted work is returned to the homeowner rather than quietly absorbed into the overall figure. A running total at the foot of the page, alongside the remaining contingency, completes the picture.

Closing the final account

At practical completion, reconcile the variation log against the builder's final account line by line. Anything on the invoice that does not correspond to a logged and approved variation should be queried in writing before the retention is released. Equally, any logged credit should be confirmed as applied.

This reconciliation takes perhaps an hour. It is the cheapest hour in the entire project, and it is the one most often skipped. Homeowners eager to see the scaffolding down frequently accept a final figure that has never been checked against the paperwork.

A note on tone

A variation protocol is not an accusation. It is a shared method for keeping a complex job understandable to both parties, and most builders working across the three counties will happily adopt one if it is proposed at the outset rather than halfway through. Raise it at contract stage, agree the format, and the conversation about extras becomes a routine administrative step rather than a negotiation conducted under pressure.