How to price a variation on a commercial landscape contract

What counts as a variation?

A variation is a change to the work you originally contracted to do: an addition, a deletion, or a change in how something is to be carried out, directed or caused after the contract was set. On a commercial landscape job that might be a change of plant species, an extra area of paving, a different soil depth, or a redesign that lands after you have started.

The test that matters is whether the work sits outside your original scope. If it was already in the drawings and specification you priced, it is not a variation, no matter how much extra effort it turned out to take. This is the first place claims fall over: work that felt like extra but was actually included in the scope you signed up to. Knowing exactly what your original scope covered is what lets you tell the difference.

Is the variation claimable?

A variation is generally claimable when three things are true: the work is outside your original scope, the change was directed or caused by the principal or head contractor rather than by you, and the contract permits a claim for it. Miss any one of those and the claim is weak, however real the extra work felt on site.

The contract is the deciding document here, so read what it actually says about variations before you rely on a claim. Contracts set out how variations must be directed, priced and notified, and those terms govern what you can recover. General guidance like this article tells you how the process works; only your specific contract tells you whether a given variation is claimable and on what terms. When the wording is onerous or unclear, that is worth checking at scope and contract review stage rather than discovering it mid-job.

Notice: the step that decides most claims

Notice is the single most important step, and the one most often missed. Most contracts require you to give written notice of a variation within a set time, and a claim submitted late can be barred outright regardless of its merit. A genuine, well-priced variation can be lost entirely because notice went in a week too late.

Give written notice as soon as a variation arises, within the time the contract requires, and before you do the work wherever possible. Doing directed extra work first and pricing it later weakens your position and risks doing it for nothing. The order that protects you is notice first, agreement second, work third, unless the contract or a genuine site emergency forces otherwise. Treat the notice clause as a deadline as hard as the tender's.

How to price the variation

Price a variation with the same discipline as the original tender: take off the changed quantities, apply the correct rates, and add the costs the change actually causes. It is just as easy to lose money on an underpriced variation as on an underpriced bid, and variations are often priced in a hurry on site, which is exactly when items get missed.

A complete variation price usually has to account for:

• Changed quantities — measured, not estimated from memory.
• Rates — the schedule rates the contract specifies, or current supply and labour rates where it does not.
• Time-related cost — extra supervision, plant standing, or delay the change causes.
• Knock-on effects — work already done that has to be undone or reworked.
• Margin — applied as the contract allows, not left out because it is only a variation.

The time-related and knock-on costs are the ones most often left out. A change that looks small in materials can carry real cost in disruption, and a variation priced on materials alone quietly gives that cost away.

How to document the claim

Documentation is what turns a valid variation into a paid one. Set out the claim in a single clear submission that a busy contract administrator can approve without having to chase you for the basis of it. The easier you make it to say yes, the faster and more often you get paid.

A well-documented variation claim shows:

1. The cause: what changed, who directed it, and when.
2. The scope of the change, tied back to the original contract scope.
3. The quantities taken off, with the drawings or markups they came from.
4. The rates applied and where they come from.
5. The supporting records: instructions, site records, photos and dates.

Keep a variations register alongside the individual claims, so nothing is forgotten and you can see at a glance what has been submitted, approved and paid. On a job with many small changes, the register is often what stops several claimable variations quietly slipping through unclaimed.

Why variation claims get knocked back

Most rejected variation claims fail on process, not merit. The work was real and the cost was fair, but the claim went in late, or lacked the records to prove its cause, or turned out to cover work that was in the original scope all along. These are avoidable failures, and they are where landscapers lose the most money after winning a job.

The pattern behind all three is the same: a strong claim undone by weak process. Timely notice, a clear tie back to the original scope, and records that support the cause and the cost are what get a valid variation approved. The discipline that wins the tender in the first place, an accurate takeoff and clear documentation, is the same discipline that gets the variation paid.

Frequently asked questions

What makes a variation claimable?

A variation is generally claimable when the work is outside the original scope, the change was directed or caused by the principal or head contractor, and the contract permits a claim for it. If the work was already included in your scope, it is not a variation, no matter how much extra effort it took.

How do you price a variation?

Take off the changed quantities, apply the rates the contract specifies or your current supply and labour rates, and add any time-related cost and margin. Price a variation with the same discipline as the original tender, because it is just as easy to lose money on an underpriced variation as on an underpriced bid.

Why do variation claims get rejected?

Most rejected claims fail on notice or documentation, not on the merits. Common reasons are late notice outside the contract time bar, work that was actually in the original scope, and claims with no records to support the cause or the cost. Clear, timely documentation is what gets a valid variation paid.

Should you do variation work before it is approved?

Wherever possible, no. Doing directed extra work before the variation is priced and agreed weakens your position and risks doing it for nothing. Give written notice and get the variation confirmed before proceeding, unless the contract or a genuine site emergency requires otherwise.

Key takeaways

• A variation is work outside your original scope; if it was in the scope you priced, it is not claimable.
• Notice is the step that decides most claims: give written notice within the contract time, before doing the work.
• Price variations with tender discipline, including time-related and knock-on costs, not materials alone.
• Document each claim with its cause, scope, quantities, rates and records, and keep a variations register.
• Most rejected claims fail on process, not merit, so timely notice and clear records are what get you paid.