What you promise about the work after it has been delivered

There is always a promise, whether or not you made one

Small businesses often assume that if nothing was said about what happens when work fails, then nothing was promised. That is almost never the position. Most countries imply some standard into a sale — that the work will be carried out with reasonable care, that goods will be as described and fit for their purpose — and those implied terms operate regardless of anybody’s intentions.

So the question is not whether to give a guarantee. It is whether the obligation you already carry is described in a document you wrote, or left to be reconstructed later by two people with different memories and opposing interests.

The rules set a floor, and it cannot be argued away

The extent to which a supplier can limit their responsibility varies by country, and it commonly varies further depending on whether the buyer is a consumer or another business. Attempts to exclude obligations beyond what is permitted tend to be ineffective rather than merely frowned upon, which means a fierce-sounding clause can be worth nothing at all.

That makes this an area where a general article can only describe the shape. What applies to your trade, in your country, with your kind of customer, is a question for somebody qualified locally — and it is worth asking once, early, because the answer shapes what your terms should say.

Three remedies, and they aren’t equivalent

Putting something right generally means one of three things: repairing or redoing it, replacing it, or returning the money. From the supplier’s side these cost wildly different amounts, and the order in which they are offered matters.

Redoing the work costs your time and usually preserves the relationship. Replacement costs materials as well. A refund costs the whole fee and, in a small business, the fee has often already been spent on the materials and the hours that produced the thing being refunded. It is entirely normal to say which remedy applies first, provided that is consistent with whatever the local rules require.

Bound it: what, how long, and what is excluded

A useful promise answers three questions. What is covered — the workmanship, the materials, both. For how long. And what is not included, which is usually ordinary wear, misuse, changes made by somebody else afterwards, and anything caused by materials or instructions the client supplied.

The exclusions are the part that protects you and the part everybody leaves out. A supplier who has not excluded later modifications will eventually be asked to put right something a third party broke, and will have no written basis for declining. Being specific here is not distrust; it is the difference between a promise you can keep and one that expands to whatever the client hoped for.

Promising more than required can be worth it

A guarantee beyond the minimum is a genuine selling point, particularly where buyers cannot judge the work in advance and are choosing between suppliers who all look plausible. It signals confidence in a way that claims about quality cannot.

It also has a cost that should be estimated rather than assumed to be zero. Look at how often work has actually needed putting right, and what it took, before extending a promise across a longer period. A guarantee is a liability the business carries silently, and for a one-person operation the relevant question is what would happen if several claims arrived in the same month.

When something does go wrong

The response that costs least is almost always the quick one. Establishing what actually happened, saying what you will do and doing it promptly converts a failure into evidence that you are reliable, which is a better outcome than the job going perfectly would have produced.

What costs most is delay, argument about whether it’s covered, and a remedy offered grudgingly in stages. That sequence turns a modest repair into a dispute about the whole engagement, and disputes are settled on the basis of documents and impressions rather than on who was originally right.

It is worth keeping a note of every claim, however minor: what failed, why, what it cost to put right and how long after delivery it appeared. Two years of that turns the guarantee from a guess into something you can price, and it tends to identify one recurring fault that is generating most of the work. Fixing that fault at source is nearly always cheaper than continuing to remedy it one job at a time.