Defects Liability for Trade Businesses UK 2026 — Retentions, Callbacks and Standing Behind Your Work

What the Defects Liability Period Actually Is

The defects liability period — also called the rectification period or the maintenance period — is a defined window after practical completion during which you are obliged to return and put right any defects in your work at no charge to the client. It is a standard feature of larger and commercial contracts (JCT, NEC and similar standard forms all contain a version of it), and it usually runs for between six and twelve months from practical completion, though twelve months is the most common on building work.

The point of the period is not to give the client a free improvement window. It exists so that defects which only show up once the building is in use — a seal that fails in the first hard frost, a hairline crack that opens as the structure settles, a valve that weeps under real-world load — can be identified and fixed before final accounts are settled. At the end of the period the contract administrator typically issues a certificate of making good, which confirms the defects have been remedied and unlocks the final tranche of your money.

Retention Money — How It Works and How to Get It Back

Retention is a percentage of the contract value that the client holds back as security against defects. It is standard practice on contract and commercial work, and increasingly appears on larger domestic jobs run through a main contractor. Typical retention is 2.5% to 5% of each payment. The mechanics matter, because retention is where trades most often lose money they have already earned.

The conventional release schedule splits the retained sum in two. Half is released at practical completion — when the work is finished and the building is usable — and the other half is released at the end of the defects liability period, once the certificate of making good is issued. So on a £40,000 contract with 5% retention, £2,000 is held back; £1,000 should come to you at practical completion and the final £1,000 at the end of the defects period, often a year later.

That final £1,000 is pure profit sitting in someone else's account, and it does not chase itself. Diary the release date the moment the contract is signed, not when you remember. The defects period end date is fixed by your practical completion certificate, so you can calculate it in advance. When the date passes, issue your retention release application promptly, attach the certificate of making good (or chase the contract administrator to issue it), and follow up in writing. Retention left unclaimed is one of the biggest silent leaks in a small firm's cash position.

Retention Release Timeline

Genuine Defect vs Chargeable Work vs Fair Wear and Tear

The single most important operational skill in defects handling is drawing the line correctly. A genuine defect is something that was not done to the standard agreed — faulty workmanship, a material that has failed prematurely, an installation that does not perform as specified. You fix those for free; that is what the defects period is for. But a great many callbacks are not defects at all, and fixing them for free trains clients to treat you as a free maintenance service.

New work is anything the client now wants that was not in the original scope — a different finish, an extra socket, a change of layout, damage they caused themselves. That is chargeable, and you should quote it like any other job. Fair wear and tear is the natural deterioration of materials in normal use: silicone that needs renewing after a few years, a gate that needs re-hanging after seasonal movement, sealant around a bath that has aged. None of that is your liability, and the defects period does not cover it.

Worked Examples — Where the Line Falls

Handling Callbacks Efficiently

How you handle the callback phone call matters as much as the fix itself. The client who rings is, in that moment, anxious and possibly annoyed — and the speed and tone of your response shapes whether they leave a five-star review or warn their neighbours off you. The goal is to respond quickly, diagnose accurately, and either fix it fast or set a clear, honest expectation about when you will.

A simple operational process keeps callbacks from eating your margins:

• Log every callback the moment it comes in — client, job reference, what they're reporting, and the date. A callback you forget is a reputation you lose.
• Ask for a photo or video first where possible. Many callbacks can be diagnosed — and some resolved over the phone — without a visit, saving you a wasted trip.
• Classify before you commit. Decide whether it is a defect, new work or wear and tear before you promise anything free.
• Batch callback visits into a fixed slot in your week rather than dropping live jobs to chase every one. A reliable "I'll be there Thursday" beats an unreliable "I'll try to pop by".
• Close the loop in writing once it's done — confirm what you did and that the matter is resolved.

Track your callback rate as a number. If a particular material, sub-contractor or detail keeps generating callbacks, that is data telling you to change something. A trade that knows its callback rate by job type can price defects risk into quotes instead of absorbing it blind.

Warranties and Guarantees

A defects liability period is a contractual mechanism; a warranty is a promise you make about how long your work or the materials will last. The two are related but not the same, and clients routinely confuse them. Be clear in your own paperwork about what you offer. A typical structure is a workmanship guarantee — say, twelve months or two years on your labour — sitting alongside the manufacturer's warranty on the products you install, which you pass through but do not personally underwrite.

Manufacturer warranties usually depend on the product being installed to specification, so keep proof that you followed the instructions. For insurance-backed guarantees and longer warranties (common in roofing, damp-proofing and windows), register the work promptly and give the client their certificate — an unregistered guarantee is worthless when they come to sell the house and the surveyor asks for it. Make the warranty terms part of your quote and your completion paperwork so there is never a dispute about what was promised.

The Legal Backdrop You Need to Know

Even on a domestic job with no formal contract and no defects period, you are not off the hook the moment you're paid. Two pieces of law set the backdrop, and understanding them stops you from giving away free work you don't owe — or refusing work you do.

Under the Consumer Rights Act 2015, any service supplied to a consumer must be carried out with reasonable care and skill. If your work falls below that standard, the client is entitled to have it put right, and you can be required to redo it or to reduce the price. This applies regardless of whether you offered a guarantee — it is a baseline legal duty, not an optional extra. It is also why your defence in a genuine dispute is evidence that the work was done properly, not the absence of a complaint.

Separately, the six-year limitation period for breach of contract (under the Limitation Act 1980) means a client can generally bring a claim about defective work for up to six years from the breach — twelve years if the contract was executed as a deed. That is a long tail of potential liability, and it is the reason your records need to outlive the job by years, not weeks. None of this should make you fearful; it should make you methodical.

Records and Photos That Protect You

In a defects dispute, the trade with the better records almost always wins. Memory is not evidence; dated photographs and written records are. Build the habit of documenting every job as you go, not as an afterthought when a problem lands.

• Before, during and after photos of every job, time-stamped. The before shots prove the condition you inherited; the during shots prove what was concealed; the after shots prove the standard you left.
• Signed sign-off at completion — even a photo of the client acknowledging the work is satisfactory closes off later claims that it never was.
• Material records and batch details so that if a product fails you can pursue the manufacturer rather than carry the cost.
• Written scope and variations so the line between original work and chargeable extras is never a matter of opinion.
• A log of every callback and what was done — this is what proves you stood behind your work if it ever reaches a formal complaint.

Keep all of this for at least six years to cover the limitation period. Storing it against the job record — rather than in a phone's camera roll that gets wiped or lost — is the difference between a five-minute response to a complaint and a frantic search through old messages.

Why Good Defects Handling Drives Reviews and Repeat Work

Here is the part most trades miss: the callback is not a cost centre, it is a reputation event. Almost anyone can do good work on a smooth job. What separates a firm clients recommend from one they merely tolerate is how it behaves when something goes wrong after the money has been paid. A trade that answers the phone, turns up when it said it would, and fixes a genuine defect without quibbling earns the kind of loyalty that no marketing budget can buy.

That loyalty is measurable. The client whose leak you sorted promptly is the client who leaves the review, refers the neighbour, and calls you first next time rather than getting three quotes. Handling defects well is one of the cheapest forms of business development available to a small firm — you are already in the relationship, and a good resolution compounds it. Handling them badly, by contrast, is how a single job turns into a one-star review that costs you ten future enquiries.

Putting It Into Practice

Defects liability is not paperwork for paperwork's sake — it is the system that protects your cash, your time and your name. Diary your retention release dates so the final tranche never slips through the cracks. Build a clear, fast process for triaging callbacks and classifying them honestly. Document every job as you go so that, six years on, the evidence still speaks for you. Be generous with the genuine defects and firm on the chargeable ones, and make the distinction obvious to the client in writing before any argument can start.

Do that consistently and the post-completion phase stops being a source of dread and unpaid hours. It becomes what it should be: the part of the job where you prove the work was worth the price, collect the money you're owed, and earn the next job before anyone else gets a look in.