The customer calls.
They explain the problem.
It sounds relatively straightforward.
Then, somewhere in the conversation, you hear:
“We've already had someone out to look at it.”
Sometimes that's completely harmless.
Another tradesperson diagnosed the problem but couldn't return.
The original installer has retired.
The customer has moved into a property where work was completed years ago.
Or they simply want somebody else to continue the project.
Other times, those words are the beginning of a much more complicated job.
Something has already been dismantled.
Parts have been replaced.
Wiring has been altered.
Pipework has been changed.
A temporary repair has become permanent.
Half the original installation is missing.
And the customer understandably just wants someone to make it work.
Taking over previous work isn't automatically something to avoid.
But it does require a different mindset.
Because the moment you touch somebody else's work, there's a risk that their problem gradually becomes associated with your name.
Here's how to approach it.
1. Find Out What Happened Before You Arrive
Start gathering information during the initial enquiry.
Ask:
What was the original problem?
Who has worked on it already?
What did they do?
Did it ever work afterwards?
Why aren't they coming back?
Has anything else been changed since?
You aren't interrogating the customer.
You're trying to understand whether you're attending a normal repair or inheriting an unresolved sequence of previous interventions.
If photographs are useful for your trade, ask for them.
The more complicated the history, the less sensible it may be to promise a solution or price before you've inspected it.
2. Don't Assume the Previous Tradesperson Was Incompetent
This is an important professional habit.
You arrive, look at the work and think:
“Why on earth have they done that?”
Maybe there's a good reason.
Perhaps the customer changed the specification halfway through.
Maybe another person altered the work afterwards.
Perhaps something you're seeing was intended as a temporary measure.
Maybe the previous tradesperson warned the customer about the exact problem you're now looking at.
Or perhaps the work genuinely is poor.
Until you know, don't invent the story.
Explain what you can observe rather than immediately attacking whoever came before you.
“This connection needs further investigation” is more useful than:
“Whoever did this didn't know what they were doing.”
Professionalism still applies when the other professional isn't in the room.
3. Establish the Condition Before You Change Anything
Once you begin dismantling, adjusting or replacing things, the original condition becomes harder to establish.
So document what you inherit where appropriate.
Take photographs.
Record visible damage.
Note missing components.
Document unusual alterations.
Record what the customer tells you has already happened.
For larger remedial jobs, this can become extremely important.
You want to be able to distinguish:
The condition when you arrived
from:
The work you subsequently carried out.
That protects both you and the customer.
4. Diagnose the Current Problem Yourself
The customer may tell you:
“The last person said it needs a new pump.”
That's useful information.
It isn't automatically your diagnosis.
If you're taking responsibility for the next stage, satisfy yourself that the proposed solution is appropriate.
Perhaps the previous diagnosis was correct.
Perhaps circumstances have changed.
Perhaps the customer misunderstood what they were told.
Or perhaps the replaced component was never the underlying problem.
This connects to a principle we've discussed before:
The replacement part shouldn't become the diagnosis.
Inherited work often comes with inherited assumptions.
Test those assumptions before building more work on top of them.
5. Be Clear About What You Can and Cannot Verify
Sometimes you'll be asked to comment on work you can't fully inspect.
The customer might say:
“Can you guarantee everything they've done is okay?”
But you've only seen a small accessible section.
Don't give certainty you don't have.
You can explain:
What you've inspected.
What you've tested.
What you've observed.
What you haven't been able to see.
And whether further investigation would be required.
There's a major difference between:
“I haven't found a problem with the section I've inspected.”
and:
“Everything they've done is fine.”
Precision protects your credibility.
6. Don't Accidentally Take Responsibility for the Entire Installation
This is one of the biggest risks with remedial work.
Imagine you're asked to repair one defective part of a much larger installation.
You repair it successfully.
Three months later, something completely different fails.
The customer remembers:
“But you fixed this.”
From their perspective, you were the last professional involved.
That's why scope matters.
Your quotation, invoice or other documentation should clearly identify what you were engaged to inspect or repair.
For example:
Investigate and repair leak at accessible pipe connection beneath kitchen sink.
That's much clearer than:
Plumbing repair.
The more complicated the inherited system, the more useful accurate scope becomes.
7. Be Careful With Fixed Prices Before Investigation
Inherited work can contain surprises.
A straightforward repair might become:
Undo previous work.
Diagnose the original problem.
Source missing components.
Correct another defect.
Then finally complete the repair you originally expected to do.
Quoting a fixed £150 from a photograph can leave you trapped.
For uncertain remedial work, it may be more appropriate to separate:
Investigation
from
Remedial work.
For example, the first stage may be diagnostic.
Once the problem and condition are understood, you can explain the repair options and price the next stage appropriately.
Customers sometimes resist paying for investigation because they see value only in the physical repair.
Explain what the investigation is achieving.
8. Watch for the Half-Finished Project
Some inherited jobs aren't repairs at all.
They're abandoned projects.
The customer has:
A partially completed bathroom.
Half-finished extension.
Incomplete electrical installation.
Unfinished flooring.
Partially installed heating system.
Or another project somebody else started.
These jobs need careful assessment.
You aren't simply quoting for:
“Finish the remaining 30%.”
You need to establish whether the first 70% is actually suitable to continue from.
If you can't rely on what already exists, completing the project may involve undoing or reworking parts of it.
Explain that before agreeing to simply “finish it off.”
9. Previous Work Can Hide the Original Evidence
This makes fault finding particularly difficult.
Imagine a system originally developed Fault A.
Someone replaced Component B.
Then adjusted Component C.
Then the customer reset something.
Then another person temporarily bypassed Component D.
Now you arrive.
The current symptoms may be very different from the original symptoms.
Each intervention has changed the evidence.
That's why the history matters.
Ask what happened in sequence.
What failed first?
What was changed?
What happened immediately afterwards?
Did the problem improve?
Disappear temporarily?
Become worse?
A timeline can sometimes be more valuable than staring at the latest failed component.
10. Know When Starting Again Is More Sensible
Tradespeople often feel pressure to preserve as much existing work as possible.
Customers understandably don't want to pay twice.
But there are situations where repeatedly patching poor or unsuitable work becomes false economy.
Perhaps the existing installation is fundamentally unsuitable.
Maybe correcting individual defects will cost almost as much as replacement.
Perhaps you can't confidently stand behind the finished result while relying on what already exists.
In those circumstances, explain the options.
For example:
Option A: limited repair to the immediate fault.
Option B: more extensive remedial work.
Option C: replacement or substantial reworking.
Explain the trade-offs rather than simply saying:
“Rip it all out.”
The customer can then understand why the larger option is being proposed.
Don't Promise to “Sort Everything” Before You Know What Everything Is
Customers who have already had a bad experience are often desperate for certainty.
They want the next person to say:
“Don't worry. I'll sort it.”
It's tempting.
But you may not yet know what you're inheriting.
A better promise is about your process, not an unknown outcome.
You can promise to investigate properly.
Explain what you find.
Provide options.
Document what you undertake.
And carry out agreed work professionally.
That's meaningful reassurance without pretending you can see through walls.
Be Sensitive to the Customer's Position
Someone hiring you after a failed or abandoned job may already be:
Frustrated.
Financially stretched.
Suspicious.
Behind schedule.
Living in disruption.
Or worried they'll pay twice for the same work.
That can affect the conversation.
If your quotation is considerably higher than they expected, explain why.
They may mentally calculate:
“There's only one day's work left.”
You may be calculating:
“There's half a day establishing what's been done, another day correcting it, then the original day's work.”
Make the invisible part visible.
Avoid Becoming Part of a Dispute You Know Nothing About
Sometimes the customer isn't merely unhappy with the previous tradesperson.
They're actively disputing the work.
They may ask you:
“Can you write something saying everything they've done is terrible?”
Be careful.
If you're providing an assessment, stick to facts within your competence and what you can actually establish.
Document specific defects you observe.
Don't speculate about:
Why somebody did something.
What they knew.
Whether they deliberately cut corners.
Or contractual matters you weren't involved in.
If a formal expert opinion is required for legal proceedings or another dispute process, that may be very different from an ordinary trade visit and may require someone appropriately experienced in that role.
Don't Automatically Repair Something That Should Be Referred Back
If relatively recent work has developed a problem, sometimes the appropriate first step for the customer is to contact the original business.
That may give them an opportunity to inspect and address it under whatever contractual or warranty arrangements apply.
If you immediately alter the work, it can potentially complicate later discussions about what originally failed.
There will obviously be situations where the original tradesperson is unavailable, unwilling to return or urgent action is required.
But it's worth asking:
“Have you contacted the person who originally did the work?”
before becoming the second person to modify it.
Price the Risk, Not Just the Visible Task
Remedial work can contain more uncertainty than fresh installation.
You may spend longer diagnosing.
Materials may be unpredictable.
Existing work may need correction.
Access may be difficult.
There may be more communication and documentation.
The job might require multiple visits.
That doesn't mean adding arbitrary premiums simply because somebody else worked there first.
It means recognising the actual work involved.
If inherited jobs consistently take twice as long as you estimate, your pricing process needs to learn from that.
Know When to Walk Away
Some inherited jobs simply aren't worth accepting.
Perhaps:
You can't establish what has been done.
The customer refuses to allow proper investigation.
They want you to certify work you haven't inspected.
They're asking you to continue something you consider unsafe.
They insist on a cheap patch you don't believe is appropriate.
The project is outside your competence.
Or they expect you to assume responsibility for somebody else's entire installation.
You don't have to become the final link in every chain.
Sometimes the professional answer is:
“I'm not comfortable taking responsibility for this in its current condition.”
Your Documentation Matters More on Remedial Work
For a straightforward new job, good records are useful.
For inherited work, they can be essential.
Depending on the project, keep appropriate records of:
The initial condition.
Customer-reported history.
Photographs.
Tests or inspections undertaken.
Defects identified.
Recommendations.
Work authorised.
Work completed.
Parts replaced.
Areas not inspected.
And any remaining issues explained to the customer.
Your final invoice can also clearly describe the work actually undertaken.
Six months later, those records may be the only reliable way to reconstruct what happened.
Don't Let Someone Else's Work Define Your Reputation
This is ultimately why inherited jobs need care.
Customers often remember the last person who touched something.
If you repair part of a problematic installation and another unrelated part fails later, your name may still enter the conversation.
You can't eliminate that risk completely.
But you can control how professionally you approach it.
Inspect before assuming.
Document before changing.
Diagnose for yourself.
Define your scope.
Explain uncertainty.
Get additional work authorised.
And don't promise responsibility for things you haven't actually verified.
Taking over somebody else's work can be frustrating.
It can also demonstrate some of the most valuable qualities a skilled tradesperson has: judgement, diagnosis, communication and the ability to bring order to a situation that's already gone wrong.
When you inherit somebody else's work, your first job isn't to criticise what came before—it's to establish exactly what you're taking responsibility for from this point forward.