My House Survey Says Further Investigation Is Needed - What Does That Mean?

If your house survey says that something needs further investigation, it does not automatically mean the surveyor has found a serious hidden defect or that you now need to pay for another full survey.

Usually, it means there is an important uncertainty that could not be resolved within the normal scope of the inspection. A useful recommendation should make four things clear: what remains unknown, why that matters, who is best placed to investigate it and whether you need the answer before you exchange contracts.

The phrase can sound frustrating when you have already paid for a survey, but used properly it is there to protect you from making a decision with a material gap in the information.

Why would a surveyor recommend further investigation?

A Home Survey is a visual, non-invasive inspection. The surveyor will inspect accessible areas and use professional judgement, but they cannot open up every wall, lift fixed floor finishes, dismantle services or carry out every specialist test.

The inspection level also matters. A Level 2 and Level 3 Home Survey do not provide exactly the same depth of inspection and analysis, although neither is a destructive investigation.

RICS recognises that there will be occasions where a surveyor cannot reach a conclusion with reasonable confidence and further investigation is appropriate. The important point is that the recommendation should be proportionate to the risk and the missing information rather than a generic list of tests “just in case”. You can see the RICS Home Survey framework and sample documents on the RICS Home Surveys page.

What should a good further-investigation recommendation tell you?

When I read a recommendation for further investigation, I would want to be able to answer four questions.

1. What is not known?

The report should identify the point the surveyor could not establish. For example, the condition of concealed roof timbers, whether structural movement is ongoing, the cause of localised dampness, or the safety of an electrical installation where there is no current test information.

2. Why does the answer matter?

The uncertainty should be relevant to your decision. If the possible outcome could involve significant repair cost, safety, structural work, mortgageability or disruption, resolving it before you are legally committed may be sensible.

3. Who should investigate it?

The right person depends on the question. A structural engineer, electrician, Gas Safe engineer, drainage contractor and roofing contractor all answer very different questions. “Get a specialist” is much less helpful than identifying the type of expertise actually required.

4. When do you need the answer?

Some issues can sensibly be dealt with as normal maintenance after purchase. Others could materially affect whether you proceed or the price you are prepared to pay. The report should help you understand that difference.

Common examples of further investigation after a house survey

The exact recommendation will depend on the property, but these are common situations where additional information can be justified.

Electrical installations

A surveyor does not carry out an Electrical Installation Condition Report as part of a normal Home Survey. If there is no recent test information, the installation appears dated, or visible concerns are identified, an inspection by a suitably qualified electrician may be recommended.

The question is not simply “Is there a certificate?” It is whether the condition and safety of the installation can be understood well enough for you to make an informed purchase decision.

Gas and heating

Similarly, a Home Survey does not replace specialist gas-safety or boiler testing. Depending on the information available and what is seen during the inspection, the report may recommend checking servicing or obtaining specialist advice.

Drainage

Inspection of accessible drainage can identify some defects, but it will not always establish the condition of buried pipework. If there are signs of blockage, leakage, movement or other concerns, a CCTV drainage survey can sometimes answer a specific question that a visual property inspection cannot.

Roofs and concealed structure

Roof spaces can be restricted by stored belongings, insulation, boarded areas, low headroom or inaccessible sections. The external roof can also have areas that cannot be safely seen. If the concealed area is important to understanding a suspected defect, further access or specialist inspection may be needed.

Cracking or possible movement

Many cracks can be assessed from their pattern, position and surrounding evidence. In other cases, the surveyor may need a structural engineer to establish whether movement is ongoing, whether a previous alteration is adequately supported, or whether further monitoring is necessary.

Damp where the cause is uncertain

A high moisture reading on its own should not automatically lead to a generic damp-proofing recommendation. The building needs to be considered as a whole. If the source or extent cannot be established during the survey and the uncertainty is material, a targeted further investigation may be sensible.

Does further investigation need to happen before exchange?

Sometimes yes, sometimes no.

The practical test is whether the missing information could materially change your decision to buy, the price you are prepared to pay, the amount of work you are taking on or your ability to insure or finance the property.

If it could, I would normally want the uncertainty resolved before you become legally committed.

If the recommendation relates to routine maintenance, future servicing or a modest issue that you already understand and can budget for, it may not need to delay the transaction.

The surveyor should help you understand the urgency. Your conveyancer can then advise you on the legal timing of exchange and any enquiries or documents that need to be dealt with through the legal process.

Who should arrange and pay for further investigation?

There is no single rule.

A buyer may arrange and pay for a specialist inspection because they want independent information before proceeding. In other cases, a seller may already hold recent reports, certificates, guarantees or invoices that answer the question without another inspection.

Occasionally a seller may agree to arrange a check, particularly where access is easier for them to organise. What matters is that you are comfortable with the independence, scope and quality of the information you rely on.

If the investigation could lead to significant negotiation, I would be cautious about relying on a vague verbal reassurance. Written findings are much more useful.

What if the survey recommendation is vague?

If your report simply says “specialist advice recommended” and you cannot tell what the specialist is meant to establish, ask your surveyor.

A useful recommendation should not leave you arranging expensive investigations without understanding the purpose.

Questions you can ask include:

·        What exactly could you not determine?

·        What outcome are we trying to rule in or rule out?

·        Who is the right person to do that?

·        Is this something you think I should resolve before exchange?

·        If the result is adverse, what could that mean for the property?

A short conversation can often turn a vague-looking recommendation into a clear next step.

How does my solicitor or conveyancer fit into this?

Some “further information” is legal or documentary rather than technical.

For example, your survey may identify an extension, replacement windows, alterations, a guarantee, a leasehold responsibility or a shared drainage arrangement that your legal adviser needs to investigate.

The surveyor should flag the issue and explain why it matters from a property perspective. Your conveyancer then deals with title, approvals, contracts, rights, guarantees and other legal documentation.

Keeping those roles separate avoids paying the wrong professional to answer the wrong question.

Frequently asked questions about further investigation

Does further investigation mean the survey has failed?

No. A good survey should identify its limitations and tell you when an unresolved point is important enough to need more information. The problem is not that further investigation is sometimes necessary; it is when recommendations are vague, disproportionate or unexplained.

Can I renegotiate before the further investigation is complete?

You can raise concerns, but if the likely cost or seriousness is still unknown, negotiation can be difficult to evidence. Where the uncertainty is material, getting the right information first usually puts you in a much stronger position.

What if the seller refuses access for further checks?

You then have to decide whether you are comfortable proceeding with the uncertainty. Speak to your surveyor about the technical risk and your conveyancer about the transaction. Refused access does not automatically mean there is a hidden problem, but it does leave the unanswered question unresolved.

Further investigation should answer a specific question

The phrase should not be a catch-all disclaimer.

Used properly, it means: there is something important we do not yet know, here is why it matters, and here is the most proportionate way to find out.

At JWA Surveyors, I aim to keep further-investigation recommendations targeted and explain why they are needed. Clients can also speak to me after the report so that the next step is clear. If you are choosing a survey for a property and are unsure which level is appropriate, you can use the Which Survey guide or get in touch.