When does a housing company need an external building expert — and how to choose the right one
Sometimes a defect report and a written claim are not enough on their own. When the developer denies the defect, the cause is unclear, or a repair threatens to cost tens of thousands of euros, the housing company needs impartial evidence — and that evidence comes from an independent external building expert. This matters most after the warranty period expires, when the burden of proof shifts to the housing company: at that point, the outcome hinges on who can establish the cause of the defect and attribute liability. The ten-year liability period is counted from the administrative handover (hallinnon luovutus), and once it expires no claims can be brought — not even for latent defects. This guide explains when to hire an expert, which specialist suits which situation, what a statement costs, and how to find a qualified practitioner.
Note: this guide is general in nature and based on Finnish law as a whole — it does not replace personalised legal advice from a lawyer or qualified specialist.
Why an external expert is worth it
The board of a housing company knows its property, but it is not a construction researcher. In a dispute, a bare observation (“there is damp in the wall”) is not enough — you need a determination of what caused the defect and who is responsible. An external expert brings three things a housing company cannot produce on its own:
- Impartiality. An expert with no ties to the developer or the contractor offering repairs carries credibility with the developer, the insurer, and the Consumer Disputes Board (KRIL — Kuluttajariitalautakunta) alike. (KRIL issues non-binding recommendations — ratkaisusuosituksia — not court judgments, but parties generally comply with them.)
- Technical competence and measuring equipment. The true condition of moisture levels, structures, and ventilation can only be established by taking proper measurements and opening up the structure.
- Attribution of liability. A well-written statement distinguishes a construction defect from normal wear or a failure of maintenance — and that distinction is precisely what determines who pays for the repairs.
This is most critical after the warranty period. During the warranty, the presumption of defect protects the housing company, but once the warranty has ended the company must itself demonstrate that what it is dealing with is a latent defect falling within the developer’s ten-year liability. Read more: Warranty period and ten-year liability.
The different types of expert and what each one is for
“Building expert” is not a single profession but a whole family of specialisms. Commissioning the wrong one wastes money and fails to produce the evidence you need. Below are the most common types housing companies call upon, together with the situations where each one adds most value.
| Expert | Area of expertise | When to use them |
|---|---|---|
| Condition assessor / condition investigator | General condition and extent of damage in a structure or property, assessment of repair needs | When the extent or cause of the defect is unclear, before a major repair, or when you need a research-based expert statement |
| Building-health expert (RTA) | Holistic assessment of indoor-air and moisture-damage cases, identification of the health hazard and its cause | Suspected mould or moisture damage, indoor-air problems, occupant health symptoms |
| Moisture surveyor | Precise measurement of moisture content in building structures | Suspected moisture in a wet room or structure, establishing the extent of water damage |
| Structural, HVAC, or electrical engineer | Technical assessment of load-bearing structures, pipework, ventilation, or electrical systems | Cracks, suspected structural inadequacy, ventilation failures, pipe leaks, suspected electrical faults |
| Construction lawyer / solicitor | Legal analysis of liability allocation, the written claim, and the dispute | Warranty or insurance dispute, preventing release of a guarantee, taking the matter to KRIL or the district court |
In practice, more than one specialist is often needed: the condition investigator establishes the defect and its cause, while the lawyer frames the liability claim. In moisture and indoor-air cases, the building-health expert (RTA) is frequently the key figure. Read more about a typical case: Moisture damage in a new dwelling.
When to bring in an expert
An expert is not necessary for every defect. A clear scratch or minor finishing fault during the warranty period can be dealt with through documentation and a written claim, because the burden of proof lies with the developer. Bring in an expert in these situations:
- The cause of the defect or the allocation of liability is disputed. The developer alleges user error; the housing company suspects a construction defect — an impartial investigation resolves the matter.
- The developer denies the defect or evades responsibility. When the conversation stalls, an expert statement shifts the evidential weight to the housing company’s side.
- The warranty period has expired. The burden of proof now rests with the housing company, so the cause of the defect must be demonstrable.
- Before the ten-year liability period closes. If a latent defect is suspected, the cause must be established while the developer is still liable. Bear in mind that a written claim to the developer must also be submitted within a reasonable time of discovering the defect — commissioning an investigation alone does not interrupt the running of the limitation period.
- Before the annual inspection (vuositarkastus, AKL 4:18). The inspection is held approximately 12–15 months after completion. It is in practice the last easy window to formally record defects during the warranty period — an expert can help identify what is worth including.
- A warranty or insurance dispute is under way. The insurer and the guarantee provider typically require research-based evidence.
- Before a costly repair. No major investment should be ordered on the basis of guesswork — an investigation defines the extent of the damage and the correct repair method.
Tip: commission the expert before you open or repair the structure. A repaired defect is destroyed evidence — and that is precisely what the developer may need later. Document and investigate first, repair only afterwards.
A solid starting point is always thorough documentation on your own part: How to document a construction defect correctly. That helps the expert scope the work and saves you money.
What an independent expert statement contains
The value of a statement in a dispute depends on its rigour. A fit-for-purpose expert statement typically includes the following sections:
- Background information and terms of engagement — the property, the client, the scope of the investigation, and the date.
- Observations — what was seen on site, documented with photographs and locations.
- Measurements and samples — moisture readings, structural openings, material samples where required, and measurement records.
- Cause of the defect — a professional assessment of what caused the damage (for example, inadequate waterproofing, incorrect drainage gradient, or a structural fault).
- Proposed repair method — how the defect should be corrected in accordance with good building practice and the applicable regulations.
- Attribution of liability — whether the issue is a construction defect, normal wear and tear, or a failure of maintenance.
It is precisely the sections on cause and attribution of liability that make the statement a tool for dispute resolution: they connect the observation to responsibility. Always attach the statement to your written claim: Making a claim to the developer: how to do it correctly and on time.
What an expert costs — and who pays
The price depends on the scope of the investigation, the size of the property, and the measurements and samples required. The rough order-of-magnitude figures below help frame expectations:
| Service | Indicative price range | What it includes |
|---|---|---|
| Brief inspection / expert statement | approx. a few hundred to one thousand euros | Site visit, visual assessment, short written statement |
| Condition investigation with measurements | approx. one thousand to several thousand euros | Structural openings, moisture measurements, samples, detailed report |
| Extensive indoor-air or damage investigation | several thousand euros | Multi-stage investigation, sampling, laboratory analyses, repair plan |
These figures are indicative — always request a written quote in which the scope of work and the deliverables are clearly specified.
Who pays? As a starting point, the housing company commissions and pays for the investigation. However, if the statement establishes a construction defect falling within the developer’s liability, the housing company may in certain circumstances claim the investigation costs as part of the remedy or damages, if the investigation proved necessary and proportionate — the outcome depends on the contract and how the matter unfolds. Keep the invoices and the statement as evidence and refer to them in your written claim. Legal advice is worth obtaining for this specific question. For more on the basis for allocating costs: What does repairing a construction defect cost — and who pays?.
How to find a qualified expert
Qualifications and independence determine how credible the statement will be. Follow these steps:
- Verify qualifications through FISE. FISE (the Finnish certification body for the built environment) maintains a personnel register for the construction and property sector, listing certified condition investigators, building-health experts, and others. The register lets you confirm that the practitioner holds verified credentials for exactly this type of work.
- Insist on independence. The expert must have no connection to the developer or to any contractor offering to carry out the repairs. Any such tie undermines the evidential value of the statement in a dispute.
- Ask for references. Comparable housing-company and damage-assessment projects demonstrate that the practitioner understands your specific situation.
- Define the engagement in writing. Agree the scope of the investigation, the measurements to be taken, the content of the report, and the timetable in advance, so that you receive exactly what you will need in a dispute.
- Put it out to tender. Request at least two quotes and compare both the price and the scope of work. Competitive tendering is good practice in any case: Housing company tendering: maintenance, renovation, and insurance.
A well-chosen and properly scoped expert rarely turns out to be a pure cost — it is often the single best investment a housing company makes in winning a dispute.
Bring the evidence and liability together in VAREK
An expert statement is just one part of the picture: defect reports, documentation, written claims, deadlines, and the attribution of liability all need to work in concert. VAREK brings them all together — you log the defect with photographs, attach the expert statement and measurement records, identify the correct basis for the claim, and track the deadlines, so that your evidence is complete and up to date when you need it.
Contact us and make sure your housing company’s evidence holds up when it matters most.
This article is intended as general guidance, not legal advice. The specifics of selecting an expert, recovering costs, and allocating liability depend on your contract, the stage of the warranty period, and the individual circumstances of your case — seek advice from a lawyer or a qualified specialist where necessary.
Frequently asked questions
When should a housing company hire an external building expert?
Bring in an expert when the cause of a defect or the allocation of liability is disputed, when the developer denies the defect, or when the warranty period has already expired. An independent statement is also often worth its cost before an expensive repair and before the ten-year liability period closes. For a minor, clear-cut defect during the warranty period, an expert is usually unnecessary.
What does an independent expert statement cost?
A brief inspection or written statement typically costs a few hundred to around a thousand euros; a thorough condition investigation with measurements usually runs from one thousand to several thousand euros. The final price depends on the size of the property, the scope of the investigation, and the measurements and samples required. Always request a written quote that clearly defines the scope of work and the deliverables.
Can the cost of the expert be recovered from the developer?
If the statement establishes a construction defect that falls within the developer's liability, the housing company can generally claim the investigation costs as part of the remedy or damages — provided the investigation was necessary and proportionate. Keep the invoices and the statement carefully as evidence and refer to them in your written claim.
How do I recognise a qualified building expert?
You can verify qualifications through the FISE (Finnish certification body for the built environment) personnel register, which lists certified condition investigators and building-health experts (RTAs), among others. Independence is equally important: the expert must have no connection to the developer or to any contractor offering to carry out the repairs. Ask for references from comparable projects and obtain at least two competing quotes.
Does every defect require an expert statement?
No. A clear, minor defect during the warranty period can often be handled with careful documentation and a written claim alone, because the burden of proof rests with the developer at that stage. Reserve an expert for serious, disputed, or costly defects, and for situations where the allocation of liability is genuinely unclear.