A roof condition survey is a systematic assessment of the roof's condition, functionality and remaining service life carried out by a professional. The survey covers the roofing material, substructures, penetrations, flashings, the stormwater system and roof safety products. The purpose of the condition survey is to identify damage and risks early so that repair measures can be planned and budgeted proactively. Regular roof condition surveys are the cornerstone of property maintenance. According to the Finnish Real Estate Federation and RT building information card recommendations, the roof condition should be checked visually at least once a year and by a professional every 3–5 years. Preventive maintenance is always more cost-effective than damage repairs — patching a single leak costs hundreds of euros, but rot damage in the roof structure caused by a leak can cost tens of thousands. A condition survey is particularly important in connection with property transactions, when planning a roof renovation and in insurance cases. In many housing companies, the condition survey is a statutory part of the long-term maintenance plan (PTS), and it is also required when applying for renovation grants.
Content of a condition survey
A professional roof condition survey includes several inspection phases. The visual inspection is carried out from the roof: assessing the condition of the roofing material, tightness of seams and joints, firmness of fixings, condition of penetrations and flashings, and integrity of eaves structures. Critical points are specifically checked: chimney base flashings, ventilation pipe penetrations and roof ridges and valleys.
Moisture measurement is the most important instrumental examination of the condition survey. A surface moisture meter (capacitance meter) is used to map the moisture content of the underlayment and roof structure from various points on the roof. Elevated moisture readings reveal leaks and moisture damage that are not visible to the eye. If necessary, drill-hole measurements are made or material samples are taken for more detailed laboratory analysis.
Modern condition surveys often utilise drone photography, which enables safe and comprehensive documentation of the roof. A thermal camera is an effective tool for detecting insulation deficiencies and moisture damage — wet insulation stands out clearly in a thermal image from the surrounding dry material.
Condition survey report and classifications
As a result of the condition survey, the client receives a written report containing a description of the current state, identified damage with photographs, an estimate of the remaining service life and recommendations for repair measures with a timeline. Repair needs are typically classified according to urgency.
The commonly used classification follows the RT 18-11245 instruction card condition assessment scale: 1 = good condition (no actions needed), 2 = satisfactory (maintenance within the next few years), 3 = fair (major renovation within 1–5 years) and 4 = poor (immediate repair needed). This classification helps prioritise repair measures and budget them into the long-term maintenance plan.
The report also includes a cost estimate for the recommended measures. The cost estimate is based on current market prices and the roof area. This is particularly useful for housing companies that need a realistic estimate of future roof investments to support decision-making at the annual general meeting.
Condition survey pricing and commissioning
The price of a roof condition survey varies according to the size and scope of the property. A comprehensive condition survey for a single-family house typically costs 300–800 € including the report. A broader condition survey for a housing company covering all common structures costs 2,000–5,000 €. Many roofing companies offer a free basic-level roof inspection as part of their quotation process.
When commissioning a condition survey, it is worth verifying the assessor's qualifications. A certified building health expert (RTA) or an assessor with FISE certification is a reliable choice. Qualifications can be checked in the FISE Oy competence register. Experience specifically with roofing work is an important additional criterion.
A condition survey is best commissioned in spring or autumn, when any winter damage is visible and weather conditions favour roof inspection. Before the condition survey, it is worth collecting information about the roof's history: installation year, repairs carried out, warranty documents and any observed problems. This background information helps the assessor target the inspection correctly.
Condition survey and property transactions
Roof condition is one of the most significant risk factors in property transactions. A roof renovation is one of the most expensive single renovations for a single-family house — typically 15,000–50,000 € — and an unexpected repair need can come as an unpleasant surprise for the buyer. Therefore, a roof condition survey is recommended as part of the property transaction condition inspection.
The Housing Transactions Act requires the seller to disclose information about the property's condition. If the seller knows the roof is in poor condition but does not disclose this, it constitutes an information error and the buyer can demand a price reduction or even rescission of the sale. A roof condition survey documents the roof's actual condition and protects both seller and buyer in dispute situations.
From the buyer's perspective, a roof condition survey is particularly important when the roof is over 20 years old or shows visible signs of wear. The cost of the survey (300–800 €) is negligible compared to the price of a roof renovation. The survey also provides a negotiating position for a price reduction if repair needs are identified. For the seller, a condition survey demonstrates responsibility and can speed up the transaction.
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Updated: April 2026
