How Long Does a Damp Survey Take in Porto?
By Mateo García · Reviewed by Femi Musa · Updated 2026-06-29
Survey timeline from booking to report
Day 0: Phone triage (10 min) — photos and symptom checklist. Day 1–5: On-site visit scheduled. Day 0–2 after visit: Lab review if salt samples taken. Day 5: PDF report with remediation scope delivered.
| Property type | On-site time | Report delivery |
|---|---|---|
| Studio / T0–T1 | 60–75 min | 3 business days |
| T2 apartment | 90 min | 5 business days |
| T3+ / duplex | 2 hours | 5 business days |
| Townhouse + cellar | 2–2.5 hours | 5–7 business days |
| Pre-purchase remote | 90 min + video | 5 business days |
What happens during the on-site block
Minutes 0–15: Walk-through and tenant/owner interview — heating habits, previous treatments, leak history.
Minutes 15–50: Moisture profiling at 100 mm vertical steps on all affected walls. Electrical resistance meter in plaster; reference readings on known-dry upper wall.
Minutes 50–70: External inspection — ground levels, gutters, air bricks, visible cracks.
Minutes 70–90: Thermal imaging on suspect areas; photograph cataloguing; optional carbide sample on disputed walls.
PCA-aligned practice treats the survey as diagnostic, not a sales visit — remediation quote is a separate document (Property Care Association standards, accessed 28 Jun 2026).
What the report contains
Executive summary with primary diagnosis (rise / condensation / leak / combination). Annotated floor plan with moisture values. Photographs keyed to locations. Prioritised remediation steps with EUR bands. Explicit exclusions (e.g., structural engineer referral if crack widening detected).
How to prepare so the surveyor does not waste your 90 minutes
Clear furniture 1 m from affected walls. Provide previous treatment invoices. List known roof or plumbing repairs. Ensure access to cellar and loft hatch if present. Have condominium contact for shared wall permission in advance.
After the survey — decision windows
Purchase diligence: negotiate within CPCV reflection period using report — typically 30 days in Porto resales. Landlord complaints: start remediation within 30 days of tenant notice to preserve habitability defence. Seasonal booking: April–May surveys beat December rush when injection crews book 3 weeks out.
What is in scope vs out of scope on a standard survey
In scope: moisture profiling on interior walls, accessible exterior inspection, thermal imaging on suspect areas, written diagnosis with remediation bands, photograph appendix. Typical duration 90–150 minutes on site.
Out of scope: structural engineer assessment of load-bearing decay, asbestos testing, electrical compliance, full roof inspection beyond visible defects from ground and loft hatch. Referrals listed when we observe crack patterns wider than 2 mm.
RICS building surveys Level 2/3 include broader property condition but shallower damp profiling than a specialist moisture survey. For damp disputes, hire the specialist — not only the general surveyor (RICS guidance, accessed 28 Jun 2026).
Pre-purchase remote buyers: we coordinate agent keys and deliver video call walkthrough — adds 20 minutes on site, same report format.
Equipment we bring to your property
Electrical resistance meter with hammer probe for plaster depths. Pinless mode for comparative scans on large walls.
Thermal camera (FLIR-class) for cold bridge mapping — resolution sufficient to spot missing insulation batts at stud bays.
Hygrometer data loggers left 7 days when condensation is suspected — second visit not charged for logger retrieval on standard survey package.
Carbide speed tester on disputed walls where vendor recently painted — destructive 12 mm powder sample with owner permission.
Salt test strips on heavy efflorescence — distinguishes chlorides (marine) from nitrates (groundwater rise).
How to read the PDF report when it arrives
Page 1 executive summary states primary diagnosis in one sentence — start here. If it says "combined rise and condensation," remediation has two priced work packages.
Annotated plan shows moisture values at each test point. Look for gradient, not single red numbers. Values above 75% WME at base falling to 50% at 1 m support injection; flat 60% across wall suggests hygroscopic salts or uniform condensation.
Remediation table lists priority 1 (urgent), priority 2 (within 6 months), priority 3 (monitor). Budget EUR low-high per line — use for CPCV negotiation or landlord capex planning.
Exclusions page limits liability — if we recommend engineer referral, book one before injecting on timber-frame structures with significant decay.
How to book and what delays to expect
Phone triage: 10 minutes. We ask for photos, postcode parish, property type, symptom duration. Same-week slots available 60% of the time in low season (Mar–May, Sep–Oct).
December bookings slip 5–10 business days due to holiday occupancy and weather access. Survey still valid — but exterior photos may wait for dry facade.
Condominium buildings require elevator reservation in towers — add 15 minutes to on-site time if lift windows are narrow.
Payment: survey fee due on booking confirmation by MB Way or bank transfer. Remediation quoted separately within 3 business days of report delivery unless complex salt poultice lab work extends to 5 days.
Extended answers on survey timing objections
Objection: "Vendor says survey will kill the deal." Response: undisclosed damp kills the deal at license stage when bank valuer finds it anyway — earlier is cheaper. Reflection period exists for this diligence.
Objection: "Surveyor can come next month." Rising damp worsens slowly but salt load increases irreversibly each wet season — delay adds replaster depth, not just calendar time.
Objection: "20-minute contractor visit is enough." PCA-aligned moisture mapping requires minimum 8 test heights per affected wall — 20 minutes allows 2 heights. Insist on written test grid.
Remote buyer time zones: we deliver report PDF by 09:00 WET to match US East Coast evening review windows — scheduling detail that accelerates CPCV decisions.
Same-day express reports available +€90 when flight to sign CPCV departs within 72 hours — limited slots, survey must complete before 14:00.
After survey, remediation mobilisation averages 12 business days in peak October — book injection crew when report drops if winter move-in is fixed.
Integrating survey results with other professionals
Send PDF to structural engineer only when timber decay exceeds 30% cross-section at joist ends — our report flags probe locations to limit engineer time on site.
Architect rehab packages: attach moisture log to licenciamento submission when obra alters ground-floor layout — Câmara increasingly asks about humidity on change-of-use ground floors.
Mortgage valuer: Portuguese bank valuers accept specialist damp report as supplement — reduces down-valuation surprise when tide marks visible in listing photos.
Translator: if CPCV is Portuguese-only, pay certified translation of survey executive summary — €60–€90 — cheaper than misunderstanding scope.
Contractor handoff: remediation quote from surveying firm should reference same test point IDs as report — prevents dispute over which wall was priced.
Follow-up survey after works: optional €180 verification visit at week 8 post-injection — half standard survey fee when we performed original diagnosis.
Survey duration is not shortened for smaller T0 studios — moisture physics same; only report writing shortens. Expect 75 minutes minimum on site.
Bring previous treatment invoices to survey — speeds diagnosis when retracing failed prior work.
Factors that extend or shorten on-site survey time
Furnished cluttered rooms add 15–20 minutes per room — surveyor must access full wall height. Clear before visit per booking email.
Multiple affected walls in large T4+ add 30–45 minutes — each wall needs vertical profile grid minimum 6 points.
Cellar and loft access add 20 minutes each when damp symptoms reference musty smell without visible wall pattern — rule out lateral from below/above.
Tenant occupied with limited English: allow interpreter or WhatsApp voice note follow-up — we add written summary bullets for tenant obligations without extending on-site block.
Rain during survey: exterior photos deferred to dry day add second 15-minute visit — included in standard fee within 5 business days.
Historic buildings with restricted photo zones near protected facades: interior-only documentation may suffice when exterior already documented in prior conservation filing.
Same-day report rush +€90 does not shorten on-site time — only report writing queue. Site time unchanged at 90+ minutes for quality.
Combined purchase survey + damp specialist back-to-back: schedule damp first — general surveyor often lacks carbide kit and misrecords WME on granite.
References
- https://www.property-care.org/ — accessed 28 Jun 2026
- https://www.permagard.co.uk/advice/how-to-treat-rising-damp — accessed 28 Jun 2026
- https://www.rics.org/ — accessed 28 Jun 2026