Short answer: look for a pattern rather than one stain: suspect sealant, rippling panels, soft materials, swollen cabinetry, corrosion, water tracks and musty odours around roof edges, openings, corners and plumbing. Recent paint, trim or heavy resealing may hide earlier damage. A visual check cannot prove the structure is dry or sound, and one moisture reading is not a guarantee. Pause the purchase when evidence conflicts and use a suitably experienced independent inspector.
Why water damage needs a buyer-focused check
Caravan water entry can affect finishes, timber or composite materials, fasteners, insulation and concealed framing. Dry weather on inspection day may hide an active leak. A previous leak may also have been sealed without the damaged material being removed or the cause properly documented.
This is different from routine owner maintenance. The goal before purchase is not to reseal the caravan yourself; it is to decide whether the condition, repair history and remaining uncertainty are acceptable at the agreed price.
Start outside, from ground level
Inspect in good daylight without climbing onto the roof or crawling under an unsupported caravan. Use binoculars or ask the seller to provide current roof photographs if roof areas cannot be viewed safely. Look around:
- roof edges, front and rear corners
- windows, doors and external hatches
- roof vents, air conditioners, antennas and solar cable entries
- awning mounts, marker lights and body penetrations
- horizontal and vertical body joints
- shower, hot-water, water-filler and plumbing outlets.
Warning signs include cracked, separated, missing or heavily layered sealant; gaps at corners; loose mouldings; buckled or rippled cladding; bubbling; stains below fittings; corroded screws; and mismatched panels. Fresh sealant is not automatically bad, but ask what was done, why, by whom and whether the underlying materials were checked.
Follow the evidence inside
Water often travels before it becomes visible. Compare the interior location with nearby roof joints, windows, corner mouldings and exterior fittings. Open cupboards and storage spaces with the seller’s permission. Pay attention to:
- ceiling and wall discolouration, ripples, bubbles or repaired patches
- soft, spongy or uneven wall, ceiling and floor areas
- swollen cabinet edges, lifting laminate and distorted trims
- rusted staples, screws, hinges or appliance surrounds
- water tracks beneath windows, hatches and cable entries
- musty, earthy or persistent deodoriser smells
- mould-like spotting, especially in corners and enclosed spaces.
Do not press hard, remove panels, drill holes or carry out destructive testing. Flooring can be damaged by footwear, furniture loads or previous repairs as well as water. A soft area is a reason to investigate—not a remote diagnosis.
Check high-risk internal zones
| Zone | Evidence to look for | Question to ask |
|---|---|---|
| Front and rear corners | Staining, loose trim, swollen cabinetry, corrosion, repaired lining. | Have corner or roof-edge leaks been repaired? |
| Windows and hatches | Water tracks, damaged seals, dark fasteners, bubbling wall finish. | When were seals inspected or replaced? |
| Under beds and seats | Musty odour, damp items, hidden staining, altered framing. | Can storage be emptied for inspection? |
| Shower and toilet | Failed joints, movement, swollen floor edges, repaired wall panels. | Has the wet area leaked or been rebuilt? |
| Sink and plumbing | Drips, water marks, cabinet-floor damage, corrosion around fittings. | Are invoices available for plumbing repairs? |
| External water services | Staining inside corresponding cupboards, loose filler or hot-water surrounds. | Were penetrations removed and resealed or only surface-sealed? |
Treat odour and mould carefully
Australian public-health guidance links indoor dampness and mould with respiratory and allergic symptoms, and notes that hidden mould may be associated with a mouldy or earthy odour. People with asthma, allergies, chronic lung disease or weakened immune systems may be more susceptible.
Do not disturb a large or concealed mould-like area during a buying inspection. Avoid sniff-testing surfaces or brushing material to see what it is. If contamination appears extensive, recurring or hidden, pause and obtain advice from an appropriate mould, indoor-environment or caravan-repair professional. A caravan seller applying fragrance, ventilation products or fresh paint does not establish the cause has been removed.
Ask for the repair story, not just reassurance
Request service invoices, repairer reports, insurance records, photographs taken before and during repairs, materials replaced, sealant products used and any moisture or structural assessment. Match dates and locations. A strong file should explain the entry path, the damage found, how affected material was treated or replaced, how the opening was resealed and what follow-up checks were completed.
A statement that “all caravans leak” or “it was only condensation” is not evidence. Condensation can occur, but repeated staining, material damage or water tracks still need an explanation.
For an assessment or repair quote, search the Australian Caravan Repairer Directory by town, postcode, state or service.
Moisture meters have limits
A suitably experienced inspector may use a moisture meter as one part of a broader assessment. Different meters, materials, surface conditions, temperatures and caravan construction can affect readings. Metal fixings, foil insulation and recent rain can also influence results.
There is no responsible universal number that proves every caravan wall is dry or damaged. Ask the inspector to explain the device, reference areas, pattern of readings, construction and limitations. A single low reading on a dry day does not guarantee that there has never been water entry or concealed damage.
Pause, investigate or walk away
| Evidence | Suggested response |
|---|---|
| No obvious indicators and strong records | Continue normal independent inspection; absence of visible signs is not a guarantee. |
| One minor explained repair | Verify the invoice, repair scope and follow-up result before valuing the caravan. |
| Several linked warning signs | Pause and obtain a targeted moisture and structural assessment plus a written repair scope. |
| Soft structure, widespread mould-like growth or inconsistent identity/repair story | Do not pay. Seek specialist advice or leave the transaction. |
| Seller refuses access or evidence | Treat the unresolved uncertainty as part of the risk; be prepared to walk away. |
Before-deposit checklist
- Inspect outside and inside in daylight.
- Map each internal sign to nearby openings and plumbing.
- Check corners, cupboards, beds, wet areas and service hatches.
- Ask specifically about leaks, storm damage, insurance claims and resealing.
- Review invoices and repair photographs.
- Arrange an independent inspection with a clear moisture and structure scope.
- Obtain a written repair scope and quote before negotiating.
- Do not rely on one meter reading or a newly cleaned interior.
Take the next step
Use the free Used Caravan Inspection Checker to record the inspection consistently. Read the owner-focused Caravan Water Leaks and Seal Inspection guide to understand maintenance evidence, then return to the Buying a Caravan in Australia hub.