Thermal imaging has become a standard tool in modern building inspections — but its use varies dramatically between inspection companies. Some offer it as a premium add-on. Some list it as an included feature but rarely deploy it. At PinPoint, thermal imaging is built into every inspection we conduct across all three tiers: Structural, Structural Plus, and Structural Premium. This guide explains what thermal imaging actually detects, how it works in the context of a Perth building inspection, and the specific issues it catches in Perth's housing stock that a standard visual inspection would miss.
What Is Thermal Imaging?
Thermal imaging (also called infrared thermography) uses a specialised camera to detect surface temperature differences across building materials. The camera doesn't see through walls — but it detects heat patterns that indicate what's happening beneath the surface. Temperature anomalies point to moisture, heat loss, electrical faults, pest activity, and other conditions that are invisible to the naked eye.
Our inspectors use the Mileseey TR384E thermal camera. This is a professional-grade instrument designed for building diagnostics — not a consumer-grade device bolted onto a smartphone.
What Thermal Imaging Detects
Moisture and Water Ingress
Water-affected building materials — wet insulation, damp wall cavities, moisture behind tiles, and water-damaged ceiling plaster — retain temperature differently from dry materials. They appear as cooler areas on the thermal image, even when the wall surface looks completely normal. This is the most common application of thermal imaging in Perth building inspections.
Moisture in walls is a significant issue for several reasons: it accelerates structural deterioration, creates conditions that attract termites, promotes mould growth, and can indicate active leaks that aren't yet visible. Catching moisture early — before it causes widespread damage — is one of the most valuable things a thermal scan adds to an inspection.
Electrical Hotspots
Overloaded circuits, failing connections, and deteriorating wiring all generate excess heat before they fail. Thermal imaging can detect hotspots in switchboard components, power points, and cable runs that indicate an electrical fault developing — often before any visible sign of a problem exists. In homes where the electrical system hasn't been updated in decades, this can be an important safety finding.
Missing or Degraded Insulation
Insulation gaps, compressed batts, and areas where ceiling or wall insulation is missing show up clearly on a thermal scan. Heat moves through uninsulated sections at a different rate than insulated areas, creating a visible pattern. This is particularly relevant in Perth's climate — ceiling insulation is critical for managing summer heat loads, and gaps in insulation have a direct impact on energy performance and comfort.
Roof and Ceiling Leaks
A roof leak doesn't always show up as a visible stain immediately. Water can track along roofing battens and ceiling frames, appearing as a water stain metres away from the actual entry point. Thermal imaging identifies moisture in ceiling areas that may not yet show visible staining — allowing the source to be traced and assessed more accurately.
Termite Activity Indicators
Active termite workings generate a slight thermal signature — termite colonies regulate temperature within their galleries, and the moisture associated with active workings also shows up on thermal scans. Thermal imaging is not a definitive termite detection tool on its own, but it is one indicator our inspectors use alongside physical inspection and, where appropriate, our Termatrac termite detection device.
Air Leaks and Gaps in the Building Envelope
Gaps around window frames, door frames, penetrations through walls, and poorly sealed joins can be identified thermally — particularly on cooler mornings when the temperature differential between inside and outside is greater. In Perth's climate, these gaps are more relevant to energy performance than weather protection, but they can also indicate construction defects in newer homes.
Perth-Specific Issues Thermal Imaging Catches
Moisture in Double-Brick Walls
Perth's dominant construction method is double-brick — two leaves of brickwork separated by a cavity. The cavity is designed to manage moisture, but it can fail when the cavity fill becomes contaminated with mortar droppings (known as mortar snots), when weep holes are blocked, or when garden beds are built up above the damp-proof course level. Moisture that enters the cavity and saturates the inner leaf is invisible from the surface but clear on a thermal scan.
This is a common finding in older Perth homes in suburbs like Subiaco, Mount Lawley, and Nedlands where brick cavity construction has been in place for 40-60 years. It's also found in newer construction where weep holes were blocked during or after building.
Older Home Insulation Deficiencies
Perth homes built before the 1990s frequently have inadequate ceiling insulation — sometimes none at all. When these homes were built, insulation standards were minimal and energy performance wasn't a consideration. Thermal imaging maps exactly where insulation exists, where it's degraded, and where gaps exist. For buyers of older homes in established suburbs, this is useful both for understanding energy costs and for identifying areas where heat-related deterioration may be occurring.
Slab-on-Ground Moisture
In Perth's sandy soil areas, moisture rising through slab-on-ground construction can be a finding — particularly in older homes in the coastal strip from Wembley through to Cottesloe. Ground moisture migrating upward through the slab and into floor finishes shows up thermally and can point to drainage or subfloor ventilation issues that need addressing.
Post-2020 Construction Issues
In homes built during the HomeBuilder construction surge (2020-2023) across new estates in Baldivis, Alkimos, Ellenbrook, and Harrisdale, thermal imaging has identified insulation installed incorrectly — compressed, displaced, or missing from sections of the ceiling. These homes are often only 2-4 years old and still within builder warranty periods. Thermal documentation supports warranty claims where remediation is needed.
Thermal Imaging Is Included in All Three Inspection Tiers
This is a deliberate decision, not a marketing line. Thermal imaging is a core inspection tool, not a bolt-on feature for higher-paying clients. Whether you're booking our Structural entry-level inspection or our Structural Premium full-coverage inspection, your report includes thermal imaging observations from across the property.
The difference between our inspection tiers is the scope of what's assessed — how many building elements, how deep the coverage. Thermal imaging supports all of those assessments, so it belongs in all of them.
- Structural: Core structural elements including exterior walls, roof structure, ceiling, roof covering, and moisture testing. Thermal imaging used to support moisture assessment throughout.
- Structural Plus: All Structural elements plus internal walls, insulation and ductwork, doors and windows, roof drainage, retaining walls, and surface drainage. Thermal imaging particularly relevant for insulation assessment in this tier.
- Structural Premium: All Structural Plus elements plus floors, fixed appliances, power points, lights and switches, hot water, plumbing fixtures, and drainage. Thermal imaging adds value for electrical and plumbing assessments at this tier.
See the full inspection tier comparison and pricing for a detailed breakdown of what each tier includes.
What Thermal Imaging Cannot Do
It's important to be accurate about what thermal imaging adds — and what it doesn't replace.
- It doesn't see through walls. Thermal imaging detects surface temperature patterns. It can indicate what's happening beneath the surface, but it cannot confirm what it is without further investigation.
- It's not a definitive termite detector. Thermal imaging can indicate conditions associated with termite activity, but a dedicated timber pest inspection using physical sounding, moisture meters, and Termatrac technology is required to confirm termite presence. Our combined building and pest inspection includes both.
- Conditions matter. Thermal imaging is most effective when there's a temperature differential between inside and outside. In Perth's summer when external and internal temperatures are similar, some readings are less pronounced — though moisture and electrical anomalies are still detectable.
- It doesn't replace an electrician or plumber. A thermal finding that suggests an electrical or plumbing issue requires follow-up by a licensed tradesperson. Our Structural Premium inspection notes the operation of systems and identifies anomalies — it is not a safety certification by an electrician or plumber.
How Thermal Images Appear in Our Reports
When thermal imaging identifies an anomaly, the report includes both the standard photograph and the thermal image of the same area, with the inspector's interpretation of what the thermal pattern indicates. This dual-image approach makes it clear what was seen and what it means — you're not looking at unexplained colour blobs without context.
Our reports are generated using Home Inspector Pro, and thermal images are integrated directly alongside the relevant findings rather than presented as a separate appendix.
FAQ
Is thermal imaging included in every PinPoint inspection, or is it an add-on?
Thermal imaging is included in all three inspection tiers — Structural, Structural Plus, and Structural Premium. It is not an add-on or an upgrade. Our inspectors use the Mileseey TR384E thermal camera as part of every inspection they conduct.
Can thermal imaging find termites?
Thermal imaging can detect conditions associated with termite activity — moisture anomalies and slight thermal signatures from active workings. However, it is not a definitive termite detection method. A timber pest inspection (AS 4349.3) using physical sounding, moisture meters, and Termatrac technology is required to properly assess for termite presence. A combined building and pest inspection includes both.
Does thermal imaging work on double-brick homes?
Yes. Thermal imaging is particularly useful on double-brick construction because moisture trapped in the brick cavity — which is invisible from the surface — creates a temperature differential that shows up clearly on the thermal scan. Moisture in double-brick walls is one of the most common and useful thermal findings in Perth's established suburbs.
Does weather affect the accuracy of thermal imaging?
Temperature differential between inside and outside improves the clarity of some thermal readings — particularly for insulation assessment and air leakage. However, moisture-related thermal anomalies and electrical hotspots are detectable in a wide range of conditions. Perth's cooler months (May to September) tend to produce the clearest thermal results for insulation and air leakage assessment.
Book an Inspection
If you're buying a property in Perth and want an inspection that uses thermal imaging as standard — not an expensive add-on — our combined building and pest inspections start from $497 for houses, with reports delivered within 24 hours. As a 5-star rated building and pest inspection team across Perth, we inspect properties from Two Rocks to Mandurah, seven days a week.
Call 0481 575 747 or book online.
