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Visual and moisture-source investigation

Mold and air quality inspection in
Montreal

Our investigation focuses first on visible conditions, moisture sources, ventilation and building defects related to indoor air quality. Laboratory sampling can be added when confirmation or documentation is useful.

Scope of our investigation The investigation is visual and non-invasive. It documents the visible and accessible condition of the building, observable moisture sources and conditions related to indoor air quality. It is not a medical diagnosis. The investigation does not certify that a property is mold-free or safe for health. For health symptoms, consult a qualified healthcare professional. Laboratory sampling is offered as a complement when confirmation or documentation is useful; results reflect only the sample collected, at the time and location of collection.
Three service levels

Investigate, sample,
verify.

Identifying the moisture source comes first. Laboratory sampling is offered as a complement when useful, and we also offer post-remediation review after a third-party contractor's work. We serve Montreal, Laval and the South Shore. Our thermal imaging service can help identify temperature patterns that may suggest hidden moisture.

Mold & moisture investigation Visual inspection, moisture readings, ventilation observations, thermal imaging where useful, source analysis and photos. Practical recommendations.
The investigation begins with visible conditions and observable moisture sources: stains, odours, condensation, infiltrations, ventilation, affected materials and moisture readings. The goal is to understand what may contribute to mold-like growth, without opening walls or guaranteeing the condition of hidden components. The report documents observations, observation limits and practical recommendations.
Lab sampling add-on (when warranted) Available as an add-on when confirmation or documentation is useful. Surface or air samples submitted to a qualified laboratory when applicable, with written interpretation.
Sampling is not necessary in every situation. It can be added when analytical confirmation is useful: a suspect surface, documentation for a file, post-remediation follow-up, or a specific question that cannot be clarified visually. Results reflect only the sample collected, at the time and location of collection. Laboratory and air-test fees are quoted separately.
Post-remediation review Independent visual and moisture review after remediation, with sampling available when appropriate.
After work performed by a third-party contractor, the post-remediation review documents visible conditions, moisture readings and accessible treated areas. Sampling can be added when relevant. This review does not guarantee the absence of hidden conditions and is not a health or safety certification; it confirms only the observable conditions at the time of the visit.
Local realities

Moisture and mold-like growth in
Montreal buildings.

Montreal's climate, geology and building stock can create conditions that favour moisture accumulation and surface growth. The investigation is designed to identify observable moisture sources before analytical sampling is considered.

Basement moisture Montreal basements deal with variable groundwater, older foundations and aging drainage. The investigation looks for visible moisture sources — infiltration, condensation, capillary rise — before analytical sampling is considered.
Basement moisture can come from infiltration, condensation, capillary action, surface drainage or ventilation problems. The investigation documents visible indicators, moisture readings where useful, and limitations caused by finished walls or restricted access. It does not see behind finishes or confirm a hidden French drain, but it can support targeted specialist verification.
Insufficient ventilation Poor ventilation in bathrooms, kitchens or attics can favour condensation and surface growth. We document accessible fans, visible heat loss and accumulated moisture indicators.
Ventilation issues are often connected to occupant use, missing exhaust, blocked ducts, attic air leakage or poor air exchange. The report documents observable conditions and recommends appropriate specialist follow-up where needed. The investigation does not replace HVAC design or a complete indoor air-quality analysis; it documents observable indicators.
Condensation Condensation around windows, cold walls or frames often signals an imbalance between indoor humidity and ventilation. The investigation helps distinguish seasonal condensation from a deeper structural indicator.
Condensation can come from excess indoor humidity, insufficient ventilation, cold surfaces or thermal bridges. We observe windows, cold walls, frames, ceilings, corners and zones where moisture concentrates. The report helps distinguish indicators consistent with condensation from those that may suggest infiltration or another moisture source to verify.
Past water infiltration Old water stains, repaired drywall or ceiling marks may indicate a historical leak. We document what is visible and where further verification may be appropriate.
Stains, marks, localized repairs, persistent odours or warped materials may indicate a history of infiltration. The investigation documents visible indicators and looks for signs of current moisture when accessible with available tools. It does not confirm the condition of hidden assemblies, but it identifies areas to monitor or to have verified more deeply.
Flat roofs and masonry Flat roofs and older masonry are frequent moisture sources in Montreal. The investigation observes interior indicators — stains, deformation, odours — and points to the appropriate specialist verification.
Flat roofs, flashings, masonry walls and openings can contribute to infiltration in Montreal buildings. The investigation observes accessible interior indicators and, when safe and planned, visible exterior elements. It does not replace roofing or masonry expertise, but it documents signs that justify specialist verification.
Recent renovations Quick renovations can cover water damage without resolving the source. We look for contextual indicators — uneven finishes, persistent odours, abnormal moisture readings — that deserve closer attention.
Renovations can improve a building, but they can also mask moisture traces without correcting the source. We pay attention to uneven finishes, recent localized materials, odours, repainted areas, repairs around windows or ceilings, and abnormal moisture readings. The inspection remains visual and non-destructive; it does not guarantee the absence of hidden conditions.
When sampling is useful Laboratory sampling is not required in every situation. It is added when analytical confirmation is useful for a decision, claim or post-remediation follow-up.
Surface or air sampling can support a specific question, but it has limitations and must be interpreted alongside the conditions observed during the visit. The report explains why sampling was or was not recommended and documents the observable conditions.
What we investigate

A moisture-source-first
approach.

The investigation focuses on visible conditions, accessible moisture sources, and building defects that may contribute to mold-like growth. Laboratory sampling can be added when needed.

✓Visible conditions — Visible mold-like growth, water stains, discolouration and moisture signs in accessible areas
✓Moisture readings — Hygrometer and moisture-meter readings on walls, floors and ceilings
✓Accessible moisture sources — Infiltrations, condensation, plumbing issues and observable building defects
✓Ventilation and HVAC — Observations on ventilation, ambient humidity and indoor air-quality contribution
✓Accessible basement and crawlspace — Risk zones accessible at the time of visit
✓Bathroom, kitchen and windows — Joints, caulking, condensation and local ventilation
✓FLIR thermal imaging (when useful) — Helps identify temperature patterns that may suggest hidden moisture, non-invasive
✓Surface sampling (when warranted) — Swab or tape lift submitted to a qualified laboratory when applicable
✓Air sampling (when warranted) — Spore-trap cassettes with outdoor reference sample, when a specific question justifies it
✓Documented limitations — Inaccessible areas and limiting conditions noted in the report
Our process

4 steps to a
rigorous investigation.

1
Consultation
Describe your situation: odours, water damage, ventilation, visible conditions. We determine the appropriate approach.
2
On-site investigation
Visual inspection, moisture readings, ventilation observations and thermal imaging when useful. Duration 1 to 3 hours depending on scope.
3
Laboratory sampling (when warranted)
If justified, surface or air samples submitted to a qualified laboratory when applicable. Results in 3 to 5 business days.
4
Report & recommendations
Report with field observations, moisture-source analysis, laboratory results where applicable, interpretation, and practical corrective recommendations.
Transparent pricing

Three service
levels.

Custom-quoted based on the service level required and the scope of investigation. Contact us for a quote tailored to your situation.

🔍
Mold & moisture investigation
Visual inspection, moisture readings, ventilation observations, source analysis, photos and practical recommendations.
Custom quote
🧪
Investigation + laboratory sampling
The full investigation plus surface or air samples submitted to a qualified laboratory when applicable, with written interpretation.
Custom quote
✅
Post-remediation review
Independent visual and moisture review after a third-party contractor's work, with sampling available when appropriate.
Custom quote
FAQ

Frequently asked questions about
mold and air quality.

Everything you need to know about mold testing and indoor air quality in Montreal.

How do I know if I have a moisture or mold problem?+
Common indicators include a musty odour, stains on walls or ceilings, excessive condensation, and a history of water damage or flooding. The investigation focuses on identifying the observable moisture source.
Is air testing always necessary?+
No. In many situations, visual identification of the moisture source and building conditions is more useful than sampling. Laboratory sampling is added when confirmation or documentation is useful.
Does the investigation diagnose health problems?+
No. The investigation documents the visible and accessible conditions of the building and indoor air. For health symptoms, consult a qualified healthcare professional.
How much does an investigation cost?+
The rate is custom-quoted based on the scope of the investigation, number of zones, whether laboratory sampling is needed, and the area to cover. Contact us for a quote tailored to your situation. See our detailed pricing for context on other services.
What is the difference between the investigation and sampling?+
The investigation documents visible conditions, moisture sources and building defects. Laboratory sampling (surface or air) adds analytical confirmation when useful; results reflect only the sample collected, at the time and location of collection.
How much does a home inspector cost in Montreal? What is the price of an inspection?+
Our rates start at $550+tax for a condo inspection, $750+tax for a single-family home inspection, and custom quote for plex, multi-unit and commercial inspections. The cost of a home inspector, house inspector, property inspector or residential building inspector depends on the size, age and complexity of the building. See our detailed pricing or contact us for a precise quote.
Are you a certified, licensed and accredited home inspector?+
Yes. We are InterNACHI-certified (International Association of Certified Home Inspectors), IBC Network members, and professionally insured. As a certified inspector, licensed inspector, accredited inspector, home inspector, house inspector, property inspector or residential building inspector, we meet the most demanding North American standards of practice.
Which areas do you offer your home inspection services?+
We offer inspection services in Montreal and throughout the Greater Montreal area: Island of Montreal (all boroughs — Verdun, Plateau, Rosemont, Côte-des-Neiges, Westmount, Saint-Léonard, Ville-Marie, Mercier–Hochelaga, Rivière-des-Prairies–Pointe-aux-Trembles, Montréal-Nord, and more), West Island, Laval, South Shore (Brossard, Longueuil, Boucherville, Saint-Bruno, etc.), North Shore (Terrebonne, Mascouche, Repentigny, Blainville, Sainte-Thérèse, etc.), Laurentides, Lanaudière, as well as Estrie, Montérégie and Mauricie. Bilingual FR/EN service available.
How long does a home inspection take?+
A pre-purchase inspection typically takes 3 to 4 hours on site for a single-family home, 2 to 3 hours for a condo, 4 to 6 hours for a 4-12 unit plex or multi-unit, and longer for commercial buildings or heritage properties. The complete report with photos is delivered within 24h*. Duration varies based on size, age, complexity and accessibility of building components.
What other home inspection services do you offer?+
We offer a complete range of inspection services: pre-purchase inspection (also called pre-buy inspection or buyer inspection), home inspection (house inspection), condo inspection (condominium, divided and undivided co-ownership, apartment), plex and multi-unit inspection (duplex, triplex, fourplex, rental property, multi-family, income property), commercial inspection, pre-sale inspection, new construction inspection, pre-delivery inspection, preventive inspection, common area inspection, hidden defect expertise, mold and air quality inspection, and thermography.
Our other services

Related
services.

🏠
Pre-purchase inspection
Complete inspection for buying a single-family home in Montreal.
🏢
Condo inspection
Specialized inspection for condo units in Montreal.
🏗
Multi-unit inspection
Duplex, triplex and multi-unit buildings.
Defects related to humidity and mold

Related topics
frequently observed.

A few documented contexts where humidity or mold can appear. The visual investigation identifies observable conditions — for health symptoms, consult a qualified healthcare professional.

💧
Mold in Laval homes
Documented regional examples — typical contexts where visual investigation is useful.
Read article →
🏠
Mold in Verdun homes
Another regional example — basement conditions and ventilation considerations.
Read article →
🌬️
Mold in Villeray / Parc-Extension
Older stock context — recurring patterns in basement moisture and ventilation.
Read article →
🧱
Stone foundations
Older residential stock — basement humidity is a recurring concern.
Read article →
🏠
Flat roofs
End-of-life membranes = infiltration and mold at attics or ceilings.
Read article →
🌡️
Complementary thermography
Detection of thermal anomalies that may suggest moisture presence — confirmation always required.
View service →
Book now

Concerned about mold or
air quality?

Available 7 days a week. Visual investigation first, laboratory sampling when warranted. InterNACHI certified · IBC Network.
Urgent situation before condition removal? See urgent inspection.

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