Signs worth investigating
Recurring stains, damp or deteriorating finishes, water appearing after rain or snowmelt, and leaks near windows or exterior wall transitions warrant a closer look.
Services / Exterior Water Leak Detection
Exterior Building-Envelope Service · Calgary
Exterior Water Leak Detection & Repair in Calgary
Investigate water entry around windows, walls and exterior transitions, then plan targeted repairs based on accessible conditions and findings.
Exterior leak investigation
Follow the water clues back to the building exterior.
Visible staining can appear away from the actual entry point because water may travel inside a wall before becoming visible. A review considers the history, location and conditions associated with the leak, then checks accessible exterior details that may be contributing.
Review the pattern
We discuss when the leak began, where it appears, weather or other conditions around each occurrence, and any previous repairs or changes.
Assess accessible details
The review may include accessible windows, wall transitions, cladding, flashing and sealant details around the reported area and nearby potential paths.
Define targeted repairs
Findings guide a written scope for relevant window or wall water-entry repairs, flashing or sealant correction, and building-envelope troubleshooting.
What the assessment and written scope cover
The scope records the reported concern, accessible conditions reviewed, findings, recommended targeted repair, access assumptions and factors that may change if concealed conditions are uncovered. A leak may need further investigation if the entry path is not clear during the initial review.
Related exterior work
Repairs can involve more than one exterior detail.
When findings point to connected exterior components, these services may be relevant to the repair scope.
Stucco repair
Repair damaged stucco and coordinate nearby transitions.
Siding
Review siding and cladding details as part of the exterior assembly.
Chimney repair
Address chimney flashing and masonry details when the leak is at the chimney.
Building-envelope maintenance
Plan maintenance and repairs across vulnerable exterior transitions.
Exterior leak FAQs
Common questions about water entry
Learn what an exterior assessment can cover and how repair planning works.
Why can a stain appear away from the leak source?
Water can move within a wall assembly before it reaches an interior finish. The visible stain may show where water finally emerges, rather than the exterior opening where it entered, so nearby and higher wall details may also need review.
Can a window-area leak involve flashing or wall details?
Yes. Water entry near a window can involve the perimeter sealant, flashing, cladding, or the way the opening connects to the surrounding wall. The accessible details are reviewed together before a repair scope is defined.
What information should I share before an assessment?
Share where and when water appears, what the weather was like, how often it happens, when it first began, and any changes or previous repairs near the area. Photos and a brief timeline can help focus the site review.
Will opening part of the exterior sometimes be necessary?
Sometimes. If accessible visual review cannot clarify a concealed transition or condition, limited opening may be recommended. Any opening and follow-up repair should be discussed and included in the agreed scope before work proceeds.
What affects investigation and repair costs?
Cost depends on access, the number and size of affected areas, the investigation needed, concealed conditions and the repair scope. The written estimate explains the proposed assessment and work; concealed conditions can change what is needed after an area is opened.
How does exterior leak detection differ from plumbing leak detection and water damage restoration?
This service investigates water entering through accessible exterior building-envelope details such as windows, cladding transitions, flashing and sealant. Plumbing leak detection concerns water supply or drain systems. Water damage restoration addresses affected materials, drying and reconstruction; see our water damage restoration service.
Exterior leak assessment
Share what you have noticed.
Include the location, timing, weather conditions and any photos or repair history that may help us understand the concern. We can review the details and arrange an assessment where needed.
Estimate factors include:
- Access and affected areas
- Investigation requirements
- Concealed conditions
- Targeted repair scope
If water appears to be coming from foundation drainage or a structural condition, that work requires separate assessment. Surface parging or sealant alone should not be treated as foundation waterproofing.
Contact LEL Construction
Call or email us to discuss your project.
- Service Area
- Calgary and surrounding communities
- Hours
- Mon–Fri: 7am–6pm
Sat: 8am–4pm