Windows in masonry openings

Replace or enlarge a window in brick/stone while coordinating lintel, bearings, cavity, flashing, drainage, anchorage and air/water continuity.

VERT / GREEN = documenter/entretenir · JAUNE / YELLOW = vérifier avant travaux · ROUGE / RED = arrêter le DIY et faire valider.

Masonry opening enlarged
Verify lintel/bearings and load path before demolition. Flashing/cavity unknown or deteriorated
Open enough to restore drainage and enclosure continuity. Crack above window
Diagnose lintel, corrosion/movement before replacing only the window. Opening stable/details documented
Photograph lintel, flashing and transitions before finishing.

What the professional checks

Verify lintel, bearings and masonry
Coordinate window, flashing, cavity and air/water layers

Official sources

CNRC — Guide Partie 9

Checked: 2026-08-22

Related path

Continue with the right tools

These links connect this page to the next useful checks and decisions without repeating the full content.

Connect symptoms to the enclosureStart from condensation, staining, odours or movement before choosing a repair.Open →Adapt the enclosure to climateConnect heat, cold, water, wind and wildfire to building priorities.Open →Assess overall resilienceReview water, climate, safety, autonomy and records with a local score.Open →Screen hazardous materialsIdentify situations where work should stop and testing is needed before disturbance.Open →Open climate guidanceReview climate constraints relevant to assemblies and materials.Open →

Tools related to this issue

Whole-home action plan

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Foundations and soils

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