Home renovations disturb the equilibrium between your home and its resident pests. Opening walls reveals hidden cockroach populations, termite damage, and rodent nests you never knew existed. Construction debris and open exterior walls invite new pests in. And gaps left unsealed after the contractor leaves become permanent pest highways.
The renovation window is both a risk and an opportunity — it's the best time to treat wall voids you'll never access again and seal entry points before they're covered up.
Pre-renovation pest inspection: Before opening walls, have a professional pest inspection focused on the renovation area. Finding active termite damage before demolition allows treatment planning. Discovering a cockroach population in a kitchen wall means treating before the cockroaches scatter into the rest of the house during demo.
If termite damage is found: Treat before reconstruction. This is the cheapest time to apply liquid termiticide or borate wood treatment — the wood is exposed and accessible.
Apply boric acid or CimeXa inside wall cavities before they're closed up with drywall. A light dusting on the bottom plate, behind electrical boxes, and around pipe penetrations provides decades of cockroach and silverfish protection. This is the one time you have direct access to these voids — use it.
Apply borate wood treatment (BoraCare) to exposed framing if you're in a termite-prone area. Borate-treated wood is permanently protected against termites, carpenter ants, and wood-boring beetles. This treatment is impossible once drywall is installed.
Seal every penetration as it's created. Every new pipe, wire, and duct that passes through a wall or floor should be sealed with fire-rated caulk or expanding foam before drywall covers it. Contractors often skip this — add it to your punch list.
Walk the exterior. Check every new utility penetration, vent opening, and siding junction for gaps. Construction often creates new entry points that weren't there before — new dryer vents, bath fan exhausts, and HVAC line penetrations.
Clean aggressively. Construction debris — sawdust, cardboard, food wrappers from workers' lunches, spilled drinks — attracts pests immediately. Deep-clean the renovation area before moving furniture back in.
Set monitoring traps. Renovation disrupts existing pest populations and may have driven them into new areas of the house. Place glue boards in the renovated area and adjacent rooms to catch any pests displaced by construction.