System upgrades (electrical, HVAC, plumbing) take 4–12 weeks depending on scope.
2–4 weeks. Permit → utility work → inspection.
1–3 weeks. Installation, ductwork modifications.
2–6 weeks. Water line replacement, sewer work.
2–4 weeks. Depends on size and weather.
4–12 weeks. Sistering, underpinning, waterproofing.
Can add 1–4 weeks depending on scope.
Hidden damage discovered during installation.
Service disconnects/reconnects require scheduling.
Custom HVAC units or specialized equipment have lead times.
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