Woody’s Plumbing & Heating

Massachusetts requires a permit for any HVAC system replacement, reviewed by Lexington's building department. A heat pump retrofit also needs a separate electrical permit for the new condenser circuits. The key Lexington wrinkle is historic review: homes within the Battle Green, East Village, and other regulated districts need approval from the Historic Districts Commission for any visible exterior change, including outdoor heat pump units. Installers often plan unit placement out of sight from the street to ease approval. Reputable contractors manage the permits and any required design review.

Lexington costs run high relative to the rest of the state because of affluent expectations, larger homes, and historic constraints. A full whole-home heat pump retrofit generally runs $22,000–$35,000 before rebates; a single-zone ductless mini-split usually lands at $5,000–$8,000 installed; and a like-for-like gas or oil boiler replacement is typically $8,000–$14,000. Antique colonials with plaster walls and no chases push higher because of line-set routing, and historic-district homes can add design-review time and screening costs for outdoor units.

Massachusetts requires a written contract and a Home Improvement Contractor registration for most residential hvac work; ask for the registration number and check it before paying a deposit.

More on permits, costs, rebates and common questions, plus every other hvac contractor serving the town, on the HVAC in Lexington page.