What should a ductwork design plan include for a house renovation near Commercial Drive?

A ductwork design plan for a house renovation in the Commercial Drive area should cover eight core elements, and getting them right before a contractor starts cutting holes is what separates a comfortable, efficient system from one that needs expensive corrections later.

What a Proper Duct Design Plan Covers

Start with a room-by-room heat loss and heat gain calculation (Manual J or equivalent). This is the foundation. Every duct size, every register location and every equipment capacity follows from those numbers. Sizing from the old system or from square footage alone is one of the most common and costly mistakes in renovation work.

From there, the plan should include:

A supply and return layout showing the location, size and type of every register and grille, with return air paths that allow air to circulate back to the air handler without relying on gaps under doors. Older Commercial Drive-area houses often have one central return, which causes pressure imbalances and comfort complaints upstairs.

Duct sizing calculations (Manual D) for every branch and trunk, matched to the airflow each room needs. Undersized ducts create noise and static pressure; oversized ones waste money and reduce humidity control.

Equipment selection and placement, including the air handler or furnace location, the path for the flue or heat pump refrigerant lines, and the condensate drain route. In a two-storey or basement-plus-main renovation, where the air handler sits changes everything about duct routing and cost.

Ventilation integration, because Vancouver's wet climate makes this non-negotiable. The plan should show how an HRV or ERV connects to the duct system, where the fresh-air intake and exhaust terminate on the exterior, and how the system balances supply and exhaust airflow. A poorly integrated HRV is a common oversight in renovation projects.

Sealing and insulation specifications for ducts running through unconditioned spaces such as a crawlspace or attic, including the target leakage rate. Unsealed duct joints in a crawlspace can waste 20 to 30 percent of heating energy.

Filter and access provisions: a properly sized filter slot, a MERV rating appropriate for the equipment, and access panels for every section that will need cleaning or inspection. Wildfire smoke events have made MERV 11 to 13 filtration a practical consideration for many Vancouver households.

Permit requirements: in the City of Vancouver, installing or replacing a heating or cooling system triggers a mechanical permit (required since July 2022) in addition to the electrical permit the city issues itself for the heat pump or furnace circuit. If the renovation involves removing or capping a gas line, a gas permit is also required, issued by the City of Vancouver. Your contractor should pull all of these and include the fees in the quote.

A fair quote for ductwork design and installation in a Metro Vancouver house renovation typically runs $8,000 to $20,000 for a full new duct system, and $20,000 to $30,000 or more when combined with a new heat pump and electrical work. What moves that number most is whether usable duct pathways exist in the existing framing or whether soffits, chases and floor cavities need to be built from scratch.

Getting two or three quotes with the full design plan attached is the best way to compare them honestly; Vancouver HVAC Pro can connect you with local contractors who work in the Commercial Drive area.