150 Sq Ft Mudroom and Laundry Addition Cost in Port Coquitlam

A 150-square-foot mudroom and laundry room addition in Port Coquitlam typically costs $75,000 to $130,000 fully completed, including foundation, structure, plumbing, electrical, HVAC, and finishes. That works out to roughly $500 to $870 per square foot, which surprises many homeowners — small additions carry a higher per-square-foot cost than larger ones because the fixed costs of mobilization, foundation work, permits, and connecting to existing systems are spread over fewer square feet.

The foundation represents a significant portion of the budget for a small addition. A 150-square-foot concrete foundation — whether a crawl space, slab-on-grade, or full-depth perimeter footing — costs $10,000 to $20,000 depending on soil conditions and the chosen foundation type. Port Coquitlam sits on the Coquitlam River floodplain in some areas, and properties near the river or in low-lying zones may require engineered fill, deeper footings, or drainage measures that add to foundation costs. A geotechnical assessment ($2,500 to $4,500) may be required by the City for your building permit application.

Framing, sheathing, roofing, and exterior cladding for a 150-square-foot addition run $15,000 to $30,000. The cost varies based on whether the addition has a simple shed roof that ties into the existing roofline (less expensive) or a gable roof that matches the main house (more complex). Matching your existing exterior cladding — whether that's vinyl siding, fibre cement (Hardie board), stucco, or wood — is important for both aesthetics and resale value. If your home has older cladding that's been discontinued, sourcing a match can add cost or require creative solutions.

The plumbing component is what distinguishes this from a simple room addition. A laundry room requires hot and cold water supply lines, a drain for the washing machine (with proper venting through the roof), and potentially a utility sink. If you're connecting to existing plumbing in an adjacent kitchen or bathroom, the plumbing work might run $4,000 to $8,000. If the addition is on the opposite side of the house from existing plumbing, running new supply and drain lines under or through the house can push plumbing costs to $8,000 to $15,000. Your laundry machines themselves — a quality washer and dryer — add $2,000 to $4,000 to the budget.

Electrical work for a mudroom and laundry combination includes a dedicated 240-volt circuit for the dryer (or a standard circuit if you're using a ventless heat-pump dryer), general lighting, exterior lighting at the entry door, outlets, and potentially a small electrical panel extension if your main panel lacks capacity. Budget $3,000 to $6,000 for electrical.

Heating the space is straightforward in Metro Vancouver's mild climate. A single mini-split heat pump head ($3,500 to $5,500 installed) handles both heating and cooling for a 150-square-foot room efficiently. Alternatively, an electric baseboard heater ($500 to $1,000 installed) works for a mudroom where comfort expectations are more utilitarian. In-floor radiant heating is a popular mudroom choice for drying wet boots and keeping tile floors warm, adding $2,000 to $4,000.

Interior finishes for a mudroom and laundry room should prioritize durability and water resistance. Porcelain or ceramic tile flooring ($1,500 to $3,500 for 150 square feet installed) is the most practical choice. Built-in mudroom cabinetry with hooks, cubbies, a bench, and upper storage runs $3,000 to $8,000 for a custom or semi-custom installation. Laundry cabinetry and countertops add $2,000 to $5,000. Drywall, paint, trim, and a solid exterior door bring finishing costs to $8,000 to $18,000 total.

Soft costs for this project include a building designer or architect ($3,000 to $6,000 for a small addition), structural engineer ($2,500 to $4,500), surveyor ($1,500 to $2,500), and City of Port Coquitlam building permit fees ($1,500 to $3,000). These soft costs total $8,500 to $16,000 — a proportionally large share of a small project's budget.

The most cost-effective approach is to locate the addition adjacent to existing plumbing so you can minimize pipe runs, choose a simple shed-roof design that ties into the existing eave, and use durable mid-range finishes rather than premium materials. A mudroom doesn't need granite countertops — save that budget for the laundry cabinetry and storage solutions that will make the room genuinely functional for your family.

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