HVAC Design Whitby, Ajax & Pickering — Durham West Permit Packages. BCIN-Stamped. Delivered in 48 Hours.
Upload your floor plans today. Get a firm quote in 24 hours. Receive your BCIN-stamped CSA F280 heat loss report, HVAC design & mechanical drawings — calculated at your town’s correct design temperature, not a GTA average.
Three Towns, One Highway, Different Design Temperatures
Pickering sits close to Toronto’s -18°C; by Whitby the SB-1 value has dropped toward -20°C. Two degrees doesn’t sound like much until it’s the capacity margin on a February design day — and until a plans examiner checks the value on your heat loss report against the local table.
One “GTA” Value for Everything
Contractors quoting across Durham often run every job at Toronto’s -18°C. In Whitby and points east, that undersizes the system on the coldest nights of the year.
Undersized & flaggedSquare-Footage Rule of Thumb
“BTU per square foot” ignores your envelope, your windows, and your exposure. It’s not a CSA F280 calculation and it won’t be accepted with your permit application.
Rejected at intakeCSA F280 at Your Town’s Value
Room-by-room load at the correct SB-1 design temperature for Pickering, Ajax, or Whitby specifically. BCIN-stamped, MVDS and Schedule 1 included.
Accepted first submissionExactly What Durham West Building Departments Expect to See
New builds in Whitby’s north-end subdivisions, additions in Ajax, legal basement apartments across all three towns — the OBC 2024 documentation requirements are the same, and this package covers all of them.
Room-by-Room CSA F280 Heat Loss & Gain
Every room calculated separately at Durham West’s -18 to -20°C design temperature — walls, windows, ceiling, floor, infiltration.
Equipment Sizing Sheet
Right-sized furnace, heat pump, boiler, or AC matched to the calculated load — not a square-footage guess.
Duct or Hydronic Layout Drawings
Fully dimensioned supply and return layout with airflow for every room per HRAI standards.
MVDS & Ventilation Design
The Mechanical Ventilation Design Summary — mandatory on every Ontario new-home permit since January 1, 2025 — plus HRV/ERV selection.
Schedule 1 & BCIN Stamp on Every Page
Signed designer declaration and BCIN stamp throughout — exactly what your Durham building department requires before issuing your permit.
This certified figure tells your HVAC contractor exactly what size furnace or heat pump to install — and it’s the number the plans examiner checks before issuing your permit.
Serving Whitby, Ajax, Pickering & All of Durham
Durham West is one of Ontario’s most active markets for legal basement apartments. A second suite needs its own heat loss calculation, independently controlled heating, and an MVDS — extending the upstairs furnace does not comply. We produce the complete suite package.
Converting to a cold-climate heat pump? Rebate programs require certified CSA F280 sizing, and we verify CCASHP output at your town’s design temperature — the real capacity on design day, not the nominal rating on the box.
Only Need the Heat Loss Report?
The full HVAC design package is $695 flat. If your project only requires the certified CSA F280 heat loss calculation, that’s $395 — same 48-hour delivery.
→ Order a certified heat loss calculationHVAC Design & Permits in Durham West — Answers Before You Ask
The questions Durham West homeowners and builders ask most — answered in plain language.
What design temperature do Whitby, Ajax and Pickering use?
They differ: Pickering and Ajax sit close to Toronto’s -18°C, while Whitby trends colder toward -20°C. We calculate at the correct SB-1 value for your specific municipality — the number the plans examiner checks.
What does a legal basement apartment need for HVAC?
A separate heat loss calculation for the suite, independently controlled heating, an MVDS, and a BCIN-stamped package. Full requirements guide →
Does a furnace replacement need a permit here?
A true like-for-like swap usually doesn’t. Change the fuel, the capacity, or the ductwork — or convert to a heat pump — and it does, with BCIN-stamped documentation. When a replacement needs a BCIN →
How fast can I have the permit package?
Firm quote within 24 hours of uploading your plans; complete BCIN-stamped package within 48 hours of payment. If we miss the 48 hours, it’s free.
Upload Your Plans. Durham West Permit Package in 48 Hours.
Get the certified CSA F280 heat loss and mechanical drawings Whitby, Ajax and Pickering require — calculated at your town’s correct design temperature, with MVDS and Schedule 1 included.
- Free quote — no commitment to buy
- CSA F280 at Durham West’s correct -18 to -20°C design temperature
- MVDS and Schedule 1 included
- BCIN-stamped on every page
- 48-hour delivery after payment