HVAC Design London Ontario — Complete Mechanical Drawings for Your Permit. Conversions & Additions a Specialty. BCIN-Stamped. 48 Hours.
Upload your floor plans today. Get a firm quote in 24 hours. Receive duct design, mechanical drawings, MVDS and the CSA F280 heat loss calculation — the full package the City of London requires, from Old North conversions to new builds in the growth corridors.
London Approved Fourplexes Citywide — and Reviews Every Unit’s Mechanical Design
London’s as-of-right four-unit zoning plus two university-driven rental markets make it one of Ontario’s busiest conversion cities. The pattern the city’s examiners see constantly: a 1920s Old North house split into three or four units, with a permit application that shows the floor plan but not the mechanical design. Since OBC 2024, that application doesn’t move — each unit needs its own CSA F280 numbers, independently controlled heating on a drawing, an MVDS, and a Schedule 1. Meanwhile the growth corridors in the northwest and southeast run a parallel stream of new builds and additions reviewed to the same standard.
Conversion Plans With No Mechanical Design
A floor plan showing four units tells the examiner nothing about how each is heated and ventilated. Applications without per-unit mechanical documentation are London’s most common residential resubmission.
Returned at intakeBasement Units Off the House Furnace
A basement rental heated by the upstairs furnace’s spare capacity isn’t a legal unit — it needs independently controlled heat, its own load numbers, and its own ventilation, all documented.
Does not complyComplete BCIN Mechanical Package
Per-unit CSA F280 at -18°C, duct design with per-room CFM, equipment selection, MVDS and Schedule 1 — stamped and formatted for City of London submission.
Accepted first submissionExactly What the City of London Expects to See
Multi-unit conversions in Old North and around both campuses, additions across the established neighbourhoods, and new builds in the northwest and southeast growth areas — one complete mechanical package.
Room-by-Room CSA F280 Heat Loss & Gain
Every room calculated separately at London’s -18°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 the City of London requires before issuing your permit.
Four units means four independent designs under one roof — each with its own load numbers, its own control, its own fresh air. That’s the documentation set London reviews, unit by unit.
Serving London, St. Thomas, Strathroy & Middlesex
London’s conversion economy runs on complete documentation: the city wants per-unit calculations, drawn distribution, and ventilation design before a multi-unit permit moves. We produce the full BCIN-stamped set from your conversion drawings in 48 hours.
Additions and new builds get the same room-by-room treatment at -18°C — and where a heat pump or hybrid is the plan, the design documents the balance point and backup sizing, which doubles as the rebate paperwork.
Only Need the Heat Loss Report?
The full HVAC design package is $695 flat. If your London project only requires the certified CSA F280 heat loss calculation, that’s $395 — see the London heat loss page. Same 48-hour delivery.
→ Order a certified heat loss calculationHVAC Design & Permits in London — Answers Before You Ask
The questions London homeowners and builders ask most — answered in plain language.
What’s the difference between this and the $395 heat loss report?
The $395 report is the certified CSA F280 calculation only. The $695 package adds per-unit duct design, equipment selection, ventilation design with MVDS, and stamped mechanical drawings — the set London reviews on conversions and new builds. Just need the report? →
What does a London fourplex conversion need for HVAC?
Per-unit CSA F280 calculations, independently controlled heating for each unit shown on drawings, an MVDS per dwelling unit, and a signed Schedule 1 — all BCIN-stamped. We produce the complete set from your conversion plans.
Can a student rental basement unit stay on the house furnace?
Not as a legal unit — it needs independently controlled heating, its own heat loss numbers, and its own ventilation. A ductless cold-climate heat pump is often the cleanest retrofit, and we design and document it as part of the package.
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. London Permit Package in 48 Hours.
Get the duct design, mechanical drawings and certified CSA F280 calculation the City of London requires — conversions, additions and new builds, BCIN-stamped throughout.
- Free quote — no commitment to buy
- CSA F280 at London’s correct -18°C design temperature
- MVDS and Schedule 1 included
- BCIN-stamped on every page
- 48-hour delivery after payment