Heat Loss Calculation London
CSA F280 heat loss calculations for London building permits, at the correct OBC design temperature for Southwestern Ontario — BCIN-stamped, accepted by the City of London Building Division, delivered in 48 hours.
A London building permit requires a CSA F280 heat loss calculation at London OBC January 2.5% design temperature of -18°C (Supplementary Standard SB-1). London shares the GTA-range design temperature, but the report must still cite London own SB-1 value. We deliver a BCIN-stamped report with the MVDS and Schedule 1, formatted for the City of London building portal. From $395, delivered in 48 hours.
London design temperature: -18°C
Under OBC Section 9.33.2.2, your CSA F280 calculation must use London official January 2.5% heating design temperature from Supplementary Standard SB-1: -18°C (about 3,900 heating degree-days below 18°C). London shares the GTA-range design temperature, but the report must still cite London own SB-1 value. Using the wrong design temperature is the single most common reason Ontario heat loss reports are returned, so we confirm the SB-1 value for your exact project location before calculating. Confirm yours with our free design temperature lookup.
What a London HVAC permit package needs
A complete London building permit package includes a CSA F280 heat loss report at -18°C, mechanical drawings (duct or hydronic layout and equipment schedule), the MVDS ventilation summary (mandatory under OBC 2024), and the Schedule 1 designer declaration — every page BCIN-stamped. A missing piece is the top rejection cause; see our permit requirements guide.
London permit submission
London building permit applications are submitted through the City of London online building permit portal. BCIN is a provincial credential, so we serve London from anywhere in Ontario — we confirm your design temperature, produce the full BCIN-stamped package, and format it for submission. Free quote within 24 hours of uploading your plans.
Heat Loss Calculations in London — FAQ
What design temperature is used for a heat loss calculation in London?
London uses an OBC January 2.5% heating design temperature of -18°C, from Supplementary Standard SB-1. This is the value your CSA F280 calculation and equipment sizing must use for a building permit. We confirm the exact SB-1 value for your project location before calculating.
How much does a heat loss calculation cost in London, and how fast?
Our certified CSA F280 heat loss reports start at $395 flat, BCIN-stamped, with a firm quote within 24 hours of uploading plans and delivery within 48 hours of payment. A full HVAC design package with mechanical drawings starts at $695.
Who can sign the heat loss calculation for my London permit?
For an Ontario permit the CSA F280 report must be signed by a BCIN-registered designer (HVAC-House category) or a licensed P.Eng., with the BCIN number on every page. An HVAC contractor cannot sign unless they personally hold that registration. We are BCIN-registered and serve London province-wide.
Do you serve London if you are not located there?
Yes. BCIN is a provincial credential, so a registered HVAC-House designer can prepare and stamp documents for any Ontario municipality, including London. We confirm your design temperature from SB-1, produce the full package, and format it for the City of London building portal. Delivered in 48 hours.
Related Services & Guides
Building in London? Get your heat loss report in 48 hours.
Upload your plans and we confirm London SB-1 design temperature (-18°C), produce the BCIN-stamped CSA F280 and full permit package, and format it for the City of London building portal.