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BC Building Code (Prescriptive Path)
What builders and homeowners need to know about the Prescriptive Path energy-efficiency requirements & exemptions within the BC Building Code.
As a wood door manufacturer, we are often asked the same question by builders and homeowners across British Columbia:
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“Can I still use a real wood door under today’s strict energy-efficiency requirements?”
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The short answer is yes — the BC Building Code (BCBC) makes intentional, well-defined allowances that recognize both the practical and aesthetic value of traditional wood doors. These exemptions ensure that beautiful, durable, natural-wood entry doors remain fully permissible — even in highly energy-efficient homes.
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In this article, we’ll break down what these exemptions are, why they exist, and what they mean for your project.
The BC Building Code (Prescriptive Path) Exemptions That Allow Wood Doors
What Sentence 9 of BCBC 9.36.2.7 Says (Explained in Plain Language)
The intent of 9.36.2.7 Sentence 9 is clear:
Under the prescriptive compliance path of the BCBC (Part 9 housing), 9.36.2.7 Sentence (9) provides exemptions that allow - depending upon the climate zone location of the dwelling - a specified number of exterior doors to be used even if they do not meet minimum U-Value requirements.
As specified in this sentence, homes in:
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any location are allowed one door that has a U-Value not greater than 2.6 W/m2·K if it is the only nonconforming door.
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Climate Zone 4 and 5 (e.g., Lower Mainland, Vancouver Island, Southern Interior, Central and North Coast, and Haida Gwaii) may have up to three nonconforming doors, each of which with an overall U-Value not greater than 2.10 W/m2·K.
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Climate Zone 6 and 7A (e.g., Central Interior, Kootenays, Whistler, Terrace, Peace Region, Rocky Mountains, Inland Northwestern BC) may have up to two nonconforming doors, each of which with an overall U-Value not greater than 2.10 W/m2·K.
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Climate Zone 7B and 8 (e.g., Northern Rockies and extreme north of BC) may have up to two nonconforming doors, each of which with an overall U-Value not greater than 2.00 W/m2·K.
Further exemptions are available with additional attic insulation, above the minimum for that climate zone, of RSI 0.88 (i.e., R-5). For specific information on this additional exemption, the BCBC should be consulted directly.
The BC Building Code (BCBC) makes intentional, well-defined allowances that recognize both the practical and aesthetic value of traditional wood doors.
These exemptions ensure that beautiful, durable, natural-wood entry doors remain fully permissible — even in highly energy-efficient homes.
Table of: Sentence 9 (BCBC 9.36.2.7)
Standard
* with additional attic insulation, above the minimum for that climate zone, of RSI 0.88 (i.e., R-5)
Climate Zone
Prescriptive USI values (W/m2.K)
Exemption as per code text
Number of doors permitted with corresponding USI values (W/m2.K)
4 and 5 (e.g., Lower Mainland, Vancouver Island, Southern Interior, Central and North Coast, and Haida Gwaii)
6 and 7A (e.g., Central Interior, Kootenays, Whistler, Terrace, Peace Region, Rocky Mountains, Inland Northwestern BC)
7B and 8 (e.g., Northern Rockies and
extreme north of BC)
All doors at 1.44 with allowance for one door at 2.6
All doors at 1.84 with allowance for one door at 2.6
All doors at 1.61 with allowance for one door at 2.6
4th
3rd
1st
2nd
1.4
1.4
2.0
2.0
2.1
2.1
2.1*
1.6
2.1
2.1
2.1
2.1*
How Builders can use the Exemption
Under the prescriptive path, compliance is extremely straightforward:
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Specify one exempt door (commonly the main front door), or
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up to the maximum amount allowable depending on the climate zone location of the dwelling.
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All other windows and doors must meet the prescribed U-Values.
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No additional energy modelling or trade-offs are needed.
This is the simplest path for most homes as builders can strategically use the exempt door allowance for:
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Oversized wood entry doors
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Heritage-style exterior doors with decorative glazing
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Custom, handcrafted doors where thermal testing is impractical
This flexibility allows you to meet client expectations without compromising code compliance.
What This Means for Builders
Design Freedom Without Compromising Code Compliance
Builders can confidently specify wood doors for projects without needing to justify energy-performance values.
Better Aesthetics and Customer Satisfaction
Homeowners often prefer the look and feel of real wood for their doors. The exemption allows builders to offer that option without resorting to “work-arounds.”
Simplified Project Planning
Because the exemption is clearly defined, it reduces uncertainty during permitting and inspections.
Guidance for Homeowners
If you're planning a new build or large renovation, you do not need to sacrifice the style, warmth, or craftsmanship of a wood entry door. Sentence 9 ensures that:
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A minimum of one door can be chosen purely for appearance, tradition, or personal preference.
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The exemption applies regardless of the material — solid wood, glazed wood, or custom-built.
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You remain fully compliant with BCBC energy requirements.
What This Means for Homeowners
You Don’t Have to Sacrifice Style for Efficiency
Your home’s entries can feature the warmth, character, and craftsmanship of a real wood door — fully compliant with the BCBC.
A Wood Door Won’t Compromise Your Home’s Energy Efficiency
The impact of one exterior door is minimal when your home is otherwise well-sealed and well-insulated.
Long-Term Durability and Repairability
Unlike many composite doors, quality wood doors can be repaired, refinished, and renewed over time.
What Does the Exemption Not Mean
While the BCBC allows for a specified number of wood doors, it does not mean that any door can be used in any condition. Builders must still ensure:
Proper installation to maintain air-tightness and reduce heat loss around the opening.
NAFS compliance with weatherstripping and threshold systems designed for the local climate.
What if You Want More Than One Wood Door?
Sentence 9 allows up to four exempt door units under the prescriptive path (depending on dwelling climate zone); however, if your design includes multiple wood doors, builders may use:
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The performance path (energy modelling), or
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Trade-offs within the building envelope
These approaches allow multiple wood doors while still achieving full compliance.
Our team regularly works with builders who incorporate five or more wood exterior doors by using the performance path. Please contact us for specific U-Value information required if following the Performance Path.
Understanding Why Wood Doors Are Treated Differently in the BCBC
Energy performance standards for homes continue to rise, and with them, the performance expectations for windows and doors. However, the BC Building Code also acknowledges that:
Wood Doors Serve Functional and Architectural Roles
The Code acknowledges that eliminating wood doors in favour of insulated composite doors would be a loss for architectural diversity as wood doors:
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Offer qualities not easily replicated in other materials
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Provide unique craftsmanship, warmth, and timeless character
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Align with heritage, West Coast, Craftsman, and architectural styles
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Offer superior durability and longevity
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Are preferred in high-end custom homes
Wood Doors Have Minimal Impact on Whole-Home Energy Performance
Exterior doors make up a very small portion of the building envelope. The difference between one — or even a few — solid wood doors compared to foam-insulated doors has negligible impact on the overall energy performance of a home.
Wood doors have a lower energy-cost when evaluated over their entire lifecycle when compared to metal or fibreglass doors with foam cores.
Practicality and Market Reality
Many wood doors cannot achieve the low U-Values mandated within current building codes. These exemptions ensure that homeowners can still choose real wood without forcing manufacturers into unrealistic performance standards.
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Because of these factors, the BCBC includes specific flexibility for exterior doors, particularly when they are decorative, heritage, or have unique aesthetic features.
Put simply: A high-performance home doesn’t become inefficient because of a wood door.
Alternative Method for BCBC Compliance
If a builder uses the performance path (energy modeling) instead of the prescriptive path, there is even greater flexibility.
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This approach uses the overall performance of the building — verified through energy modelling — to demonstrate that the home meets or exceeds the energy-efficiency targets of the prescriptive method.
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This means: components that fall outside prescriptive values, such as multiple wood exterior doors, can still be used as long as the building’s total energy performance remains compliant.
Final Thoughts
The exemptions provided by Sentence 9 of BCBC 9.36.2.7 empower homeowners and builders to choose materials based on aesthetics, tradition, and architectural integrity — not just thermal numbers.
As a wood door manufacturer, we encourage builders and homeowners to take advantage of this code flexibility. It ensures that wood doors remain a viable,
compliant, and beautiful option in energy-efficient homes across British Columbia.
If you’re designing a project and need guidance on using any of the exempt exterior door provisions, we’re here to help.
Our Commitment as a Door Manufacturer
We’ve built our reputation on delivering doors that balance beauty, durability, and regulatory compliance. The BCBC prescriptive energy-efficiency exemption aligns with our long-standing belief that exterior doors must do more than simply insulate — they must welcome, protect, and endure.
Whether you’re a builder navigating code
requirements or a homeowner selecting the front door that will define your home’s character, we’re here to help you make informed, confident decisions.
B.C. Door Company
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DISCLAIMER: This publication is intended for EDUCATIONAL purposes only. The information contained herein is subject to change with no notice, and while a great deal of care has been taken to provide accurate and current information, B.C. Door Co. Ltd., their affiliates, and staff make no claims, representations, or warranties as to accuracy, completeness, usefulness or adequacy of any of the information contained herein. Under no circumstances shall, B.C. Door Co. Ltd., their affiliates, or staff be liable for any losses or damages whatsoever, whether in contract, tort or otherwise, from the use of, or reliance on, the information contained herein. This publication is for educational purposes only and is not intended to provide, and does not constitute, legal or other professional advice. Professional advice and the BCBC (https://www.bccodes.ca/index.html) should be consulted regarding every specific circumstance before acting on the information presented in these materials.