Low-Carbon Construction in Halifax: What Sustainable Building Now Means for HRM Development

"Sustainable construction" is one of those phrases that can mean almost nothing or almost everything. For a parcel owner or institutional partner weighing what to build in the Halifax Regional Municipality (HRM), the useful version of the question is narrower and more consequential: as of 2026, what does the regulatory and financing environment actually require and reward on the energy and carbon side — and how does that change what a given site can support?

Helio is a technology-led real estate company in Halifax. We don't build buildings ourselves or quote a price for them; established builders deliver the construction, and official and market figures set the costs. What we do is compute the most a parcel can responsibly become and coordinate its delivery under a defined mandate on land our clients own. Energy performance, accessibility, and carbon are not bolt-ons to that calculation — they sit inside the building code, inside the approvals path, and inside the capital stack. This article lays out the parts that are now codified in Nova Scotia and HRM, with each material claim cited to its primary source.

The energy code is no longer optional — and it is tightening on a schedule

The single largest change to "sustainable construction" in Nova Scotia is that energy performance is now law, not aspiration, and it ratchets up year by year.

Effective April 1, 2025, Nova Scotia adopted the 2020 editions of the National Building Code of Canada (NBC 2020), the National Energy Code of Canada for Buildings (NECB 2020), and the National Plumbing Code of Canada (NPC 2020), under N.S. Reg. 198/2024 [1]. The codes are provincial law, but permits, inspections, and occupancy approvals are administered municipally — in HRM, by the municipality's Planning & Development office — so the rules are uniform while the paperwork is local [2].

Crucially, Nova Scotia is phasing the energy provisions in by tier rather than switching them on all at once. The published schedule is [1]:

• Building code Tier 1 and energy code Tier 1 — effective April 1, 2025
• Building code Tier 2 — effective April 1, 2026
• Energy code Tier 2 — effective April 1, 2027
• Building code Tier 3 — effective April 1, 2027
• Energy code Tier 3 — effective April 1, 2029

For houses and small buildings governed by Section 9.36 of the code, at least Tier 2 of the tiered energy-performance and prescriptive requirements for climatic Zone 6 applies as of April 1, 2026, having phased in from Tier 1 a year earlier [3].

The practical implication for a development on the boards in 2026 is that the energy target a building must hit is a moving target tied to its construction date — and a project that takes two or three years from feasibility to occupancy may be designed against one tier and completed under a stricter one. This is precisely the kind of timing variable that belongs in a feasibility model from day one rather than discovered during permit review. (Note as of 2026-06-23: the tier dates above are the province's announced schedule and are subject to provincial amendment.)

Part 9 versus Part 3: the threshold that quietly governs cost and complexity

Energy performance interacts with another code distinction that shapes what a parcel can carry. Under the NBC as adopted in Nova Scotia, a building qualifies for the simpler Part 9 ("Housing and Small Buildings") path only if it is three storeys or fewer in building height, has a building area of no more than 600 m² (about 6,460 sq ft), and is not an excluded major occupancy (assembly, care/treatment/detention, or high-hazard industrial). Exceed either size threshold, or fall into an excluded occupancy, and the building becomes a Part 3 building [4].

That line matters because Part 3 buildings carry more demanding fire-safety, structural, and energy-modelling requirements — and therefore more design and consultant cost. A parcel that could host either a six-unit Part 9 form or a slightly larger Part 3 form is not facing a small decision; it is facing two materially different cost and timeline structures. Computing where a site lands relative to that 600 m²/three-storey threshold is part of figuring out what it can actually support.

Accessibility is now a parallel design standard

Sustainability in the broad sense — buildings people can use over a lifetime — also picked up new force in Nova Scotia. The province's Built Environment Accessibility Standard Regulations (N.S. Reg. 48/2025, under the Accessibility Act) apply technical design requirements to built-environment elements that are newly constructed, newly installed, or redeveloped where construction or installation begins on or after April 1, 2026. Private residences with three or fewer dwelling units are explicitly excluded, as are aspects already governed by the Building Code and Fire Safety Regulations [5].

Separately, the building code itself already requires that at least one entrance to a building be barrier-free, with a barrier-free path of travel within normally occupied floor areas on the entrance level, in any storey exceeding 600 m², and in any storey served by a passenger elevating device [6].

For a four-plus-unit project — which is now the as-of-right default on every centrally serviced residential lot in HRM after the June 2024 Housing Accelerator Fund amendments [7] — accessibility is therefore a live design input, not an afterthought, the moment a project crosses out of the three-unit exclusion.

Where carbon performance turns into capital: CMHC MLI Select

The reason "low-carbon" is not merely a compliance cost is that the financing system now explicitly pays for it. CMHC's MLI Select — the multi-unit mortgage loan insurance product — awards points across three social-outcome categories: affordability, accessibility, and climate compatibility (energy efficiency). Hitting point thresholds unlocks reduced premiums, higher leverage, and longer amortization [8].

On the climate side, MLI Select rewards measurable performance over baseline code, not gestures. For new construction, the program looks for energy and greenhouse-gas performance improvements in the range of roughly 25% to 70% better than the national building codes, with photovoltaic systems capped at 15% of the qualifying reduction so that solar can complement but not substitute for genuine conservation [8].

The point thresholds and what they unlock are tiered [9]:

• 50 points → up to 95% loan-to-cost on new construction with up to 40-year amortization
• 70 points → up to 95% loan-to-value on existing properties with up to 45-year amortization
• 100 points → up to a 50-year amortization period

And under CMHC's updated premium-discount schedule effective July 14, 2025, 50 points earns a 10% premium discount, 70 points earns 20%, and 100 points earns 30% [10]. MLI Select projects must contain a minimum of five units (50 units/beds for retirement homes), with non-residential space capped at 30% of gross floor area [11].

The point is not that every project should chase 100 points — it is that energy performance, accessibility, and affordability are now priced into the terms of the debt. A building designed to clear an energy threshold isn't just cheaper to operate; it can change the amortization and leverage that make the project viable in the first place. That trade-off — what a higher-performance envelope costs versus what it returns in financing terms — is exactly the kind of thing a feasibility computation should resolve before a shovel moves.

MLI Select is mortgage loan insurance; it is distinct from CMHC's Apartment Construction Loan Program (ACLP, formerly the Rental Construction Financing initiative), which is a direct low-interest construction loan for the residential component of a rental project. They can be used together, but they are different instruments [12].

The tax and incentive layer also leans toward purpose-built rental

Two further mechanisms reward building, and building rental specifically. New, eligible purpose-built residential rental buildings qualify for an accelerated Capital Cost Allowance rate of 10% (against the usual 4% Class 1 rate) where construction begins on or after April 16, 2024, before 2031, and the building is available for use before 2036 [13]. And the federal Purpose-Built Rental Housing rebate refunds 100% of the GST (the 5% federal part of HST) on qualifying new purpose-built rental, to a maximum of $35,000 per unit, with Nova Scotia mirroring it by rebating 100% of the 9% provincial part of HST on qualifying projects [14].

On the operating-efficiency side, the program landscape shifts and should be checked at the time of underwriting. As of 2026-06-23: Efficiency Nova Scotia's Affordable Housing Energy Program for affordable multifamily rental is reported open [15], as is its Commercial New Construction program (which serves multi-unit residential projects of at least 15,000 ft² in pre-construction design) [16]. By contrast, the residential SolarHomes rebate closed to homeowner applications on April 17, 2025 [17], and the Canada Greener Homes Grant is closed entirely [18]. Treat any incentive as a variable, not a constant.

What this means for a parcel

Put together, "sustainable construction" in HRM in 2026 is less a marketing posture than a set of codified inputs that move a development's numbers:

• The energy target depends on the construction date because the code tier ratchets up on schedule [1][3].
• The Part 9/Part 3 line at three storeys and 600 m² governs design and consultant cost [4].
• Accessibility becomes a hard design input above three units, both under the building code and the new Built Environment standard [5][6].
• Energy and carbon performance are priced into financing through MLI Select's points, premiums, and amortization, with the strongest rewards reserved for measured improvement over code [8][9][10].
• The tax and rebate stack tilts toward purpose-built rental, materially affecting after-tax returns [13][14].

None of this is captured by a single per-unit cost figure or a generic "green building" claim. It is the kind of multi-variable problem — code tier by date, occupancy threshold by size, financing points by performance, rebates by structure — that determines what a given Halifax parcel can responsibly become. Establishing that, and then structuring and coordinating the development on land our clients already own, is the work.

---

Sources

1. Government of Nova Scotia — News Release, "Province to Adopt 2020 National Building Codes" (Sept 20, 2024): https://news.novascotia.ca/en/2024/09/20/province-adopt-2020-national-building-codes
2. Halifax Regional Municipality — Building Code & Regulatory Information: https://www.halifax.ca/home-property/building-development-permits/building-code-regulatory-information
3. Government of Nova Scotia — Building code tier phase-in (per the Sept 20, 2024 release) + Nova Scotia Building Code Regulations §9.36 (Subsections 9.36.7/9.36.8): https://news.novascotia.ca/en/2024/09/20/province-adopt-2020-national-building-codes
4. National Research Council Canada — Illustrated User's Guide, NBC 2020 Part 9 (Division B), Housing and Small Buildings: https://nrc.canada.ca/en/certifications-evaluations-standards/codes-canada/codes-canada-publications/illustrated-users-guide-national-building-code-canada-2020-part-9-division-b-housing-small-buildings
5. Built Environment Accessibility Standard Regulations, N.S. Reg. 48/2025 (Accessibility Act): https://novascotia.ca/just/regulations/regs/accbuiltenviro.htm
6. Halifax Regional Municipality — Accessible / Barrier-Free Entrance Design Guidelines (per National Building Code Section 3.8): https://cdn.halifax.ca/sites/default/files/documents/home-property/building-renovating/2024.01-barrier-free-entrance-guidelines-v1.03.pdf
7. Halifax Regional Municipality — Recent changes to planning documents for housing (Housing Accelerator Fund): https://www.halifax.ca/about-halifax/regional-community-planning/housing-accelerator-fund/urgent-changes-planning-0
8. CMHC — MLI Select: https://www.cmhc-schl.gc.ca/professionals/project-funding-and-mortgage-financing/mortgage-loan-insurance/multi-unit-insurance/mliselect
9. CMHC — MLI Select (program PDF): https://assets.cmhc-schl.gc.ca/sites/cmhc/professional/project-funding-and-mortgage-financing/mortgage-loan-insurance/multi-unit-insurance/mliselect/mli-select.pdf
10. CMHC — Notice: CMHC to Update Multi-Unit Mortgage Loan Insurance Premiums (effective July 14, 2025): https://www.cmhc-schl.gc.ca/media-newsroom/notices/2025/cmhc-to-update-multi-unit-mortgage-loan-insurance-premiums
11. CMHC — MLI Select (minimum units / non-residential cap): https://www.cmhc-schl.gc.ca/professionals/project-funding-and-mortgage-financing/mortgage-loan-insurance/multi-unit-insurance/mliselect
12. CMHC — Mortgage Loan Insurance for Multi-Unit and Rental Housing / Apartment Construction Loan Program: https://www.cmhc-schl.gc.ca/professionals/project-funding-and-mortgage-financing/funding-programs/all-funding-programs/apartment-construction-loan-program
13. Budget 2024 — Tax Measures: Supplementary Information (Accelerated CCA for Purpose-Built Rental Housing): https://www.budget.canada.ca/2024/report-rapport/tm-mf-en.html
14. Canada Revenue Agency — GST/HST Purpose-Built Rental Housing (PBRH) Rebate; Government of Nova Scotia, Department of Finance — Purpose-Built Rental Housing Rebate: https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/gst-hst-businesses/gst-hst-rebates/purpose-built-rental-housing.html
15. Efficiency Nova Scotia — Affordable Housing Energy Programs: https://www.efficiencyns.ca/programs-rebates/affordable-housing-energy-programs
16. Efficiency Nova Scotia — Commercial New Construction: https://www.efficiencyns.ca/programs-rebates/commercial-new-construction
17. Efficiency Nova Scotia — SolarHomes: https://www.efficiencyns.ca/programs-rebates/solarhomes
18. Natural Resources Canada — Closed: Canada Greener Homes Grant (Nova Scotia): https://natural-resources.canada.ca/energy-efficiency/home-energy-efficiency/canada-greener-homes-initiative/closed-canada-greener-homes-grant-nova-scotia