Below-Grade Parking in Halifax's CEN Zones: A Feasibility Framework

Should a Centre-zone (CEN) parcel in Halifax's Regional Centre include below-grade parking? There is no universal answer — it is a parcel-level question that turns on the by-law, the site's physical conditions, the project's economics, and the financing structure. This article lays out the framework a development firm works through before recommending one parking strategy over another, with every regulatory point tied to its primary source.

A few things to establish up front, because the public conversation about this topic is riddled with stale figures:

• The Regional Centre no longer mandates minimum on-site parking for residential development. Parking is now a market and design decision, not a by-law obligation.
• CEN heights and floor-area limits are set per-precinct, not by a single zone-wide number — which directly affects how much building (and therefore how much parking demand) a parcel can support.
• Below-grade parking is materially more expensive than surface or above-grade structured parking, and the gap is driven mostly by site-specific conditions: soil, groundwater, slope, and excavation.
• Federal and CMHC programs can change the math, but none of them turn an unviable underground garage into a viable one on their own.

The job is to compute, parcel by parcel, whether the cost of going below grade is justified by the land it frees up and the rent it supports. Below is how we approach that.

What CEN zoning actually permits — and why it matters for parking

The Centre (CEN) zones cover the highest-density downtown and corridor areas of HRM's Regional Centre — places like Spring Garden, Quinpool, and Gottingen — and are mixed-use by design.[1] The most important thing to understand about CEN is that the tallest permitted heights are governed by precinct-specific height maps in the Regional Centre Land Use By-law (LUB), not by a single zone-wide maximum.[1][2]

This is not a technicality. Anyone publishing "the CEN-2 height limit is X metres" as a general fact is wrong, because the answer is parcel-specific. The authoritative figure for any given lot is the LUB precinct map, confirmed through HRM's ExploreHRM tool.[2] For a development firm, the permitted height and floor-area ratio (FAR) on a specific parcel is the starting input to every other decision — including parking — so we resolve it against the by-law first and never assume it.

Why does this drive parking strategy? Because the more building a parcel can support, the more residents and visitors it generates, and the tighter the surface area becomes. On a downtown CEN lot where the by-law lets you build several storeys of housing, surface parking quickly becomes the most expensive possible use of scarce ground — and that is the condition under which below-grade parking starts to make sense.

Parking is no longer mandatory in the Regional Centre

The single most consequential change to parking strategy in central Halifax is that minimum off-street parking requirements have been removed for residential development in the Regional Centre.[3][1]

Per HRM's own guidance for the Regional Centre's Established Residential zones, no minimum parking is required for residential development; where parking is provided in multi-unit dwellings of five or more units, it must not be located in the front yard, and screening from neighbouring properties is required.[3] The broader Regional Centre LUB carries the same posture across the plan area.[1]

The practical consequence: parking is now a business decision, not a compliance obligation. A developer can build little, some, or no on-site parking based on the parcel's location, the transit and active-transportation network around it, and what the target tenant pool will actually pay for. That freedom is exactly why the question "do we go below grade?" is now worth modelling carefully — the by-law no longer forces a particular answer, so the answer has to be earned with numbers.

As of 2026-06-23, the no-minimum-parking provision for the Regional Centre is established in the current Regional Centre Land Use By-law.[1][3]

A caution on stale information: older write-ups attach specific calendar dates and one-line "since-then" claims to Halifax's parking reforms. The defensible statement is the one above — confirm the current by-law text directly through HRM rather than relying on a remembered effective date.

Site conditions: the real cost driver

Once the by-law permits the building you want and you've decided parking demand justifies structured parking, the question of below-grade vs. above-grade is settled mostly by the dirt. The biggest cost and schedule risks in any underground garage are physical, and they are identified — or missed — long before a shovel hits the ground.

Soil and contamination. A geotechnical investigation establishes whether the soil can support excavation and a below-grade structure, and whether contamination requires remediation. Contaminated material triggers specialized handling and disposal, which adds cost and time. This is the first study we commission, because a poor result can end the below-grade conversation entirely.

Groundwater and the water table. A high or seasonal water table is the classic killer of underground-parking economics in Atlantic Canada. It dictates the waterproofing system, the permanent drainage and pumping regime, and the structural design for hydrostatic pressure. Sites near the harbour or in low-lying areas warrant particular scrutiny.

Slope and stability. A sloped or unstable lot may require shoring, retaining structures, or rock reinforcement. Counter-intuitively, a difficult slope sometimes favours a partially below-grade solution, because cutting into a grade can yield a garage level that would otherwise demand expensive retaining walls for surface parking.

Excavation and unknowns. Buried debris, ledge rock, and unexpected utilities are the cost overruns that don't show up until you dig. Excavated material has to be staged, covered, and disposed of in compliance with environmental rules — large excavations require erosion- and sediment-control measures to keep runoff and sediment out of nearby watercourses.

The discipline here is sequencing: geotechnical and hydrological assessments come before a parking decision is locked, not after. A development firm that commits to below-grade parking and then discovers groundwater has built a budget overrun into the project on day one.

The cost gap — and how to think about it honestly

Below-grade parking is the most expensive way to store a car on a development site. Surface parking is the cheapest; above-grade structured parking sits in between; underground is the top of the range because of excavation, structural mass, waterproofing, ventilation, and life-safety systems.

We are deliberately not publishing a "$X per stall" or "Y-times-more-expensive" multiplier here, because no current Nova Scotia primary source supports a clean, verifiable underground-parking unit cost — and the figures that circulate in general real-estate commentary are usually drawn from other cities and other years. For the cost basis we can stand behind, the proper anchors are construction-cost data published for the Halifax market:

• CMHC's Housing Design Catalogue (Halifax basis, Q1 2025) estimates hard construction cost for small multi-unit buildings at roughly $217,000–$387,000 per unit depending on building type, and about $223–$345 per square foot for small (4–6 unit) multi-unit residential — explicitly hard costs only, excluding land, financing, soft costs, and developer profit, with a recommended 5–10% contingency.[4][5] Structured parking, where included, layers on top of these figures.
• Statistics Canada's Building Construction Price Index shows Halifax residential construction prices still rising: low-rise apartment prices were up 4.0% year-over-year in Q4 2025 (residential overall +3.9%), and the national residential composite rose 2.8% year-over-year in Q1 2026.[6][7] A parking-cost estimate produced even a year ago should be escalated to today before it goes into a pro forma.

The honest framing for an owner is therefore: get a structural and quantity-survey estimate for your parcel's garage, escalate published baselines to the current quarter, and add contingency. A below-grade garage that pencils on a generic per-stall figure can be 30–50% off the real number once a specific site's soil and groundwater are priced in — which is the entire reason site investigation comes first.

How below-grade parking flows through the pro forma

Two things make underground parking earn its place in a financial model: the land it liberates and the rent or sale premium it supports.

On a constrained CEN parcel, moving parking underground converts surface area that would otherwise be asphalt into leasable building footprint, amenity space, or landscaping. In a high-density, transit-accessible context, that recovered area can carry far more value than the cars it replaces. The trade is straightforward to model: compare the net present value of the additional building (or improved building) the freed ground enables against the marginal cost of the below-grade structure.

On the revenue side, secure, weather-protected parking can command a premium and improve absorption in markets where surface parking is impractical — and an Atlantic-Canadian winter is exactly such a market. Whether that premium covers the construction delta is, again, a parcel-level computation, not a rule of thumb.

There is also a tax dimension worth getting right. A rental building acquired after 1987 is generally Capital Cost Allowance (CCA) Class 1, depreciated at 4% per year on a declining-balance basis[8] — and an associated parking structure that forms part of the building is depreciated within that framework rather than expensed. New purpose-built rental buildings can do better: the Accelerated Investment Incentive suspends the half-year rule and provides an enhanced first-year allowance,[9] and an eligible new purpose-built rental building where construction begins on or after April 16, 2024 (and before 2031, available for use before 2036) qualifies for an accelerated 10% CCA rate instead of the usual 4%.[10] None of this makes an unviable garage viable, but it does affect after-tax cash flow and belongs in the model — confirmed with a tax advisor against the project's specific facts.

Ongoing operating reality

A below-grade garage is a long-lived structure that requires active maintenance, and that operating cost belongs in the underwriting from the start. The recurring issues in Atlantic-Canadian underground structures are predictable: water intrusion through failing membranes, chloride-induced corrosion of reinforcing steel from road salt tracked in over the winter, and concrete deterioration. Preventive measures — drainage that is kept clear, periodic washdowns to remove salts and vehicle fluids, restraint on aggressive de-icing chemicals, and routine condition inspections — are far cheaper than the eventual restoration if they're deferred.

For an owner-operator, the relevant point is that the carrying cost of a garage is not just the construction premium; it is the construction premium plus a perpetual maintenance line. A complete feasibility model prices both.

Where financing fits

Financing structure influences the cost of the parking decision but does not determine its feasibility. The relevant federal and CMHC programs, as of 2026-06-23:

• CMHC MLI Select is mortgage loan insurance for multi-unit rental that awards points across affordability, accessibility, and energy efficiency to unlock higher leverage and longer amortization. Projects need a minimum of 5 units, with non-residential space capped at 30% of gross floor area.[11][12] Under the points tiers, 50 points can reach up to 95% loan-to-cost on new construction with up to 40-year amortization; 100 points unlocks up to a 50-year amortization period.[13] Higher leverage and longer amortization reduce the equity and the periodic carrying cost of an expensive build — including its garage — but they are insurance terms, not a construction subsidy.
• CMHC's Apartment Construction Loan Program (ACLP) — the renamed Rental Construction Financing initiative — provides low-interest, fully repayable construction loans for the residential component of purpose-built rental, with loans starting at $1 million, up to 100% loan-to-cost on the residential portion, and up to 50-year amortization, for projects of at least 5 units.[14][15] ACLP is a loan; MLI Select is insurance — they are distinct instruments that can be used together.[16]
• On the tax side, the federal Purpose-Built Rental Housing (PBRH) rebate refunds 100% of the 5% federal GST/HST on qualifying new purpose-built rental (max $35,000/unit), and Nova Scotia mirrors it with a 100% rebate of the 9% provincial part.[17][18] That improves the all-in economics of the building the garage serves — relevant because a structured garage is part of the same project, even though the rebate attaches to the residential units.

The decision rule stands regardless of program: financing changes the cost of capital on a below-grade garage; it does not change whether the garage is the right call for the parcel.

A practical decision sequence

For a Centre-zone parcel in HRM's Regional Centre, the order of operations we follow is:

1. Resolve the by-law for the specific parcel. Confirm the CEN precinct's permitted height and FAR through the Regional Centre LUB and ExploreHRM — never a generalized number.[1][2] This sets the building envelope and therefore the parking demand.
2. Treat parking as optional, then size it to the market. With no minimum mandated,[3] decide how much parking the location, transit access, and tenant pool actually justify — which may be zero.
3. Investigate the site before choosing a structure type. Geotechnical and hydrological studies determine whether below-grade is even sensible, and at what cost.
4. Model surface vs. structured vs. below-grade on the parcel's own numbers. Compare freed-ground value and rent premiums against escalated, contingency-loaded construction estimates anchored to Halifax-basis data.[4][6][7]
5. Layer in financing and tax. Apply MLI Select / ACLP terms and the PBRH rebate and accelerated CCA to the after-tax, after-financing picture.[10][13][17]
6. Underwrite the operating cost of the garage for its full life, not just its construction.

Below-grade parking is a legitimate and sometimes decisive tool on a dense, constrained downtown parcel. It is also one of the easiest line items to get wrong — by importing an out-of-market cost figure, by skipping the geotechnical work, or by assuming a parking minimum that no longer exists. The right answer is computed from the parcel up, against current Halifax rules and Halifax-basis costs, with the dirt priced honestly.

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Sources

1. Halifax Regional Municipality — Regional Centre Plan Area / Regional Centre Land Use By-law: https://www.halifax.ca/about-halifax/regional-community-planning/community-plan-areas/regional-centre-plan-area
2. Halifax Regional Municipality — Regional Centre Land Use By-law (full by-law text): https://www.halifax.ca/media/75717
3. Halifax Regional Municipality — HAF Amendments: Permitted Uses, Regional Centre Established Residential Zones (June 2024 fact sheet): https://cdn.halifax.ca/sites/default/files/documents/about-the-city/regional-community-planning/er-zones-fact-sheet-june-2024.pdf
4. CMHC — Housing Design Catalogue, Construction Cost Estimate Summary (Atlantic / Halifax basis, Q1 2025): https://assets.cmhc-schl.gc.ca/sites/housing%20catalog/resources/hdc-construction-cost-estimate-summary-atlantic-en.pdf
5. CMHC — Housing Design Catalogue (Atlantic) — Costing Notes (hard costs only; +5–10% contingency; excludes land/financing/soft/developer profit): https://assets.cmhc-schl.gc.ca/sites/housing%20catalog/resources/hdc-construction-cost-estimate-summary-atlantic-en.pdf
6. Nova Scotia Department of Finance — Building Construction Price Index, Q4 2025 (reporting Statistics Canada Table 18-10-0289-01): https://novascotia.ca/finance/statistics/archive_news.asp?id=21693&dg=&df=&dto=0&dti=3
7. Statistics Canada — The Daily: Building construction price indexes, Q1 2026: https://www150.statcan.gc.ca/n1/daily-quotidien/260428/dq260428b-eng.htm
8. Canada Revenue Agency — Classes of depreciable property (Class 1, 4% declining-balance): https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/sole-proprietorships-partnerships/report-business-income-expenses/claiming-capital-cost-allowance/classes-depreciable-property.html
9. Canada Revenue Agency — Accelerated Investment Incentive: https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/sole-proprietorships-partnerships/report-business-income-expenses/claiming-capital-cost-allowance/accelerated-investment-incentive.html
10. Budget 2024 — Tax Measures: Supplementary Information (Accelerated CCA for Purpose-Built Rental Housing, 10% rate): https://www.budget.canada.ca/2024/report-rapport/tm-mf-en.html
11. CMHC — MLI Select: https://www.cmhc-schl.gc.ca/professionals/project-funding-and-mortgage-financing/mortgage-loan-insurance/multi-unit-insurance/mliselect
12. CMHC — MLI Select (minimum 5 units; non-residential ≤30% of gross floor area): https://www.cmhc-schl.gc.ca/professionals/project-funding-and-mortgage-financing/mortgage-loan-insurance/multi-unit-insurance/mliselect
13. CMHC — MLI Select program guide (point tiers: 50 pts → up to 95% LTC / 40-yr; 100 pts → up to 50-yr amortization): https://assets.cmhc-schl.gc.ca/sites/cmhc/professional/project-funding-and-mortgage-financing/mortgage-loan-insurance/multi-unit-insurance/mliselect/mli-select.pdf
14. CMHC — Apartment Construction Loan Program (formerly Rental Construction Financing initiative): https://www.cmhc-schl.gc.ca/professionals/project-funding-and-mortgage-financing/funding-programs/all-funding-programs/apartment-construction-loan-program
15. CMHC — ACLP: Standard Rental Housing (min $1M loan; up to 100% LTC residential; up to 50-yr amortization; min 5 units): https://www.cmhc-schl.gc.ca/professionals/project-funding-and-mortgage-financing/funding-programs/all-funding-programs/apartment-construction-loan-program/standard-rental-housing
16. CMHC — Mortgage Loan Insurance for Multi-Unit and Rental Housing (ACLP vs MLI Select are distinct instruments): https://www.cmhc-schl.gc.ca/professionals/project-funding-and-mortgage-financing/mortgage-loan-insurance/multi-unit-insurance
17. Canada Revenue Agency — GST/HST Purpose-Built Rental Housing (PBRH) Rebate (100% of federal GST; max $35,000/unit): https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/gst-hst-businesses/gst-hst-rebates/purpose-built-rental-housing.html
18. Government of Nova Scotia — Department of Finance, Purpose-Built Rental Housing Rebate (100% of the 9% provincial part of HST): https://novascotia.ca/finance/en/home/taxation/tax101/harmonizedsalestax/purpose-built-rental-housing-rebate.html