
Multigenerational & In-Law Suite Renovation in Hamilton: Design, Cost & What It Actually Takes
28 August 2026Hamilton just secured $572 million to eliminate development charges on new homes for three years, here’s exactly what’s confirmed, what’s still pending, and what it means for your project in the Greater Hamilton Area.
On August 26, 2026, the City of Hamilton was awarded up to $572 million through the federal–provincial Development Charge Reduction Program (DCRP), in exchange for committing to eliminate residential development charges for three years. The elimination is not yet in effect, it still needs Hamilton City Council’s approval and two intergovernmental agreements before it becomes law. Once in force, the government estimates the full removal could cut the cost of building a new home by up to $100,442.
That’s the headline everyone’s repeating. But if you own a home in the Greater Hamilton Area, or you’re weighing a multi-unit build, the headline isn’t the question you’re actually asking. You’re asking: does this apply to my project, how much does it really change my numbers, and are there catches?
This guide answers all of that including two things most coverage skips. First, a large share of Hamilton homeowners adding a second suite were already exempt from most development charges before any of this was announced. Second, eliminating development charges does not make a project fee-free. We build these projects, so we’ll give you the honest version.
What Are Development Charges?
Development charges (DCs) are one-time fees a municipality collects when a building permit is issued, to help pay for the infrastructure that growth requires roads, water and sewer systems, transit, fire and police services. The principle: “growth pays for growth.” On some project types, a DC has run close to six figures so, a full elimination genuinely moves the numbers on the projects that pay it in full.
What Was Actually Announced?
Hamilton will receive up to $572,040,664 through the DCRP, tied to eliminating development charges on all residential development from March 30, 2026 to March 31, 2029. The City of Hamilton’s own release confirms the same figures and calls it the single-largest infrastructure investment in the city’s history.
Funds Infrastructure, Not a Cheque to Builders: The $572M pays for roads and water/wastewater capacity. It backfills the gap created by eliminating the fee, it isn’t handed to developers.
Hamilton Went the Furthest: The program rewards cities cutting DCs 30-50%+. Hamilton committed to 100% elimination called the strongest application submitted, of 200+ Ontario municipalities that levy DCs. Minister Rob Flack put it bluntly to CBC News: “Hamilton got rid of them 100 per cent, so that gave [them] the gold star.” Asked how Hamilton’s application compared to others, Flack said, “Full stop, it was the best application we received under the DCRP.

Is It In Effect Yet?
No. Hamilton has not yet stopped charging residential development charges. Three things still need to happen:
- Hamilton City Council approval of the full elimination by by-law.
- Canada–Ontario BCSF bilateral agreement signed.
- Ontario–municipal Transfer Payment Agreement signed.
Until those close, current rules still apply to permits issued today. The commitment is designed to be retroactive to March 30, 2026 once in force, but don’t make a build-or-wait decision on a program that isn’t law yet.
The Full Timeline (2025 → 2029)
| Date | What Happened |
|---|---|
| Sept 2025 | Temporary 20% reduction applied city-wide, all residential + non-residential. |
| May 2026 | Council voted 13–3 to add a further temporary exemption, offsetting 2026 indexing. |
| June 1, 2026 | Amended DC by-law with updated exemptions took effect. |
| Aug 26, 2026 | $572M DCRP award announced; 3-year full elimination committed, not yet in force. |
| Pending | Hamilton City Council approval of the full elimination. |
| Pending | Canada–Ontario BCSF bilateral agreement signed. |
| Pending | Ontario–municipal Transfer Payment Agreement signed. |
| Mar 31, 2029 | End of the committed three-year elimination window. |
What Would You Pay Today? (Real Current Rates)
The $572M elimination isn’t law yet, so here’s what still applies under the by-law in effect June 1, 2026–May 31, 2027, sourced directly from the City’s official DC pamphlet. Today’s rate = full DC rate minus a combined 24% temporary exemption (20% + 4%).
| Unit Type | Rural Area | Combined Sewer (Urban A) | Separated Sewer (Urban A) | Separated Sewer (Urban B) |
|---|---|---|---|---|
| Single/Semi-Detached | $44,415 | $89,729 | $102,451 | $81,303 |
| Townhouse/Other Multiple | $33,149 | $66,970 | $76,467 | $60,683 |
| 2+ Bedroom Apartment | $27,226 | $55,007 | $62,807 | $49,842 |
| 1 Bedroom/Bachelor Apartment | $16,874 | $34,087 | $38,919 | $30,886 |
Apply the current 24% exemption and a single/semi-detached home in Hamilton’s most common urban area works out to roughly $77,000–$78,000 payable today. On top: Education DCs, currently $2,040/unit (public board) and $1,539/unit (Catholic board) and any applicable Special Area Charge (e.g. Dundas/Waterdown, ~$1,931/unit), neither reduced by City exemptions. Rental housing gets its own separate 15–25% exemption scaled to bedroom count.
What Does the Elimination Actually Save?
The DC saving: up to $100,442 per home the government’s estimate for a full elimination on a new home, meant to be passed on to new homebuyers, not retained at the development stage.
A separate HST relief of up to $130,000 exists too (its own program, own rules: see below). Combined: up to $230,000 off a new home. That’s a new-home-purchase ceiling not automatic for a renovation, a second suite, or every build.
The Catch Most Coverage Misses: Not Fee-Free
Even a full elimination leaves several charges in place, in the City’s own words:
Education DCs: $2,040/unit (public), $1,539/unit (Catholic). Set by school boards, not the City: City DC policy does not affect these.
Special Area Charges: ~$1,931/unit where applicable (e.g. Dundas/Waterdown). Not covered by City DC exemptions.
Parkland Dedication: Separate and distinct from development charges.
Community Benefits Charges: Apply to larger buildings broadly 5+ story and 10+ units.
None of this cancels the opportunity, it sharpens it. Protect your budget by getting every applicable charge identified for your specific project before you commit.
Where Is the $572M Going?

| Project | What It Does | Expected Start |
|---|---|---|
| Woodward Wastewater Treatment Plant | Expansion capacity for up to 97,000 additional homes | 2028 |
| Greenhill Water Pumping Station | Upgrade capacity for up to 4,400 additional homes | 2027 |
| Barton St (Fruitland Rd–Fifty Rd) | Widened to a five-lane multi-modal arterial | 2029 |
| Lewis Rd (Hwy 8–Barton St) | Reconstructed and urbanized | 2027 |
| Rymal Rd (Glancaster–Upper Paradise / Upper James–Dartnall) | Widened to a five-lane arterial | 2028 |
| Garner Rd (Wilson St–Glancaster Rd, Ancaster) | Widened to a five-lane arterial | To be confirmed |
Combined with the DC elimination, the City estimates this unlocks over 31,000 new homes. Hamilton recorded 4,074 housing starts in 2025 already 65% above 2024. Municipalities must contribute at least 10% of project costs.
What This Means for Hamilton Homeowners
If your plan is a legal second suite or basement apartment: Hamilton already exempts up to two secondary dwelling units added to an eligible single-detached, semi-detached, or row house one of which can be detached from development charges. That exemption predates this announcement.
The real takeaway isn’t “you saved $100,000 on your basement.” It’s that permits, design, and doing it to code the first time are your actual cost drivers not a DC you were probably already exempt from. That’s where the right builder protects your money.
→ See If Your Basement Qualifies for a Legal Suite
What This Means for Investors and Multi-Unit Builders
This is where the change actually has teeth. New construction, infill, and any triplex, fourplex, or additional unit that would otherwise attract full development charges is squarely what this program targets. Hamilton’s low-density residential zones already permit up to four units per lot one more than the provincial Bill 23 minimum of three but the DC by-law hasn’t caught up: that fourth unit still attracts full development charges under current rules, and Gateway’s founder Charles Wah has personally delegated to the City on exactly this gap.
How much is a Hamilton DC per unit, in practice? Speaking on the Real Estate Tax Tips podcast, Charles put real numbers on it: development charges alone can run $30,000 or more per unit, and for that specific fourth unit the one Hamilton allows but still charges for clients have seen $80,000 to $100,000 in combined development charges, parkland dedication, and miscellaneous municipal fees, for one additional unit. That applies even to something as simple as a garage conversion adding a fourth unit to a lot that already has three.
Real numbers: a Hamilton fourplex, ground-up. Charles walked through an active Gateway project on the podcast a client bought an old Hamilton Mountain bungalow for roughly $400,000, delayed closing to start permitting and design work early, and Gateway broke ground on a brand-new fourplex after the teardown. Rough figures shared:
- Construction cost: approximately $250–$275 per square foot (up to $300 for higher-end finishes)
- All-in project cost: land (~$400K) + construction (~$800K) + soft costs, permits, and DCs (~$150K) ≈ $1.35 million
- Estimated combined rent across all 4 units: $8,000–$10,000/month
- Estimated mortgage (30-year amortization): roughly $5,000/month, plus a few thousand more in carrying costs
- Timeline: roughly 8–9 months from groundbreaking to completion
The financing wrinkle that changes the math: CMHC needs 5+ units. A standalone fourplex doesn’t qualify for CMHC’s lower-cost, long-amortization financing you need a minimum of five units, even across adjacent lots, as long as the buildings are attached. Charles shared a real example of why this matters: on a legally severed semi-detached property, the City of Hamilton had been interpreting the two sides as one property, capping it at four units total. After dialogue between Hamilton’s WEHBA Missing Middle and Infill Subcommittee and City staff, Hamilton corrected that interpretation to three units per side six units total which crossed the CMHC threshold and, in Charles’s words, was the difference between that project happening and not happening at all.
Most clients finance construction conventionally a bank or credit union, at roughly prime + 2% to prime + 3%, covering about 75% of hard and soft costs, released in draws as construction stages are verified. Private financing is faster with less paperwork but generally more expensive.
One appraisal issue worth knowing about early: because there aren’t many comparable new-build missing-middle sales in Hamilton yet, appraisers tend to be conservative. A project that might be “worth” $1.5 million on paper could appraise closer to $1.35 million simply due to a thin comparable pool which affects how much capital you can pull back out on refinance. Budget conservatively and treat anything above that as upside.
What’s Still Pending The exact treatment of the fourth-and-additional units in a multiplex under the finalized $572M-linked by-law. This is the number that moves a fourplex pro forma the most. Gateway’s founder Charles Wah chairs WEHBA’s Missing Middle & Infill Subcommittee and tracks this directly this section updates the moment the by-law confirms fourth-unit treatment, so bookmark this page rather than searching for the answer elsewhere.
If you’re evaluating a duplex, triplex, or fourplex build in Hamilton right now, this is the moment to run real numbers. Gateway Group is a Hamilton based multi-unit conversion contractor and fourplex builder, and we’re already pricing projects against these exact changes for clients converting single-family homes into duplexes and triplexes, and building new fourplexes from the ground up. Whether you’re comparing the cost to build a fourplex in Hamilton against a triplex conversion, or trying to work out what a duplex conversion actually costs once development charges are factored in, the answer depends on your specific lot, zoning, and unit mix not a generic per-square-foot number. That’s the conversation worth having before you commit to a design or a purchase.
→ Run Real Numbers on a Fourplex Build
The HST Question (A Separate Program)
The $130,000 figure is not a development charge — it’s a separate HST relief on new homes, and unlike the DC elimination, this one is now fully in force. Ontario’s enabling legislation, Bill 114, the HST Relief Implementation Act, received Royal Assent on May 12, 2026, with the corresponding federal and provincial regulations following through June 2026.
For agreements of purchase and sale signed April 1, 2026 – March 31, 2027, eligible buyers can recover up to $130,000 combined up to $80,000 of the provincial 8% portion plus an amount equivalent to the federal 5% portion — on new homes valued up to $1 million, with the full $130,000 still available up to $1.5 million and a gradual reduction down to a $24,000 floor between $1.5–$1.85 million. Per the Canada Revenue Agency’s official guidance, this applies to homes purchased as a primary residence and, under a related rebate, to new residential rental properties as well. We’re keeping this section brief on purpose this isn’t tax advice, and eligibility depends on your specific agreement dates and circumstances. Confirm your situation with a lawyer or accountant.
Will Eliminating Development Charges Make Housing More Affordable?
Development charges are a real, direct cost of creating housing on some project types, tens of thousands of dollars before construction even starts. Eliminating them lowers the cost of building, and for some projects that are currently borderline, it can be the difference between a project penciling out and not. That’s the bigger story here: not a guaranteed dollar-for-dollar drop in what a home sells for, but lower development costs and more projects becoming financially viable, which over time supports more housing supply.
Market prices are shaped by many factors interest rates, land costs, construction costs, demand so, a DC saving doesn’t mechanically translate into an equivalent price cut on every home. It’s also worth being clear about the funding mechanism: the $572M is paying for infrastructure the City needs regardless, not flowing directly to developers as cash.
“A transparent, fixed-price contract provides greater certainty around your overall project cost and how applicable fees are treated.” Charles Wah, Founder, Gateway Group

The Opportunity for Missing-Middle & Ground-Related Housing
Hamilton’s housing growth hasn’t come primarily from high-density towers much of the opportunity ahead is in ground-related, missing-middle housing: legal basement suites, secondary units, and duplex, triplex, and fourplex conversions and new builds within existing neighborhoods. That’s Gateway’s focus, and it’s also where this program’s cost changes matter most in practice the infill and multi-unit projects that were previously squeezed by development charges are exactly the projects this elimination is aimed at making viable.
I Already Have a Permit, or Already Paid, do I Get Money Back?
The commitment is designed to apply retroactively to March 30, 2026 once in force. What hasn’t been detailed publicly is the refund/credit mechanism for permits already issued or charges already paid in that window. The City also has an existing transition policy for a set period after a rate change. If this is you: contact with your permit details.
Common Questions
Is the development charge elimination in effect yet?
Not yet. Hamilton has committed to eliminating residential development charges for three years (March 30, 2026 to March 31, 2029) as a condition of a $572M provincial-federal award, but the elimination only takes effect after Hamilton City Council approves it and two intergovernmental agreements are signed. Current rules still apply until then.
How much can I save with the development charge changes?
The government estimates the full elimination could reduce the cost of building a new home by up to $100,442, though it hasn’t published how that figure was calculated. A separate HST relief, now in force, can save up to $130,000 on an eligible new home. The combined $230,000 figure describes a new-home purchase, not a renovation or second-suite project.
Does this affect a basement suite or secondary unit I’m planning?
Generally, no additional savings. Eligible secondary-suite projects up to two added dwelling units on most single-detached, semi-detached, or row house lots were already exempt from development charges before this announcement. The bigger cost drivers on those projects are permits, design, and code compliance.
What does this mean for a duplex, triplex, or fourplex project?
This is where the program has the most impact. New construction and additional units that currently attract full development charges including a fourplex’s fourth unit, which Hamilton permits but still charges DCs on are the target of this elimination. Development charges on these projects can run $30,000 or more per unit today.
I already paid development charges or have a permit does this apply to me?
The commitment is designed to apply retroactively to March 30, 2026, but the refund or credit mechanism for permits already issued or charges already paid hasn’t been detailed publicly.
When exactly do the changes take effect?
Once Hamilton City Council approves the elimination and the Build Communities Strong Fund and Transfer Payment agreements are signed. The commitment is designed to apply retroactively to March 30, 2026, once it is in force.

Find Out What This Program Means for Your Project
Planning a renovation, addition, new home, or multi-unit project? Gateway Group can help you understand how the latest changes may affect your project and guide you from planning and design through permitting and construction.
Gateway Group is a Tarion-registered design-build renovation and construction company based in the Greater Hamilton Area, specializing in legal basement suites, secondary suites, and multi-unit residential projects.




