ADUs & Garden Suites in St. Catharines, Ontario

ADU Builds and Garden Suites in St. Catharines

Expert craftsmanship, local knowledge, and outstanding results — every time.

An accessory dwelling unit (ADU) is one of the most practical ways for a St. Catharines homeowner to add a second, self-contained home to an existing lot — a detached garden suite in the backyard, a converted garage, a coach house above a garage, or a legal secondary suite in the basement. Ontario's Planning Act now permits additional residential units on most residential lots, and Niagara Renovation Company designs and builds ADUs in St. Catharines from the first zoning review through to occupancy.

Every ADU project in St. Catharines in the heart of the Garden City, near the historic Welland Canal starts with the property itself. Lot size, setbacks, lot coverage, servicing, and access all shape what can be built, and properties across areas like Port Dalhousie, Merritton, Grantham vary considerably. Before you commit to anything, we review your lot against the municipality's current rules for additional residential units and tell you plainly which options are realistic — a detached garden suite, a garage conversion, or a secondary suite inside the existing house.

Our ADU service covers the full scope: design and permit drawings, building permit applications, foundations for detached suites, framing, insulation and exterior cladding, separate electrical service where required, water and sewer connections, a full kitchen and bathroom, a separate entrance, the fire separation and egress a secondary suite requires, and complete interior finishing to move-in ready condition.

Homeowners build ADUs for different reasons — rental income to help offset a mortgage, a place for aging parents or adult children to live independently nearby, or long-term flexibility and property value. If what you need is more space attached to your own living area rather than a separate unit, our home additions service is the better fit. To find out what your St. Catharines property allows, call (647) 797-9471 or fill out the form above.

ADUs & Garden Suites in St. Catharines: Local Considerations

As Niagara Region's largest city and commercial hub, St. Catharines offers a remarkably diverse housing stock — from century Victorian homes in Port Dalhousie and heritage properties in the Haig neighbourhood to modern townhomes in newer Grantham subdivisions. The Garden City's renovation market is thriving as homeowners across Merritton, Lakeshore, and Facer invest in meaningful upgrades.

Neighbourhoods We Serve in St. Catharines

Our adus & garden suites crews are active throughout St. Catharines and are familiar with local building permit requirements, preferred regional suppliers, and the specific construction characteristics common to homes in this community. Whether your home is in Port Dalhousie, Merritton or anywhere else in St. Catharines, we bring the same standard of craftsmanship and accountability to every project we take on — backed by our 5-year workmanship warranty and comprehensive insurance coverage.

Planning More Work in St. Catharines?

Many St. Catharines projects involve more than one trade. Alongside adus & garden suites, we also handle basement finishing and legal suites, home additions and full home renovations in St. Catharines, so related work can be planned and scheduled under one contract.

We also provide garden suites and ADUs in neighbouring Niagara-on-the-Lake, Thorold and Lincoln.