SERVING THOROLD · LEGAL BASEMENTS & HOME ADDITIONS

Legal Basements & Home Additions
in Thorold — Built With Clarity.

Fixed price. Permits handled. No surprises. From basement suites to home additions — permitted, built, and ready to use in Thorold.

BOOK YOUR FREE ASSESSMENT

Free assessment · No obligation · Thorold & surrounding area

THE PROBLEM

An unfinished basement in Thorold — or a house you've outgrown — is wasted potential.

Most Thorold homeowners delay because the process seems complicated — permits, zoning, contractors who disappear after the deposit. But every month you wait is rental income or living space you're not getting.

The process is only complicated when nobody manages it properly. We manage everything — for both basements and additions.

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Permit Confusion

Most homeowners don't know what permits are required, what drawings are needed, or how to submit to the City of Thorold Building Division.

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Zoning & Code Gaps

Egress, fire separation, ceiling height, gross floor area limits — Thorold's Comprehensive Zoning By-law No. 60-2019 sets specific rules for second dwelling units.

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Unpermitted Work Risk

Work done without permits creates liability at resale and can force expensive corrections when buyers or inspectors find it.

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Lost Time, Lost Money

Every month of delay is rental income you're not collecting, or space your family still doesn't have.

WHY PARAHOMES IN THOROLD

We handle everything — from the Building Division to final inspection.

Thorold regulates basement apartments as "second dwelling units" under Comprehensive Zoning By-law No. 60-2019, which took legal effect May 23, 2024 following Ontario Land Tribunal Order OLT-22-002825. A second dwelling unit is permitted per lot, subject to a Building Permit, and capped at 40% of your principal dwelling's gross floor area. We confirm eligibility and manage the full submission with the City's Building Division on your behalf.

Every project — basement or addition — is fixed price, fully permitted, and delivered on the timeline agreed at scope sign-off.

✓Zoning verification handled before you commit to anything
✓Full permit application and Building Division submission handled
✓Egress, fire separation, and code compliance included
✓100% first-submission permit approval rate
✓2-year workmanship warranty — backed in writing

Before — unfinished basement, PARAHOMES legal basement project in Thorold

After — finished legal basement suite, PARAHOMES legal basement project in Thorold

100%

Permit approval, first submission

10 Yrs

PARAHOMES hands-on renovation experience

$1,500–$1,900

Typical monthly rent, Thorold basement suite

2 Years

Workmanship warranty, in writing

THOROLD PERMIT PROCESS

Exactly how we get your legal basement suite or home addition approved in Thorold.

The City of Thorold Building Division reviews every application against the Ontario Building Code and Comprehensive Zoning By-law No. 60-2019, which permits one second dwelling unit per lot at up to 40% of the principal dwelling's gross floor area, plus one additional parking space (tandem permitted). The office is based at 8 Carleton St. S., 2nd Floor, and can be reached at 905-227-6613 ext. 277 — but you won't need to call them. We do.

Thorold does not currently offer a dedicated online portal for residential permit applications — submissions go in person at the Planning & Building Services counter or by mail to the Building Division. Once a complete application is received, plans examination follows the province's statutory house-class review target of 10 business days under O. Reg. 332/12.

✓Step 1 — Zoning verification. We confirm your lot's zoning permits a second dwelling unit and check your project against the 40% gross floor area cap under By-law 60-2019 before you commit to anything.
✓Step 2 — Permit drawings & submission. We prepare drawings meeting Ontario Building Code fire separation, egress, and ceiling height requirements and submit a complete application to the Building Division at 8 Carleton St. S.
✓Step 3 — Revisions & City requests. Any requests for revisions or additional information from the Building Division are handled by us — not you.
✓Step 4 — Inspections, start to finish. We book and attend every required inspection through construction, including confirming your required parking space on-site.
✓Step 5 — Final sign-off. Your space is officially legal and ready to use, with all permits and inspections closed out.

CHECK YOUR PROPERTY'S ELIGIBILITY IN THOROLD

HOW IT WORKS IN THOROLD

Three steps from assessment to finished space.

Every project — basement legalization or home addition — follows the same structured process. No surprises. No confusion.

STEP ONE

Assess

We inspect your property, review Thorold zoning and permit requirements under By-law 60-2019, and give you a realistic cost range and timeline. No commitment required.

You leave knowing exactly what your project involves.

STEP TWO

Plan

We lock the full scope in writing, prepare permit drawings, and submit to the City. Fixed price agreed before any work begins.

Permits submitted. Price locked. Nothing starts until you've approved every detail.

STEP THREE

Build

We complete all construction, manage every inspection, and deliver a finished, city-certified space — on time and on budget.

A legal, inspected result. Ready to use.

"Everything was clearly defined from day one. No surprises, no scope changes."

START YOUR THOROLD PROJECT

PROVEN RESULTS ACROSS THE REGION

Clients who renovated without the chaos.

Real PARAHOMES basement conversions from across the Niagara Region.

Everything was clearly defined from day one. No surprises, no scope changes.

✓ 3-bedroom legal suite · 7 weeks · Now renting at $1,600/month

Jennifer R.

Homeowner · St. Catharines

My basement went from unused space to $1,600 a month in rent. My friends came over, saw it, and wouldn't stop asking who did it. Now they're calling PARAHOMES too.

✓ Basement legalized · $1,600/mo rental · Completed May 2023

Tiffany C.

Homeowner · Niagara Falls

VIEW ALL SUCCESS STORIES →

COMMON QUESTIONS

Thorold Questions

Everything you need to know before your free assessment.

Most single detached, semi-detached, and townhouse lots in Thorold qualify for a second dwelling unit under Comprehensive Zoning By-law No. 60-2019, subject to the 40% gross floor area cap and parking requirements. We confirm eligibility for your specific property at your free assessment.

We do — start to finish. We prepare and submit your complete application directly to the Thorold Building Division at 8 Carleton St. S. and manage every inspection, so you don't deal with the City at all.

Thorold doesn't publish a city-specific turnaround time for second dwelling unit permits — plans examination follows the province's statutory target of 10 business days for house-class permits under O. Reg. 332/12 once a complete application is submitted. We'll give you a specific project timeline at your free assessment.

Yes — Home Additions follow the same fixed-price, permits-handled process. We'll walk through both options at your free assessment if you're not sure which fits your property.

Know what your project will cost — before construction begins.

Book a Free Assessment. Leave with a clear scope, a realistic budget, and a timeline — not a vague quote.