ADU & GARDEN SUITE BUILDER · LONDON, ONTARIO
ADU Builders in London, Ontario — from $148,000
Kuzyn Builds designs and builds accessory dwelling units across London and Southwestern Ontario. Detached models start at $148,000 with planning and building permits included and Tarion warranty coverage. Most builds run 2 to 8 months from permit approval.
Published starting prices
Most builders quote privately. These are the base prices for the pre-designed detached models, before site-specific servicing.
| Model | Size | Layout | Starting price |
|---|---|---|---|
| The Paul | 321 sq ft | Studio, 1 bath | $148,000 |
| The Maria | 409 sq ft | 1 bed, 1 bath | $168,000 |
| The Henry | 549 sq ft | 2 bed, 1 bath | $218,000 |
Including site-specific work, detached units typically land in the $148,000 - $350,000+ range. Interior and garage conversions start lower.
What the price includes
- Complete ADU structure and construction
- Interior finishes and fixtures
- Windows and doors
- HVAC system (ductless heat pump)
- Appliances (fridge, stove, dishwasher, microwave)
- Quartz countertops
- Vinyl plank flooring
- Planning and building permits
- Tarion warranty (detached units only)
Additional Costs (Not Included in Base Price): Sewer line connections and hookups; Water line connections and hookups; Electrical service connections and upgrades; Distance from main utility lines; Local permit and connection fees; Site-specific excavation and trenching; Municipal connection fees.
What to check before you hire any ADU builder
- Published pricing. Can you see a real starting price, or only "request a quote"? A builder confident in their costs will show them.
- London permit experience. ADUs and ARUs live and die by zoning, setbacks and servicing. Ask specifically about the City of London process.
- Warranty in writing. Ask whether detached units carry Tarion new-home warranty coverage, and what covers a conversion instead.
- What the base price excludes. Get the exclusions listed before you compare two numbers against each other.
- Completed local projects. Finished London-area builds you can go and see beat stock renderings every time.
Why London homeowners choose Kuzyn Builds
- Published fixed starting prices, from $148,000 — not "request a quote to find out".
- Planning and building permits included in the base price.
- Tarion warranty coverage on detached models.
- Named, pre-designed models you can compare before you commit: The Paul, The Maria, The Henry.
- Family-owned and London-based, with 80+ completed projects over 10+ years in Ontario.
- 2024 London Urban Design Awards nomination.
Frequently asked questions
How much does it cost to build an ADU in London, Ontario?
Kuzyn Builds publishes starting prices rather than quoting privately. The pre-designed detached models start at $148,000 for The Paul (321 sq ft). Interior and garage conversions start lower, from about $75,000. Utility hookups and site servicing are the biggest source of variation between lots, so a property assessment is the only way to reach an exact number.
How long does an ADU take to build in London, Ontario?
Between 2 and 8 months from permit approval to completion, depending on configuration. Interior and garage conversions are fastest at 2 to 4 months; a detached standalone unit is the longest at 4 to 8 months. Permit approval time sits ahead of that and varies with the City of London queue.
Are permits included in the price?
Yes. Planning and building permits are included in the base price of a Kuzyn Builds ADU. Ask any builder to confirm this in writing, because it is one of the most common items excluded from a headline number.
Do ADUs come with a warranty?
Detached new dwelling units in Ontario can fall under Tarion new-home warranty coverage, and Kuzyn Builds detached models carry it. Conversions and additions carry standard construction warranties instead. Confirm in writing which applies to your specific configuration before signing.
How do I choose an ADU builder in London, Ontario?
Compare on five things: whether they publish real pricing or only quote on request, their experience with City of London zoning and servicing, warranty coverage in writing, whether they build custom or from pre-designed models, and completed local projects you can actually go and look at.
Ready to Talk Through Your ADU?
No sales pitch — a straight conversation about your lot, your budget and whether an ADU makes sense.