Can I add a secondary suite to my home?

Yes, in many cities / municipalities, you can add a secondary unit—also known as an in-law suite, basement apartment, or accessory dwelling unit (ADU)—but it must meet specific zoning and building code requirements. At R. Viau Drafting & Design, we help homeowners navigate the process with professionally prepared SDU reports.

What is an SDU inspection?

A SDU feasibility inspection is an early-stage evaluation that helps a homeowner (or possible buyers) determine whether their property is suitable for building a Secondary Dwelling Unit (SDU) - like a basement suite, garden suite, or laneway home.

Our SDU inspections give clear insights into zoning, code compliance and fire safety - so you can make confident informed decisions and avoid costly surprised down the road.

Circumstances where SDU inspections are beneficial:

Pre-purchase Inspections

Getting an SDU inspection before buying a home is a smart move if you're planning to add a rental unit or multi-generational space.

You don’t want to buy a house thinking you can add a suite, only to find out after closing that it’s not allowed—or would cost $50k more than you expected. This inspection helps avoid that mistake.

Before Committing to Permit Plans

SDU inspections are a great tool to use as they highlight the upgrades that are needed to meet building and zoning codes - before spending money on plans or permits.

When Legalizing an Existing Unpermitted Suite

Many homeowners inherit or buy properties with unpermitted basement or garage suites. If they want to bring them up to code (to rent legally, refinance, or sell), an SDU inspection outlines what’s missing and what needs to be fixed.

As a Real Estate Investor or Developer

If your goal is to rent out the unit, sell for profit, or create cash flow, an SDU inspection gives you clarity on whether the units are fully legal.

The benefits of our secondary unit inspection

Our SDU inspections, reports and cost analysis will provide you with a complete overview of all deficiencies present in the home.

Our detailed reports empowers you to make informed decisions, avoid costly surprises and move forward with confidence - whether you're buying a home or looking to renovate your existing home.