

Transform your Markham property into a high-yield multi-family residence with expert architectural design.
We don’t just move walls; we analyze the Markham rental market to determine which layouts generate the highest monthly income. By strategically placing bedrooms and bathrooms, we help you achieve a 20-30% higher return on investment compared to standard basement finishes. Our designs prioritize long-term durability to minimize maintenance cycles.
Our team handles the entire permit process with the City of Markham, ensuring your secondary suite is 100% legal and safe. We manage all fire-separation requirements, electrical safety authority (ESA) inspections, and plumbing permits. This protects your insurance coverage and ensures a smooth sale of the property in the future.
Every multi-unit project in Markham is assigned a dedicated Site Supervisor like Bastian Zuniga or Marco Lopez to oversee daily operations. This ensures that the construction of your second suite doesn't disrupt the primary residence more than necessary. We maintain a clean, organized job site and provide weekly progress updates to keep you informed of the timeline.
We begin with a thorough inspection of your Markham property to confirm it meets the lot size and parking requirements for a multi-unit conversion. We check existing foundation integrity and ceiling heights to ensure a legal suite is viable. This phase prevents you from investing in designs that the city would eventually reject.
Our architects create detailed floor plans that maximize every inch of the available square footage while optimizing the flow between units. We handle the submission of all CAD drawings and engineering reports to the Markham Building Department. This step manages the complex paperwork required for legal status and future safety.
During construction, we install dedicated fire-separation barriers and independent ventilation systems to comply with Markham's strict fire-life safety codes. We also separate electrical panels and plumbing lines so each unit can be billed or shut off independently. This is the stage where the 'unseen' quality of our work ensures long-term property protection.
We complete the project with the high-end finishes selected during the design phase, ensuring the units are durable for tenants yet appealing to the market. We schedule and attend all final municipal and ESA inspections on your behalf. This ensures you receive your legal occupancy permit, allowing you to officially list the property for rent.
To be legal in Markham, a secondary suite must meet specific zoning bylaws, including having a minimum ceiling height, a separate entrance, and meeting fire and electrical safety standards. You must also provide at least one off-street parking space for the tenant in addition to the spaces required for the main house. Built By Pros Inc. conducts a full feasibility study of your property to ensure it can meet these City of Markham criteria before construction begins.
Costs vary significantly based on the existing condition of your home and whether you are adding an addition or finishing a basement. In Markham, a high-quality, legal basement apartment conversion typically ranges from $100,000 to $180,000, depending on finishes and utility requirements. We provide a detailed fixed-price contract after the design phase to protect you from unexpected budget overruns during the build.
The permit review process at the City of Markham can take anywhere from 8 to 14 weeks depending on the complexity of the project and the current volume of applications. Our team expedites this by submitting 'permit-ready' architectural drawings that anticipate the questions city reviewers will ask. We handle all back-and-forth communication with the building department so you don't have to navigate the bureaucracy yourself.
In many cases, yes. We utilize dust barriers and structured scheduling to ensure your living area remains separate from the construction zone. For basement conversions, we often use the new separate entrance for our team to enter and exit, minimizing traffic through your main living space. We prioritize maintaining consistent utility services, though brief planned shut-offs are usually necessary for plumbing and electrical cut-overs.
Transform your property into a high-value asset by navigating Toronto's specific legal requirements for basement apartments and garden suites. This comprehensive guide from Built by Pros Inc. breaks down the zoning, permits, and construction standards needed to build a compliant and profitable secondary dwelling.
Complete home or commercial rebuilds to give you a new structure, keeping only what can be re-purposed to save cost and the environment.
Learn MoreUpgrade existing spaces with quality craftsmanship to better meet the needs of your family.
Learn MoreWhether at your home or business, we provide zoning and permitting services as part of our planning process.
Learn MoreFull-service construction for commercial projects. Let our in house design team elevate your brand with custom space design.
Learn MoreCustom solutions to maximize the return on your property investment.
Learn MoreWe have the ADA design training in house to ensure your home is ready for your golden years , even when your are not.
Learn MoreBuilt By Pros Inc. helped us convert our large bungalow in Markham into a legal duplex. The process took about 5 months, and Suzanne was incredible at navigating the city's specific parking requirements. They used high-quality soundproofing between floors, and our tenants frequently comment on how quiet the unit is. The quartz countertops and modern kitchen they installed in the lower unit allowed us to set a record rent for the street.
We wanted to add a garden suite for my elderly parents in Markham, and Ricardo's team made the dream a reality. They managed everything from the initial excavation to the final landscaping. The project was completed within two weeks of the original estimate, which was impressive given the complexity of the utility hookups. The attention to detail in the bathroom tile work and the custom storage they built was truly top-notch.
I hired them for a multi-unit optimization of a rental property I bought near Main Street Markham. They reconfigured a messy basement into two beautiful studio suites. Despite a challenge with the existing foundation discovered during demo, they adapted the plan quickly and kept costs under control. Their knowledge of Markham's fire-code was obvious, as we passed our final inspections on the first try without any issues.

Ricardo Lora

Suzanne Morgan

Petra Tobias

Stronger Together

Bastian Zuniga

Marco Lopez
Contact us for unmatched expertise in home renovations. With experience since 2008, we deliver top-quality materials and superior workmanship—trusted by clients and built on referrals.