Structural, Mechanical, and Specialty Drawings in Toronto and the GTA
Structural, HVAC, plumbing, and electrical drawings prepared in coordination with licensed Ontario engineers. We manage the entire process so you never chase a stamp.
The Engineering Drawings Your Permit Needs — Coordinated, Stamped, and Ready to Submit
Most residential permit applications require architectural drawings — floor plans, elevations, and site plans. But the moment your project involves structural changes, new plumbing, modified HVAC systems, or electrical modifications, the building department requires specialty drawings prepared or reviewed by a licensed professional engineer.
These are the drawings that trip up the most projects. Homeowners do not know they need them until the examiner sends the application back. Contractors know they need them but spend weeks chasing engineers for turnaround.
At GTA Permits, we coordinate the entire specialty drawing process. We work directly with licensed structural, mechanical, and electrical engineers across the GTA. We brief them, manage their scope, integrate their stamped drawings into your permit package, and resolve any discrepancies before the submission reaches the building department.
Common Projects That Require Specialty Drawings
Basement Apartments & Secondary Suites
Almost always require structural (for underpinning or separate entrance), mechanical (independent HVAC), and plumbing (independent fixtures and backwater valve) drawings.
Learn about residential building permits →Second-Storey Additions
Structural drawings are mandatory. The existing foundation and first-floor structure must be verified to support the new load. Mechanical drawings are needed if HVAC is extended to the new level.
Load-Bearing Wall Removals
Structural engineering is required for any wall removal where the wall carries roof, floor, or upper-storey loads. The structural drawings specify the replacement beam, posts, and connections.
Basement Underpinning and Lowering
Complex structural scope requiring engineered bench footing or underpinning details, shoring sequences, and foundation waterproofing specifications.
New Custom Homes
Full structural package (foundation, framing, roof), complete mechanical and plumbing designs, and electrical plans.
View our full permit drawing services →Rear and Side Additions
Structural drawings for new foundations and the connection to the existing structure. Plumbing and mechanical if the addition includes a kitchen or bathroom.
Why Coordinate Specialty Drawings Through GTA Permits
You Deal With One Team, Not Three
When you hire a structural engineer, a mechanical engineer, and an architectural draftsperson separately, you become the project manager. When you work with GTA Permits, we own the coordination. One point of contact. One submission. One invoice.
Drawings That Actually Match
The number one cause of examiner comments on specialty drawings is inconsistency between the architectural set and the engineering set. We catch these before the city does — because we review the full package as a coordinated set.
We Know What the Examiner Wants
Different municipalities have different expectations for specialty drawing detail. We prepare specialty drawings to the standard your specific building department expects — reducing revision rounds and saving weeks.
Cost-Effective Engineering Scope
We scope the engineering work precisely. If your project needs a stamped structural review but not a full structural design from scratch, that is what we brief the engineer for. You pay for what the permit requires and nothing more.
Frequently Asked Questions — Specialty Permit Drawings
Get Your Specialty Drawings Handled
Stop chasing engineers and coordinating between firms. Tell us about your project and we will confirm exactly which specialty drawings your municipality requires and deliver a complete, stamped submission package.