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Triangle
Design & Development Ltd
Architectural design, structural engineering, building permits, inspections, and construction
all handled by a single accountable team.
5+
Disciplines in-house
7
Step process
GTA
Wide coverage
24h
Quote turnaround
About Us
About Us
One firm. Every phase.
One firm. Every phase.
Triangle Design & Development Ltd. is a Toronto-based full-service consultancy bringing together architectural design, structural engineering, building permits, professional inspections, and construction management under one roof.
We work with homeowners, builders, investors, and developers across the Greater Toronto Area — guiding every project from the first sketch through to the occupancy certificate with a single, accountable team.
Whether you're building a custom home, converting a duplex, adding a laneway suite, or tackling a commercial renovation — we handle the complexity so you can focus on the vision.
Registered E&O Insured OBC Specialists Licensed Professionals
Our Services
Our Services
What we do
What we do
Five integrated disciplines — one seamless process from design through construction.
01 — Architectural
Architectural design
Architectural design
Permit-ready drawings combining your vision with code compliance and construction efficiency.
Custom HomesLaneway HousesAdditions
02 — Structural
Structural engineering
Structural engineering
Foundation design, beam design, underpinning, and load-bearing wall removal — stamped by qualified engineers.
BeamsUnderpinningWall Removal
03 — Permits
Building permit services
Building permit services
We prepare, submit, and manage your full permit application — handling all city communications on your behalf.
TorontoGTAOBC
04 — Inspections
Engineering inspection reports
Engineering inspection reports
Foundation, framing, grading, insurance, and assessment reports for homeowners, contractors, and municipalities.
FoundationInsuranceGrading
05 — Construction
Construction & project management
Construction & project management
Complete construction delivery with coordinated trades, schedule control, and quality workmanship.
New HomesDuplexRenovations
06 — Other
Reports
Reports
Why choose us
The Triangle advantage
The Triangle advantage
What makes us different from hiring separate architects, engineers, and contractors.
One team, total accountability
One team, total accountability
Design, engineering, permits, and construction under one roof. No gaps between consultants, no one to blame but us — and we deliver.
Cost-smart engineering
Cost-smart engineering
Every structural and architectural solution is optimized to reduce unnecessary construction costs without compromising safety or quality.
Free quote within 24 hours
Free quote within 24 hours
No-obligation consultation and written quote delivered within one business day. You'll know exactly what to expect before committing.
First-pass permit approvals
First-pass permit approvals
Our permit packages are complete and accurate from day one. We know what Toronto Building examiners look for — and we deliver it.
Designed around your project
Designed around your project
Your property, goals, and budget drive every design decision. We never start with a template — we start with your brief.
Licensed and insured
Licensed and insured
Licensed Professionals with full Errors and Omissions insurance coverage — giving you professional protection on every project.
Our process
From first call to occupancy certificate
From first call to occupancy certificate
Seven steps, one team, total transparency at every stage.
- Free consultation
Tell us your goals, timeline, and budget. We'll outline a clear path — at no cost.
- Site visit and assessment
We visit your property, measure, and identify any zoning or structural considerations.
- Design development
Architectural and structural drawings tailored to your project and Ontario Building Code.
- Permit application
We submit and manage all city communications through to permit approval.
- Construction
Professional execution — on schedule, within budget, with clear communication.
- Inspections
We coordinate City inspections and prepare all required engineering reports.
- Final completion
Occupancy certificate, close-out documents, and a project delivered to your satisfaction.
Project types
We work on projects like yours
We work on projects like yours
From single-family additions to full multiplex conversions — residential and commercial across the GTA.
Custom home construction
Custom home construction
Legal basement apartments
Legal basement apartments
Duplex, triplex & fourplex
Duplex, triplex & fourplex
Laneway & Garden Suite
Home additions & alterations
Home additions & alterations
Commercial renovations
Commercial renovations
Client testimonials
What our clients say
What our clients say
Real feedback from homeowners, investors, and contractors across the GTA
"Triangle DDL handled our basement conversion from drawings to permit to construction. One team, no headaches. Our permit was approved on the first submission."
SK
S. Kumar
Legal Basement — North York
"We converted our house into a triplex and Triangle managed the entire process. The structural drawings were detailed, the permit came through quickly, and the build was on budget."
MR
M. Rahman
Triplex Conversion — Scarborough
"As a general contractor, I've used Triangle DDL on multiple projects. Their engineering drawings are thorough, their permit submissions go through clean, and they're always reachable."
DP
D. Petrov
General Contractor — Toronto GTA
FAQ
Common questions
Common questions
Answers to what most clients ask before they call us.
Do I need a permit for a basement apartment or renovation?
Yes — in most cases. Any new basement apartment, addition, structural modification, or change of use requires a building permit in Toronto and across the GTA. We'll tell you exactly what's required in your free consultation.
How long does a Toronto building permit take to approve?
Typical residential permits take 4–10 weeks depending on project complexity and current City backlog. Our permit packages are prepared to minimize revision requests, which is the most common cause of delays.
Can you handle both the design and the construction?
Yes — that's our core strength. We are one of the few firms in Toronto that provides architectural design, structural engineering, permit management, and construction under the same team. This eliminates gaps and keeps your project moving.
What areas of Toronto and the GTA do you serve?
We serve Toronto, North York, Scarborough, Etobicoke, East York, Mississauga, Brampton, Vaughan, Markham, Richmond Hill, and surrounding GTA municipalities.
How much does a building permit drawing package cost?
Pricing varies by project scope. We provide a detailed, no-obligation quote within 24 hours of your consultation — so you'll know exactly what to expect before we start.
Are you licensed and insured?
Yes. Triangle DDL is a BCIN-registered firm with full Errors and Omissions (E&O) liability insurance. Our drawings are prepared by qualified professionals and comply with the Ontario Building Code.
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