Toronto's architect
for homes,
additions &
businesses.
25:8 Architecture & Urban Design a design-led Toronto architecture firm. We work with homeowners, developers, and business owners navigating one of the world's most complex and exciting urban building environments.
Custom homes · Home additions · Commercial · Multi-unit · Building permits · Heritage
Architecture & urban design
services for Toronto
From bold custom homes in established neighbourhoods to mid-rise intensification projects we bring rigorous design thinking and deep GTA expertise to every brief. Toronto rewards ambition; so do we.
Residential
Custom homes, rear additions, and whole-house transformations designed around how Toronto families actually want to live with sharp knowledge of ravine setbacks, lot coverage rules, and heritage overlays.
- Custom home design
- Rear & second-storey additions
- Laneway & garden suites
- Basement apartment conversions
- Accessible & aging-in-place design
Commercial
Offices, hospitality, and mixed-use spaces that reflect Toronto's creative and entrepreneurial energy from Leslieville studios to King West flagship fit-outs to Scarborough retail redevelopments.
- Office & studio design
- Restaurant & hospitality interiors
- Retail & showroom fit-outs
- Tenant improvement drawings
- Commercial permit packages
Multi-Unit Residential
Low-rise and mid-rise multi-unit buildings shaped by Toronto's Major Streets and Avenue policies stacked towns, fourplexes, and purpose-built rentals designed for long-term value and community fit.
- Stacked townhouses
- Triplex & fourplex design
- Purpose-built rental housing
- Laneway suite developments
- Site plan approval support
Institutional
Community, civic, and faith buildings that serve Toronto's remarkably diverse neighbourhoods spaces designed with cultural sensitivity, operational clarity, and genuine civic pride.
- Community & cultural centres
- Faith & assembly buildings
- Educational facilities
- Civic & non-profit spaces
- Accessibility compliance (AODA)
The Toronto architect
who gets it done.
For homeowners in the Annex, developers intensifying along Avenues corridors, and businesses establishing themselves in the Junction here's why Toronto clients keep coming back.
Residential Intensification policies, the City's Official Plan, TLAB hearings, ravine protection overlays, and heritage designations under the Ontario Heritage Act we navigate these daily. Fewer surprises means faster approvals.
Narrow Victorian lots in Cabbagetown, ravine-adjacent sites in Leaside, tight infill in Roncesvalles, or large redevelopment parcels in Etobicoke give us a constrained site and a bold program and we'll find the design that makes it work.
Toronto's freeze-thaw cycles, OBC Part 9 and Part 3 requirements, Toronto Green Standard energy tiers, and the city's extraordinary mix of Victorian, mid-century, and contemporary fabric we design from the inside out.
Not a junior drafter. Not a project coordinator. A licensed OAA architect on every call, every site visit, every permit submission. One point of contact, full professional accountability.
Recent projects
Toronto & Ottawa projects Residential · Commercial · Multi-unit · Institutional
Full Portfolio at 258arch.com ↗Design is strategy.
Strategy is future.
Every 25:8 project follows a rigorous three-phase framework built around your Toronto site's specific opportunities, constraints, and the city's evolving planning landscape.
Discovery
We begin by listening to your vision, your site's potential, and your budget. Then we map every constraint: Toronto's Official Plan designations, zoning by-law permissions, ravine or heritage protections, and any required Committee of Adjustment or Site Plan approval. Every limitation points toward a smarter design.
Strategy
Design is strategy. We translate your goals into schematic designs and 3D studies, then chart the most efficient path through Toronto's approval process whether that means a straightforward permit application or a TLAB variance hearing with a strong evidentiary package.
Execution
From permit submission through construction administration we manage drawings, coordinate with Toronto Building, conduct field reviews, and carry the project through to occupancy. You stay informed, never blindsided.
Your Toronto architect,
wherever you're building.
From a heritage addition in Cabbagetown to a commercial fit-out in Yorkville to a laneway suite in Danforth Village 25:8 Architecture works across every neighbourhood in Toronto and the Greater Toronto Area.
Heritage permits, adaptive reuse, residential infill on tight lots, commercial interiors.
Victorian and Edwardian additions, laneway suites, small-scale commercial renovations.
Ravine setbacks, estate custom homes, heritage overlays, mid-rise intensification.
Multiplex conversions, commercial studios, custom homes, purpose-built rental.
Larger custom homes, Avenue corridor intensification, institutional and commercial projects.
New-build custom homes, mixed-use developments, institutional facilities across the region.
Not sure if we serve your area? We almost certainly do. Call us at (613) 276-8258.
Get a Free Estimate →Toronto architecture
questions, answered.
From laneway suite approvals to the Toronto Green Standard the questions Toronto homeowners and business owners ask us most.
Ask Us Anything →Architecture fees in Toronto typically range from 8–15% of construction cost for a full-service engagement covering design development, permit drawings, and construction administration. For permit-drawings-only scopes common for additions, laneway suites, and commercial fit-outs expect a fixed fee ranging from $4,000 to $15,000+ depending on size and complexity. We provide a transparent fee proposal after your free consultation.
Toronto's laneway suite guidelines require permit drawings prepared by a qualified designer or licensed architect. Given the narrow lots, rear yard setbacks, angular plane rules, and lane access requirements typical of most Toronto laneways, working with a licensed architect significantly reduces the risk of permit revisions and maximises the livable area of your suite.
Toronto Building targets 20 business days for residential permits and 30 for commercial, but projects requiring Zoning Review, Site Plan Approval, or a Committee of Adjustment hearing will take longer. The single most effective way to accelerate your permit is submitting a complete, well-coordinated application the first time which is exactly how we prepare every package.
The Toronto Green Standard sets mandatory sustainability performance requirements for new construction and major additions in the city. Tier 1 compliance is required for most projects; voluntarily meeting Tier 2, 3, or 4 unlocks development charge refunds which can be substantial on larger builds. We integrate TGS requirements from the very first design move, so compliance never becomes a late-stage scramble.
Yes. A large proportion of Toronto residential projects require a minor variance or consent hearing before the Committee of Adjustment particularly additions on undersized lots, projects that exceed height or lot coverage limits, or laneway suites with non-standard configurations. We prepare the complete application package, coordinate the planning rationale, and attend the hearing alongside you.
In Ontario, only a licensed member of the Ontario Association of Architects (OAA) may legally use the title "architect" and seal drawings in that capacity. For many residential projects, both architects and qualified building designers may submit permit drawings but a licensed architect carries professional liability insurance, is governed by a regulated code of ethics, and has the training to navigate complex structural, heritage designation, and zoning variance challenges.
Insights for Toronto
homeowners & developers
Modern Home Renovation Ideas for Toronto Homes in 2026
Toronto's housing stock from Victorian semis to postwar bungalows holds enormous potential. Here are the renovation moves that are transforming homes across the city, and how to make them work within Toronto's permit and zoning rules.
Sustainable Home Design Toronto: Custom Green Homes & What to Know
Toronto's mandatory sustainability tiers now shape nearly every new residential project in the city. Here's how to meet them and how higher Toronto Green Standard tiers can actually save you money through development charge rebates.
Toronto Architect: Modern Infill Home Trends for 2026
Infill homes are reshaping Toronto's established neighbourhoods. From the Annex to Leslieville, we break down the design and planning trends driving Toronto's most innovative new builds and what they mean for your lot.
Ready to build something
great in Toronto?
Book a free 30-minute consultation. No obligation just a clear, honest conversation about your project and what's possible.
Start your Toronto
architecture project
Ottawa, ON K1R 5K4
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Designing Tomorrow Today: 25 Hours: 8 Days a Week
642 Somerset St W,
Ottawa, ON K1R 5K4
(613) 276-8258
info@258arch.com
