Legal basement apartments & secondary dwelling units
Complete lower-level conversions planned around your home, intended use and the approvals required for the project.
Explore basement conversions
Ottawa basement construction specialists
Turn your basement into valuable, livable space.
From feasibility and drawings to entrances, egress windows and complete construction, Opvion coordinates the details that make basement projects work.
Basement apartments & SDUs
Separate entrances & egress
Permit coordination available
Basement-first expertiseFocused scopes for lower-level construction
Clear written scopeInclusions, exclusions and pricing documented
Permit-aware planningRequirements reviewed before work begins
Ottawa service areaOttawa and surrounding communities
What we build
One coordinated team for the whole basement.
A basement project is more than finishes. We help connect the layout, structural openings, life-safety details, trades and inspections into one practical construction plan.
Separate entrances & egress windows
Foundation openings, excavation, drainage, waterproofing, stairs, doors and window-well work coordinated as one scope.
Explore entrance and egress workBasement finishing
Comfortable family space, guest suites, offices and recreation rooms with durable, practical finishes.
View finishing servicesPermits & drawings
Site-specific drawing and permit coordination available where included in the project scope.
Understand the planning stageSelective renovation work
Bathrooms, kitchens, framing, drywall and related construction that supports a complete basement project.
Discuss your scopeEarly feasibility
Four questions to answer before pricing the build.
Every house is different. A useful first consultation identifies the site conditions that can change the design, approvals, budget and schedule.
How will people enter and exit?
Existing access, a new entrance and bedroom egress all affect the plan.
What are the clear heights?
Measure under ceilings, beams and ducts before committing to a layout.
Where can services connect?
Plumbing, electrical and HVAC locations can reshape the best design.
What approvals are required?
Drawings, permits and inspections depend on the proposed work and property.
Final requirements are determined by the applicable authorities and project-specific professionals. This website provides general planning information only.
A controlled construction process
Know what happens before walls get closed.
Good basement work depends on decisions made early: drawings, site conditions, approved scope, trade coordination and inspection timing. Opvion organizes the project around those checkpoints.
- Written scope, assumptions and exclusions
- Selections and long-lead items tracked before construction
- Changes priced and approved in writing
- Progress communication and documented closeout
1
Fit & feasibility
Goals, photos, rough dimensions, timing and site constraints.
2
Site review & scope
Verify conditions and define what is included before final pricing.
3
Drawings & approvals
Coordinate project-specific documents and permits where included.
4
Construction & inspections
Sequence work, trades, quality checks and required inspections.
5
Walkthrough & closeout
Review completion items and organize the project record.
Common questions
Start with the right conversation.
Can you tell me whether my basement can become a secondary unit?
We can start with a practical feasibility review. Final confirmation depends on the property, proposed design, applicable zoning and building requirements, and any required professional review.
Do you handle drawings and permits?
Drawing and permit coordination can be included in the written project scope. We define who is responsible for each submission, fee and inspection before work starts.
Can you build only a separate entrance or egress window?
Yes. Standalone entrance and egress scopes can be reviewed, subject to the existing structure, grading, drainage, utilities, access and permit requirements.
What should I send before the first call?
Send the property address, a short description of your goal, photos of the basement and exterior, approximate ceiling height, desired start window, and any drawings or inspection notes you already have.
Your next step
Send the basics. Get a useful first conversation.
Tell us the address, intended use, timing and what drawings or photos you already have. We’ll review the fit and recommend the next step.