A City of Ottawa addition permit takes 4 to 12 weeks depending on scope. Start the conversation now for a spring start.
Footings below frost depth Four-season options available Free written quotes

Sunroom additions built for an Ottawa winter, not just an Ottawa summer

A sunroom addition in Ottawa typically costs $25,000-$45,000 for a three-season room or $45,000-$70,000 for a four-season room. The permit takes 4 to 12 weeks to issue, and a four-season room gets footings below frost depth, not a floating slab.
Foundation founded to clear local frost depth, not a floating slab
Glazing and insulation specified for a four-season option
Rear-yard setback confirmed before design
Written quote itemised by scope

Get a quote for this addition

Tell us the space you have and what you're hoping to add.

What can we help with?

So the right crew reviews your project.

Every quote is site specific.

Three-season or four-season: the decision that sets the budget

The single biggest choice in a sunroom project.

Three-season sunroom

Lighter glazing and no dedicated heating, sized for spring through fall use. The lower end of the price range.

Four-season sunroom

Insulated glazing, a proper foundation, and heating sized to keep the room usable through an Ottawa winter. The higher end of the range.

The foundation decides which is realistic

A four-season room needs a foundation founded below frost depth like any other addition. A lighter three-season structure has more flexibility, but we still design its footing properly.

Sunroom interior with a wall of tall windows being trimmed by a carpenter

Why a floating slab is the wrong foundation for a four-season room

Footings in this region are commonly founded to about 1.5 m to get below frost depth, and a four-season sunroom with real glazing and heating needs that same protection, or frost heave will crack the floor and rack the window frames within a few winters. A three-season sunroom has more foundation flexibility since it isn’t loaded with heavy glazing or heated through the coldest months, but we still design its footing to suit the structure rather than picking a footing on price alone.

Sunroom addition prices in Ottawa

Three-season and four-season rooms, priced separately.

Three-season sunroom

$25,000-$45,000

Lighter glazing, no dedicated heating
Sized for spring through fall use
Foundation designed to suit the lighter structure
Priced as a full project

Price a three-season sunroom
Most popular

Four-season sunroom

$45,000-$70,000

Insulated glazing and dedicated heating
Foundation founded below local frost depth
Usable year-round, including an Ottawa winter
Itemised quote after a site visit

Price a four-season sunroom
Covered side patio of a brick home being enclosed with new stud walls and window openings in Carp, Ottawa
Porch enclosure

Recent Project in Carp

In Carp we enclosed the covered patio along the side of a brick home to turn it into year-round living space. New stud walls went up on the existing concrete slab, tied into the brick exterior and the existing roof overhang, with rough openings framed for new windows.

See more about our Carp work
Our Process

How we run a sunroom addition project

1

Choose the season target

We talk through three-season versus four-season use before designing the foundation and glazing.

2

Confirm setback and footprint

The addition's footprint is checked against your rear-yard setback before finalizing the design.

3

Foundation and structure

Footings built to suit the chosen season target, then the frame and glazing installed.

4

Heating and finish

Heating installed for a four-season room, then final finishing and a walk-through.

What Ottawa homeowners say

Reviews given to us directly by clients.

5/5

Home Additions Experts Ottawa built a beautiful family-room addition for our home. The team communicated clearly, stayed organized, and made sure the new space blended perfectly with the original house.

Jonathan M.

Direct Client

5/5

We hired them to add an extra bedroom and bathroom to our Ottawa home. The workmanship was excellent, and the team kept us informed throughout the entire project. We are very pleased with the finished space.

Nicole R.

Direct Client

5/5

The team managed our home addition professionally from the initial planning stage through construction. They answered our questions, respected our property, and delivered a result that exceeded our expectations.

Andrew T.

Direct Client

Three-season or four-season: what to confirm before you sign

What the foundation is designed for

A four-season room needs a foundation founded below local frost depth. Ask what your specific design calls for and why.

The glazing specification

Insulated glazing is what makes a four-season room usable through winter. Ask what glass or panel system is quoted, not just 'sunroom windows.'

Whether heating is included

A three-season room typically has none. If you want year-round use, confirm heating capacity is scoped and priced, not assumed.

How the addition fits your rear-yard setback

Ask to see your lot's measurement against the rear yard setback for your zone before committing to a footprint.

4 to 12 weeks Typical time to get a City of Ottawa permit
Free Site visit and zoning check before any price
150-250 sq ft Typical sunroom size
1.5 m Common local footing depth for a four-season foundation

Sunroom Addition questions

Can I use a sunroom year-round in Ottawa?

Only if it's built as a four-season room, with insulated glazing, a properly founded foundation below frost depth, and dedicated heating. A three-season sunroom is not designed for the coldest months.

How big is a typical sunroom addition?

Our ranges cover a typical 150-250 sq ft sunroom. Larger rooms are quoted individually.

Does a sunroom need the same foundation as a full addition?

A four-season sunroom does, founded below local frost depth like any other addition. A three-season sunroom has more flexibility, but we still design the footing to suit the structure rather than skip it.

Does a sunroom addition need a building permit?

Yes, any addition that adds floor area needs a City of Ottawa building permit, and we confirm your rear-yard setback allows the footprint before submitting.

Price your sunroom addition

We measure the space, check the zoning and give you a written quote.

Request a free consultation Call (343) 459-6310
Back to top