onestorey



* Finishes and interior layout are for illustrative purposes only















Our single-slope models combine simplicity, elegance, and functionality. By allowing you to choose the roof slope direction to ensure proper water drainage, these models adapt perfectly to all your projects—whether residential, rental, or recreational.

The structure is ingeniously designed using high-performance OSBLOCK™ blocks, enabling fast and hassle-free installation while giving you full freedom to customize both the interior and exterior to your taste. Add warmth, style, and personality to create a space that truly reflects you.

Our design stands apart from traditional construction. With OSBLOCK™ blocks, you achieve effective R-32 insulation and superior soundproofing—elevating your vision to a premium-level project.

The majestic cathedral ceiling adds grandeur and character, bringing light, volume, and prestige to your space. A bold choice that won’t go unnoticed and is sure to turn heads.

Available starting at $35,000 plus applicable taxes, this model offers an affordable yet refined solution. Expand your space in 2-foot increments for guaranteed flexibility.

The 20×20 model includes an allowance of $8,000 for the selection of doors and windows.

Indicative Pricing — “Single-Storey” Kits

This is a quick reference grid based on the most popular sizes.

With floor: Starting at $35,000
Without floor / slab: Starting at $33,100

Dimensions (ft) With Floor Without Floor
20×20 $35,000 $33,100
20×22 $36,675 $34,585
20×24 $38,350 $36,070
20×26 $40,025 $37,555
20×28 $41,700 $39,040
20×30 $43,375 $40,525
20×32 $45,050 $42,010
20×34 $46,725 $43,495
20×36 $48,400 $44,980
20×38 $50,075 $46,465
20×40 $51,750 $47,950
20×42 $53,425 $49,435
20×44 $55,100 $50,920
20×46 $56,775 $52,405
20×48 $58,450 $53,890
20×50 $60,125 $55,375
20×52 $61,800 $56,860
20×54 $63,475 $58,345
20×56 $65,150 $59,830
20×58 $66,825 $61,315
20×60 $68,500 $62,800

Note: Indicative prices only. Taxes and options not included.

Request a quote

Inclusions List – Construction Kit

This list details the components included in your prefabricated construction kit. Some modifications are available at an additional cost.

🗂️ Construction Plans

Standard complete plans compliant with permit applications
Plan modifications available at an additional cost

🧱 Floor

* Items not included with the concrete slab or garage option

* 16″ I-joist floor system
* Rim joist
* Perimeter curb wall
* 3/4″ tongue-and-groove OSB
Ready to receive the flooring of your choice

🏗️ Walls – Effective R-32 Insulation

OSBLOCK™ wall kit includes:
– Starter/finishing plates
– Exterior corner blocks
– Patented OSBLOCK™ locking system
– Locking key
– Block handling grip

For more details: https://www.osblock.ca/ressources-en-ligne/

Lintels
Exterior air barrier
1×3 exterior furring strips
Interior pre-lathed with OSBLOCK™ walls
*No vapor barrier required*
Ready for interior and exterior finishes of your choice

🏠 Roofing

16″ I-joist roof system
5/8″ tongue-and-groove OSB
Self-adhesive membrane (eaves protection)
Fascia
Starter flashing (aluminum)
25-year asphalt shingles
Half-ridge ventilated attic system
Metal roofing option available at additional cost

🧊 Ceiling – Effective R-44.5 Insulation

R-40 insulation
1/2″ rigid insulation panels R-4.5 (Enermax or equivalent)
1×3 furring strips
Ready for ceiling finish of your choice

🚪 Doors and Windows

Included allowance for doors and windows:
– 20×20 single-storey: $8,000 Garage: $6,000
– 20×20 two-storey: $12,000
– 24×24 single-storey: $10,000
– 24×24 two-storey: $15,000
– 28×28 single-storey: $10,000
– 28×28 two-storey: $15,000

❌ Exclusions

Basic hardware: screws, nails, membranes, tapes, sealants, etc.
Transportation from factory to job site
Note: Hardware is included if installation is selected.

Basic hardware:

  • Screws, nails, membranes, tapes, sealants, etc.

Plan modifications (fees apply)
Transportation from factory to project site (fees apply)

OSBLOCK Installation Manual

Comparison Chart