Proper attic ventilation is one of the most overlooked aspects of Surrey, BC roofing. Inadequate ventilation shortens shingle life, causes winter condensation, and voids manufacturer warranties. This guide covers what attic ventilation work costs in Surrey in 2026 and how to tell if your system is adequate.
Attic ventilation assessment: I-M Roofing Ltd. — 236-838-9577
Attic Ventilation Cost Surrey BC — 2026
| Service | Cost Range |
|---|---|
| Ridge vent installation (per 10 ft) | $400 – $900 |
| Soffit vent addition/repair (per location) | $100 – $250 |
| Box vent replacement | $150 – $350 each |
| Power attic fan | $500 – $1,200 |
| Insulation baffles (per rafter bay) | $20 – $50 |
| Full system upgrade (ridge + soffit + baffles) | $800 – $2,500 |
BC Building Code Requirement
BC Building Code requires 1 sq ft of free ventilation area per 300 sq ft of attic floor (1:300 ratio) when split equally between soffit intake and ridge/high exhaust. For a 1,600 sq ft attic: minimum 5.3 sq ft of net free area needed.
Signs of Inadequate Ventilation
- Ice damming at eaves in winter
- Moisture staining on attic rafters
- South-facing shingles failing faster than north-facing
- High summer cooling costs
Related
Book ventilation assessment: 236-838-9577
