What is the best way to soundproof a basement suite in Vancouver?

Effective basement suite soundproofing requires addressing both airborne noise (voices, TV) and impact noise (footsteps) through a combination of mass, decoupling, and absorption techniques. The key is creating separate assemblies that don't directly connect to the structure above.

For ceiling soundproofing, the most effective approach is building a resilient channel system or staggered stud ceiling that's decoupled from the floor joists above. Install resilient channels perpendicular to the joists, then attach 5/8" Type X drywall. Fill the cavity with rockwool or fiberglass insulation (R-12 minimum). This assembly can achieve STC ratings of 50-55, which significantly reduces both conversation and footstep noise. Avoid recessed lighting in soundproof ceilings as they create weak points.

Wall soundproofing depends on whether you're dealing with party walls or exterior walls. For interior walls, consider a double-stud wall system with rockwool insulation and two layers of 5/8" drywall on each side. This creates excellent sound isolation but reduces room size. A more space-efficient option is using sound-dampening compound (like Green Glue) between two drywall layers on resilient channels.

Floor soundproofing is equally important but often overlooked. Install a floating floor system using acoustic underlayment beneath laminate, engineered hardwood, or luxury vinyl plank. Carpet with quality underpad provides excellent sound absorption. Avoid hard surfaces like ceramic tile directly on concrete as they amplify footstep noise.

This also includes the city's secondary suite registration requirements, which mandate proper sound separation between units. The BC Building Code requires a minimum STC rating of 50 between dwelling units, and IIC (Impact Insulation Class) rating of 50 for floor/ceiling assemblies. Many older Vancouver Specials and character homes weren't built with these standards, so retrofitting is essential for legal suite registration.

Professional vs DIY considerations: While homeowners can install some acoustic materials, achieving proper STC ratings often requires professional installation, especially for resilient channel systems and fire-rated assemblies. Improper installation can actually worsen sound transmission by creating flanking paths.

Budget expectations for comprehensive basement soundproofing range from $8-15 per square foot for DIY materials, or $15-25 per square foot professionally installed. A typical 600 sq ft suite might cost $5,000-$12,000 for proper soundproofing.

A good starting point is reaching out to contractors who specialize in this type of work in your area.