Basement Foundation

What This Service Involves

A basement foundation uses tall reinforced concrete walls to create a full level of usable space below grade. We excavate deep, form and pour engineered walls, and reinforce them to resist the lateral soil and water pressure that is significant in wet Western Washington ground. Comprehensive waterproofing, footing drains, and a sub-slab drainage system are essential here to keep the space dry and healthy. We coordinate the wall pours with the slab, egress openings, and utility penetrations so the finished basement is ready to develop. Done right, it is the most cost-effective square footage you can add to a home.

Benefits

A full level of below-grade space to finish later; Walls engineered for lateral soil and water pressure; Layered waterproofing built for high water tables; Footing and sub-slab drains that keep the space dry; Egress and utility penetrations planned into the pour

Our Process

1) Excavate to depth and place footings and drainage; 2) Form and reinforce tall walls, then pour to engineered specs; 3) Apply full waterproofing and install the sub-slab drainage; 4) Backfill in lifts, pour the slab, and pass inspection

What Affects the Cost

Excavation depth and the volume of soil removed; Wall height, thickness, and reinforcing required; Waterproofing system and drainage the water table demands; Egress windows and utility openings in the design; Shoring or access needs on a deep, tight excavation

Best Time of Year

Deep excavation is best in drier months when soils are more stable; we manage groundwater and protect the dig during wetter periods.