When most homeowners think about a construction project, they picture walls going up, materials being delivered, and crews hard at work shaping something new. What often gets overlooked is everything that happens before any of that begins. Excavation and site preparation are foundational steps — quite literally — and skipping or rushing them is one of the most common causes of costly problems down the road.
At Kory's General Contracting, we've seen firsthand how proper site prep sets the tone for the entire project. Whether we're breaking ground for a new home, adding a room addition, putting in a retaining wall, or preparing land for a detached garage, the work that happens in those early stages determines how well everything above it will perform for decades to come.
So what exactly does excavation and site preparation involve? Let's walk through the key steps so you know what to expect.
The first thing we do before any digging begins is assess the site. This means reviewing the property layout, checking for underground utilities, and understanding the soil conditions. In the Vancouver, WA and Portland, OR area, soil can vary quite a bit from one neighborhood to the next. Some areas have excellent natural drainage and stable soil composition. Others may have clay-heavy soil that retains water, or ground that requires compaction before it can support a structure. Knowing what you're working with upfront prevents surprises later.
Utility locating is a critical part of this early phase. Before any equipment breaks ground, we contact the appropriate services to have underground lines marked — gas, water, electrical, sewer, and telecommunications. This isn't just a best practice; it's a legal requirement and a serious safety measure. Hitting an unmarked utility line can cause dangerous situations and project delays that nobody wants.
Once the site is assessed and utilities are marked, clearing and grubbing begins. This is the process of removing vegetation, roots, debris, and any other organic material from the work area. Tree stumps, brush, and surface vegetation need to be removed because organic material breaks down over time, creating voids and settlement issues beneath your structure. A clean, cleared site is a stable starting point.
Next comes the actual excavation. Depending on the scope of your project, this could mean digging out a basement, trenching for a foundation, grading a slope, or cutting into a hillside. Our equipment operators work carefully and precisely, following engineered plans to ensure that depth and dimensions are accurate. Even a few inches off in the wrong direction can affect how well your foundation sits and drains.
Grading is one of the most important aspects of site preparation and one that homeowners often underestimate. Proper grading ensures that water flows away from your structure rather than pooling around it or pushing against foundation walls. Here in the Pacific Northwest, where we see significant rainfall throughout much of the year, drainage planning is especially important. Poor grading is a leading cause of basement moisture issues and foundation damage, both of which are expensive to fix after the fact.
After grading, the subgrade — the layer of soil directly beneath your structure — is compacted. Compaction removes air pockets and increases the load-bearing capacity of the soil. This is typically done with mechanical compactors, and in some cases, additional fill material may be brought in to achieve the right density and elevation. Compaction testing is sometimes performed to confirm the ground meets engineering specifications before any concrete is poured.
Depending on the project, drainage systems such as French drains, catch basins, or perforated pipe may also be installed during this phase. Getting these systems in the ground before the build begins is far easier and less expensive than trying to retrofit them later.
One question we hear often is how long site preparation takes. The honest answer is that it depends on the size of the project, the condition of the land, and the weather. A straightforward residential project might take a few days. A more complex job involving significant grading, rock removal, or poor soil conditions could take longer. We always communicate realistic timelines with our clients so there are no surprises.
It's also worth noting that excavation work requires permits in most cases. As a licensed, bonded, and insured contractor, Kory's General Contracting handles the permitting process so you don't have to navigate that on your own. We make sure all the right paperwork is in place before equipment ever arrives on site.
If you have a project coming up that requires excavation or site preparation in the Vancouver, WA or Portland, OR area, we'd love to talk through what the process looks like for your specific situation. Getting the ground right is how we build things that last, and that commitment to doing the job properly from the start is something we take seriously on every project we take on.