How to Compare Yard Drainage Estimates

Compare yard drainage estimates by the work each proposal actually covers. The lowest total may leave out restoration, use a different collection method, or stop short of addressing another water source. A higher total also needs an explanation. Price alone cannot tell you whether either plan fits your yard.

For a Charlotte homeowner, the most useful comparison starts with one question: can each contractor explain how water enters the system, travels through it, and leaves the property’s problem area?

1. Give every contractor the same problem to solve

Show each contractor the same wet areas, downspouts, existing drains, and discharge points. Share photos taken safely during rain, along with what you observed afterward. Water moving across the lawn during a storm tells a different story from ground that remains soft after the surface clears.

Explain your priority. You might need to stop runoff crossing a patio, address saturated soil beside a walkway, or move roof water away from the house. If you discuss only the backyard with one contractor and the entire property with another, their totals will not be directly comparable.

Ask each proposal to identify which problems it addresses. Our article on how we diagnose a yard drainage problem explains the observations behind a useful plan.

2. Compare the collection method and materials

The phrase “install drainage” leaves too much open. A drainage design should make the collection and discharge route clear. A written scope should describe the type and location of collection, the pipe being installed, and the intended route.

For groundwater collection, ask about the assembly around the perforated pipe. Our burrito-wrap method uses clean washed angular stone enclosed in suitable non-woven drainage geotextile. The materials work together to collect water while separating surrounding soil from the drainage stone.

For roof runoff, ask how solid conveyance pipe connects to the downspout and reaches its outlet. A perforated groundwater collector should not be treated as an interchangeable roof-water extension.

For surface runoff, ask where the inlet sits and how the surrounding grade brings water to it. A basin in the wrong location can leave the puddle beside it.

Our guide to French drains and catch basins can help you understand those differences before reviewing the proposals.

3. Make every proposal explain the discharge

Find the outlet on each plan. Ask how its elevation relates to the collection area and where discharged water goes next. A quote that names a drain but leaves its destination unclear needs more detail.

If the contractor plans to use an existing line, ask what is known about its condition and capacity. If the proposal depends on a connection outside the immediate work area, ask what needs to be verified before construction.

Different outlet choices may explain a large difference in scope. One proposal might use a gravity route around the house. Another might include pumping because the collection point is too low for the route it proposes. Have the contractor explain the tradeoffs, including access, power dependence, maintenance, and the downstream receiving area.

4. Put restoration and exclusions beside the total

Read the parts of the estimate that describe what happens after the pipe is installed. Compare removal of excess soil, finish grading, seed or sod, disturbed beds, and any walkway or driveway work.

Also check who handles known private irrigation lines, landscape lighting, or other features in the route. Ask what assumptions the price makes about existing conditions. Buried damage or an unexpected obstruction may require a change, but the process should be clear before digging starts.

Use this short comparison list:

• Problems and areas included
• Collection components and pipe materials
• Route, outlet, and receiving area
• Surface restoration and cleanup
• Exclusions and change-approval process
• Payment terms, stated warranty, and maintenance responsibilities

Do not assume an item is included because it appeared in a conversation. Ask for it in the written scope.

5. Choose the explanation you can follow

A useful contractor can tell you why the proposed work fits the site and where uncertainty remains. Ask what will be inspected or tested, what those checks can show, and what the system is intended to handle. A hose test can demonstrate a flow path; it does not prove performance in every future storm.

If two proposals differ, send the same focused question to both contractors. You need the reason for the difference before deciding whether the added work is worthwhile.

For more help reviewing proposals, watch Nick’s video on comparing drainage quotes. He covers comparing the same scope of work and making sense of different quote formats.

Need an exterior drainage assessment in the Charlotte area? Contact Drain My Lawn at www.drainmylawn.com or 704-489-3444. Bring your observations and ask for a plan you can understand.