Foundation drainage systems cost in Houston

A foundation drainage system in Houston usually costs about $1,650 to $12,250, the typical range a 2026 national French drain guide reports, with an average near $5,000. Exterior drains run about $10 to $65 per linear foot. Interior drains cost more, about $40 to $100 per foot, and are rare here because Houston has almost no basements. Length is the biggest driver, then depth, the outlet, and any concrete or landscaping in the way. For how these systems work on local clay, start with foundation drainage in Houston. Below: prices by length, what moves a quote, and which system suits a Houston home.

How much does a foundation drainage system cost in Houston?

Most residential foundation drainage systems cost between $1,650 and $12,250 installed, based on a 2026 national guide. A short exterior French drain along one wet side can come in near the low end, while a drain wrapped around the whole house with a dry well or storm sewer tie-in sits higher. We haven't found published Houston-only figures, so these national numbers are a guide, not a quote.

A local contractor gives the real price in writing after seeing the lot, the fall to an outlet and what has to be dug up.

What is the average cost of putting in a French drain?

The average French drain costs about $5,000 installed, according to the 2026 LawnStarter guide, with the extremes running from around $500 for a very short run to $18,000 for a large job. Labor and equipment make up most of the bill. The pipe itself is cheap, about $0.50 to $3 per foot, so trench length and digging conditions set the total.

Length is the easiest way to estimate. The same guide puts these totals on runs of pipe:

Draining only the one or two wet sides keeps many Houston jobs in the 50 to 100 foot band. Doing it yourself costs far less in cash, around $700 in the guide, but you need a steady fall and a real outlet. The steps are on how to install foundation drainage.

Do exterior or interior foundation drainage systems cost more?

Interior systems cost more, roughly $40 to $100 per foot against $10 to $65 for exterior work, because the crew has to break and replace concrete and usually add a sump pump. In Houston, almost every house drainage job is exterior. Interior perimeter drains are a basement product, and slab-on-grade homes here rarely need one.

Exterior work comes in two kinds: a shallow yard drain that catches surface water, and a deeper footing drain beside the foundation edge, which costs more to dig. The difference between the two is explained in foundation drain vs French drain.

On older pier-and-beam houses, such as many in the Houston Heights, the goal is a dry crawl space. That usually means an exterior drain or regrading, not work inside. If the floor framing has already been damaged by damp, see pier and beam foundation repair.

What makes a foundation drainage quote higher or lower?

Five things move the price most: total length, depth of the trench, how far the water has to travel to an outlet, what sits on top of the route, and the soil. A drain that empties to a nearby low point is cheapest. One that needs a dry well, a storm sewer connection or a pump costs more, and concrete or mature beds along the route add hand work.

• Length and depth. Every extra foot of trench adds labor. A footing drain dug down beside the slab costs more per foot than a shallow yard drain.
• The outlet. Houston lots are flat. Getting enough fall can mean a longer run, a dry well at $500 to $3,000, or a storm drain tie-in at $500 to $3,500.
• Clay. The national guide notes clay is harder to dig. The USDA describes Lake Charles clay, common across the area, as 45 to 60% clay with very slow permeability once wet.
• Obstacles. Patios, sprinkler lines and planted beds may need lifting and putting back.
• Permits and utilities. The guide lists permits at $58 to $225. Texas also asks you to call 811 at least two days before digging deeper than 16 inches, and the call is free.

What does a well-designed foundation drainage system include?

A sound residential drainage design has four parts: ground that falls away from the house, a collection trench with perforated pipe in clean gravel, filter fabric around it, and a solid outlet pipe running downhill to daylight or an approved drain.

The federal Building America guide gives the detail for a footing drain. The trench is at least 16 inches wide and 16 inches deep for a 4-inch pipe. Washed gravel goes 6 inches under the pipe and 6 inches over it, the pipe sits perforations down, and geotextile filter fabric wraps the whole bundle to keep silt out. The water should leave at least 10 feet from the foundation.

Grading comes first. The residential code Texas uses, section R401.3, says the ground must fall at least 6 inches within the first 10 feet of the foundation, and hard surfaces within 10 feet must slope away at 2% or more. Cheaper surface fixes are covered in drainage around a house foundation.

Which foundation drainage system is best for a Houston home?

For most Houston homes the best system is the simplest one that moves water off the clay: correct grading, gutters and downspouts that empty well away from the slab, then an exterior French drain where water still collects. That order costs least and fixes the cause. Deep perimeter systems and pumps make sense only where water has nowhere to run by gravity.

Low, flat neighborhoods test this hardest. During Hurricane Harvey, the Harris County Flood Control District measured 47.4 inches of rain in four days at Clear Creek and I-45, near Clear Lake. No home drain is sized for that, but a good system clears normal storms before water soaks under the slab.

Balance matters too. Expansive clay shrinks when it dries, so draining one side hard while the rest bakes can create a new imbalance. Some owners pair drainage with slow watering in drought, as described on soaker hoses for a foundation.