Roof water pouring out beside the slab?
Every downspout drops the water from one stretch of roof in one spot. Left on a splash block, that water soaks into the clay beside the slab, cuts a channel in the bed or runs toward the neighbor’s yard.
Clay Plano Drainage Company installs underground downspout drainage across Plano and nearby cities. Our typical range is $300 to $800 per downspout, and your written estimate from the site visit sets the actual figure.
What one downspout line includes
The range covers one downspout, from the gutter outlet at the bottom of the downspout to the place the water leaves the lot. Here is what goes into it:
- The adapter. A fitting that joins the downspout to buried pipe, with a cleanout where the line needs one.
- The trench. A narrow cut, sod lifted in strips and set aside, soil piled on tarps.
- Solid 4-inch pipe. Roughly 10 to 30 feet, laid at a steady fall away from the house.
- The outlet. An emitter that pops open in the lawn, a connection into a drain line you already have, or a curb outlet where the city permits it.
- The test. Water run down the line to the outlet before backfill.
Gutter repairs and long manifolds that gather many downspouts into one pipe are outside this range and priced on their own.
Why solid pipe, not perforated
A downspout line carries water away; it isn’t meant to collect any. Perforated pipe would leak roof water back into the soil along the way, often right along the house, which is the opposite of the point.
In Plano clay that matters more than most places. Houston Black clay swells when wet and shrinks when dry, so steady roof water beside the slab is the last thing you want. We use solid pipe from the downspout to the outlet.
What moves a downspout price
Most downspout lines land inside our range. These are the things that decide whether yours sits low or high.
| What we look at | A line lands lower when | A line lands higher when |
|---|---|---|
| Run length | The outlet is 10 to 15 feet away in open lawn | The line has to run 30 feet or more to reach the street side |
| Depth | The lot falls away from the house, so the pipe can stay shallow | Flat ground means starting deeper to keep the fall |
| Outlet | An emitter or a working line just a few feet off | The line ends at the curb, which brings a right-of-way permit |
| Crossings | Only lawn between the downspout and the outlet | A walk or driveway has to be bored under or cut and patched |
| What’s in the ground | Clay all the way | Chalk or large roots in the trench line |
| Downspouts done together | Several lines share trench, setup and an outlet | A single line carries all of that work alone |
Where a downspout line can let out
The outlet decides as much of the price as the pipe. In Plano, house lots are designed to drain to the street, and the city’s Stormwater Design Manual does not permit draining one lot onto the next.
So most downspout lines head toward the front lawn or the curb:
- Front lawn. An emitter in open lawn on the street side of the lot, where the fall reaches it.
- Curb. A curb outlet is work in the public right-of-way and needs the City of Plano’s Engineering Permit for public infrastructure.
- Nearby cities. Some set their own limits. In Prosper, a curb core needs a permit and is limited to one per lot, no more than 3 inches across.
Richardson’s city guidance adds a useful habit: let roof water pass across lawn or gravel before it leaves the property, where the layout allows. Our guide on where yard drain water can go sets out every outlet option.
What’s inside a Plano downspout drainage price
A downspout line is a small job, so labor and the outlet make up most of it.
| Piece of the job | What drives it | Public figure, or how we price it |
|---|---|---|
| Trenching and laying pipe | Run length, depth and the fall the pipe needs | Pipelayers: $22.84 mean hourly pay in the Dallas-Fort Worth area, $26.30 for the U.S. (BLS, May 2025) |
| Hand digging near the house | Beds, AC pads and tight gaps along the slab, where a machine won’t fit | Construction laborers: $21.05 mean hourly pay locally, $25.02 for the U.S. (BLS, May 2025) |
| Adapter, pipe, fittings and emitter | Length of solid 4-inch pipe and the outlet type | Inside our per-downspout range |
| Curb outlet | City of Plano Engineering Permit for public infrastructure, for work in the right-of-way | Fee set by the city and listed separately |
| Locates | Texas811 flags buried lines before the trench opens | Done on every job |
| Bed and walk restoration | Mulch, edging, rock or a walk crossed by the line | Priced on your estimate if the line crosses them. Landscaping workers: $19.09 mean hourly pay locally, $20.33 for the U.S. (BLS, May 2025) |
The Bureau of Labor Statistics figures show local hourly wages below the national means for every trade here. What moves a downspout price in Plano is distance, crossings and the outlet.
Hourly pay and what a homeowner is billed are different numbers: a wage is not a billing rate. Billing also has to cover insurance, vehicles and tools, permits, supervision and the time each visit takes.
Illustrative budgets
Everything in this table is illustrative: a count of lines times our per-downspout range. None of it is a quote or a record of a past job.
| Layout | The arithmetic | Illustrative total |
|---|---|---|
| One back-corner downspout piped about 25 feet to an existing line that reaches the street | 1 line at $300 to $800 | $300 to $800 |
| Three downspouts along the back of the house, each piped toward a pop-up emitter in the side or front lawn | 3 lines at $300 to $800 each | $900 to $2,400 |
| Four downspouts, two at the front and two at the back, each with its own buried line | 4 lines at $300 to $800 each | $1,200 to $3,200 |
When roof water and a low spot in the lawn meet in one place, a catch basin can take both, and the catch basin cost guide shows how that adds up.
When roof water is a slab question
If you are piping downspouts because of cracks, sticking doors or gaps at the slab, the drainage still matters, but it is not structural repair. Water management around the house is covered on our foundation drainage page.
The guide to foundation moisture in clay soil explains how steady water near the slab and shrink-swell clay relate. If a neighbor says your downspouts send water onto their lot, the neighbor runoff guide covers what Texas law says.
Run the numbers before the visit
Enter your downspout count, run length, any concrete in the way and how far the outlet is, and the drainage cost estimator returns a planning range built on our rates.
Your price comes from the written estimate, once the visit has measured the fall and found each outlet. Other jobs are covered in drainage cost in Plano. Questions about your downspouts? Call (469) 551-8518, or use the form below to send a few photos.