# Sunnyvale, TX drainage contractor, where the town inspects private drains by the foot

> Drainage contractor in Sunnyvale, TX: French drains, regrading and culvert tie-ins planned around the town's grading permit and per-foot inspection. Call us.

URL: https://clayplanodrainagecompany.com/service-areas/sunnyvale/

Drainage contractor in Sunnyvale, TX: French drains, regrading and culvert tie-ins planned around the town's grading permit and per-foot inspection. Call us.

Last Updated: November 11, 2026

- **Permits:** Town of Sunnyvale Engineering (grading, floodplain and culvert permits)
- **Storm drainage:** Town of Sunnyvale (streets, drive approaches and culverts)
- **The rule that changes the job:** $300 culvert permit

## What usually starts a drainage job in Sunnyvale

### A private drain the town still inspects

The drain sits entirely on your land, away from the house. Sunnyvale's fee schedule still lists inspection of drainage structures outside the building footprint, private systems included, by the linear foot.

### A big lot that needs regrading

The yard has settled flat or tilts toward the house across a wide area. Sunnyvale's grading permit carries a base fee per acre, so the size of the job shows in the fee.

### A culvert under the drive

Water from the yard has to pass a driveway culvert and headwall on its way out. Work on those goes through the town's own permit.

### Water near a floodplain

Part of the lot sits low near a creek or mapped floodplain. Sunnyvale handles grading and floodplain development under one permit, so we check the maps first.

## Water pooling on a big lot?

A low corner that stays wet, a slope that sends water back at the house, a ditch that won’t clear: on a wide lot each one starts with where the water is trying to go, and how far it has to travel.

[Clay Plano Drainage Company](https://clayplanodrainagecompany.com/) installs French drains, catch basins and yard regrading in Sunnyvale.

## Private drains, public inspection

One Sunnyvale detail is easy to miss. The town’s engineering fee schedule lists inspection of drainage structures outside the building footprint, private systems included, and it charges that inspection per linear foot.

So a drain that never leaves your lot can still be one the town looks at. We confirm what applies to your address and plan the job around it:

| Part of the job | What Sunnyvale’s schedule lists | How it shows in our estimate |
| --- | --- | --- |
| Drainage structures outside the footprint | Inspection per linear foot | Route length and inspection on their own lines |
| Grading or work near floodplain | Grading or Floodplain Development Permit, base fee per acre | Permit line sized to the area we regrade |
| Culvert, headwall or drive approach | Permit at $300, inspection included | Separate line when the outlet touches it |

Because the inspection is by the foot, a shorter, smarter route saves you money twice: fewer feet of drain and fewer feet to inspect.

## Keeping the route short

On a wide Sunnyvale lot, the first instinct is often a long French drain from the back fence to the street. Sometimes that’s right. Often a closer outlet or a different tool does the job with less pipe.

- **[A catch basin](https://clayplanodrainagecompany.com/catch-basins/)** at a single low spot, piped a short way to open ground.
- **[Regrading](https://clayplanodrainagecompany.com/yard-grading/)** to move surface water across the lawn without any pipe at all.
- **[A French drain](https://clayplanodrainagecompany.com/french-drain-installation/)** only where water soaks in along a strip and has to be collected underground.

The guide to [French drain vs catch basin](https://clayplanodrainagecompany.com/guide/french-drain-vs-catch-basin/) explains how we choose between the two.

## Low ground near a creek

If part of your lot runs down toward a creek or a mapped floodplain and the back of the yard floods, the cause may be the creek rising, not rain that has no path out.

Those are different problems. Yard drainage moves rain off your lot; it can’t hold back a creek. And grading in floodplain falls under the town’s floodplain development permit. We check the maps for your address first, and our guide to [floodplain or a drainage problem](https://clayplanodrainagecompany.com/guide/floodplain-or-drainage-problem/) shows how to tell them apart.

## Culverts and drive approaches

Where a yard drains toward the road past a driveway culvert and headwall, the culvert becomes part of the job.

When the yard drain ends at it, or the culvert needs work for the water to pass, Sunnyvale’s culvert and headwalls/drive approach permit applies. Its listed fee is $300, inspection included. On the visit we check both ends of the culvert:

- **A blocked or buried inlet** holds water upstream, and no yard drain fixes that until the culvert flows.
- **A sagging or crushed pipe** slows the flow even when both ends look clear.

## Soil and weather

We probe the soil on the first visit. Heavy clay that sheds water slowly calls for a wider stone zone and fabric to keep fines out of the pipe; a looser soil drains through the trench walls and can take a lighter build.

Rain here peaks in spring and fall. On the nearest long records, at Plano and Richardson, May and October are the wettest months. A storm in either is a good time to film the yard.

### When an old drain stopped working

A buried line that used to work and now doesn’t is often clogged or crushed in one section. [Drain repair](https://clayplanodrainagecompany.com/drainage-repair/) starts with a flush or camera to find the spot, and we price the repair once we’ve seen it.

## Next door to Sunnyvale

Sunnyvale lies along US 80, with Belt Line Road and Town East Boulevard crossing it. The towns around it write their own drainage rules:

- **[Mesquite](https://clayplanodrainagecompany.com/service-areas/mesquite/)** exempts existing single-family lots under one acre from its grading permit.
- **[Rowlett](https://clayplanodrainagecompany.com/service-areas/rowlett/)** requires a grading permit for adding, removing or moving dirt on a lot.
- **[Garland](https://clayplanodrainagecompany.com/service-areas/garland/)** needs engineering approval for fences in a floodplain or drainage easement.

## How the job runs

We find the source, then the outlet, then the shortest route that keeps its fall. On a Sunnyvale job the inspection is part of that schedule.

1. **Trench and lay** the drain with the sod set aside and the soil on tarps.
2. **Water test** the whole system and fix any low spot.
3. **Inspection** by the town where it applies, with the trench still open.
4. **Backfill and restore**, then a walk along the finished route with you.

The guide to [what happens during a drainage installation](https://clayplanodrainagecompany.com/guide/what-happens-during-drainage-installation/) explains each step in more detail.

### What the inspection means for your yard

An inspection step changes the rhythm of the job a little. The trench, pipe and stone stay visible until the town has looked, so part of the lawn may stay open longer than on a job with no inspection.

We stage the work so the open section is as short as the schedule allows, and the sod stays rolled and watered nearby.

## Before the visit

The more we know about the lot, the better the first visit goes. Along with photos or a storm video, tell us:

- **Roughly how large the lot is**, since the town’s grading fee is figured per acre.
- **Whether a creek or low field** borders the property.
- **Where the driveway culvert is** and whether water stands at either end of it.
- **Any older buried drain** that has stopped working, so we can flush or camera it before suggesting a new one.

## Drainage services in Sunnyvale

- [Service**French drains** A trench of washed stone and pipe that collects water held in the soil and carries it to a legal outlet at the street side of the lot.](https://clayplanodrainagecompany.com/french-drain-installation/)
- [Service**Yard grading** Reshaping the soil so the ground falls away from the slab and toward a swale or the street, set to measured slopes instead of guesswork.](https://clayplanodrainagecompany.com/yard-grading/)
- [Service**Yard drainage systems** One planned route that collects roof, surface and soil water from several parts of the yard and carries it in solid pipe to a legal outlet.](https://clayplanodrainagecompany.com/yard-drainage/)
- [Service**Catch basins** A grated box set at the lowest point of a lawn, bed edge or patio that takes in surface water and sends it through solid pipe to an outlet.](https://clayplanodrainagecompany.com/catch-basins/)
- [Service**Downspout drainage** Buried solid pipe that takes roof water from each downspout past the beds and the slab to a pop-up emitter, an existing line or a permitted curb outlet.](https://clayplanodrainagecompany.com/downspout-drainage/)
- [Service**Drain repair and cleaning** Finding why an existing French drain, yard drain or downspout line stopped working, then cleaning it, repairing the failed section or redesigning what never worked.](https://clayplanodrainagecompany.com/drainage-repair/)

## How a job usually runs in Sunnyvale

### Address and lot size

Send the address, roughly how big the lot is and photos from the last rain. Lot size and any floodplain on it tell us which town permit the work will need.

### Site visit

We walk the yard, probe the soil, measure the fall and find the outlet. The written estimate shows the route length, the permits and the inspection line.

### Permit and locates

We arrange the grading or culvert permit the job needs. Texas811 marks the utilities, and we paint the drain route in white.

### Build, inspect, restore

We trench narrow with sod set aside, run water through the system, leave it open for the town's inspection where required, then backfill and restore the yard.

## Neighborhoods, landmarks and routes

### Routes

- US 80
- Belt Line Road
- Town East Boulevard

## Sunnyvale: questions

### Does Sunnyvale inspect a French drain on private property?

Sunnyvale's engineering fee schedule lists inspection of drainage structures outside the building footprint, private systems included, charged per linear foot. We confirm what your address needs and plan for the inspection before backfill.

### What does the Sunnyvale culvert permit cost?

The town's fee schedule lists the culvert and headwalls/drive approach permit at $300, inspection included. If your drain ties into or changes a driveway culvert, that permit is its own line in the written estimate.

### How much does a French drain cost in Sunnyvale?

We use the same rates across the area. A French drain typically runs $25 to $60 per foot, a catch basin with a short pipe run $500 to $1,500 and a whole-yard system $3,000 to $8,000 per project. Sunnyvale's permit and inspection fees are added as separate lines, and the site visit and written estimate set yours.

### Is the grading permit fee in Sunnyvale based on acreage?

Yes. The Grading or Floodplain Development Permit has a base fee per acre on the town's schedule. On a large lot that makes the area being regraded part of the cost, so we draw the regrading to the ground that needs it.

### My Sunnyvale yard floods near the creek. Is that a drainage problem?

It may be floodwater, not yard drainage, and the two have different fixes and rules. We check whether the low area is mapped floodplain before we suggest anything, because grading there falls under the town's floodplain development permit.

## Nearby service areas

- [City of Mesquite City Engineer (grading and floodplain development permits)**Mesquite**](https://clayplanodrainagecompany.com/service-areas/mesquite/)
- [City of Rowlett Development Engineering (grading and right-of-way permits)**Rowlett**](https://clayplanodrainagecompany.com/service-areas/rowlett/)
- [City of Garland Engineering (right-of-way and easement permits)**Garland**](https://clayplanodrainagecompany.com/service-areas/garland/)

## Guides for yards in Sunnyvale

- [Learn**Is it a floodplain problem or a yard drainage problem?** A flooded back yard by a creek and a flooded back yard on a flat lot look alike from the patio. Where the water came from decides who can fix it, and what a yard drain can and can't do.](https://clayplanodrainagecompany.com/guide/floodplain-or-drainage-problem/)
- [Decision Guide**Where do you drain a French drain in Plano?** The outlet decides the design, so we choose it first. Every option a Plano yard has, what each one needs, and how to pick when the lot is flat.](https://clayplanodrainagecompany.com/guide/where-can-yard-drain-water-go/)
- [Decision Guide**Do you need a French drain or a catch basin?** One works below ground and slowly, the other at the surface and fast. A simple timing test tells you which problem you have, and some yards need both on one line.](https://clayplanodrainagecompany.com/guide/french-drain-vs-catch-basin/)
- [Learn**What happens during a drainage installation?** From the first look at the yard to the last walk along the route. What we do at each stage, what we ask of you, and what the lawn looks like when we leave.](https://clayplanodrainagecompany.com/guide/what-happens-during-drainage-installation/)

## Get an estimate in Sunnyvale

Tell us what the water is doing and where the house is in Sunnyvale.