Sump Pump & Drainage in Denver, scoped line by line
Sump pump and drainage work in Denver, CO — sump systems, French drains, and grading that move water away from the house, by OnSite crews. Your phone estimate is free; call (773) 900-7007.
Sump pumps and battery backups sized to your water and your basement
Interior and exterior French drains routed to a real outlet
Grading and downspout tie-ins that keep water off the foundation
One accountable crew and a line-item estimate up front
Scoped, priced, approved — then built.
Send photos
Text us a couple of photos of what you're looking at. That's enough to start.
Walkthrough
A Zoom walkthrough of the space — it waives the $149 in-person written estimate.
Line-item estimate
A sectioned estimate with every line priced. You approve every line before any crew arrives.
The build
Our crews run the sequence — demo to punch list — and you sign off on the finished work.
- 01Sump pit
- 02Pump set
- 03French drain
- 04Grading
- 05Discharge
Each pass lands in your estimate as its own priced section — nothing hides in a lump sum.
Get your sump pump & drainage estimate
Your phone and text estimate is free. An in-person written estimate is $149 — a Zoom walkthrough waives it. On hourly (time-and-materials) jobs, a $129 fee applies per material run. Tell us about the project and we’ll come back with a clear, line-item scope.
The sump pump & drainage estimate, sectioned
- Sump pit
- Pump set
- French drain
- Grading
- Discharge
Every line priced. No lump sums.
Itemized · you approve every lineSump Pump & Drainage in Denver — common questions
Why does my basement flood in Denver?
Usually grading, downspouts, or a failed sump — not one mystery. We find where the Denver, CO water comes in and price the fix to the cause.
Do I need a battery backup for my sump pump?
If a power outage during a storm would flood you, yes — we size a backup so the pump keeps running when the grid does not.
Do I get a written, line-item estimate for sump pump & drainage?
Yes — you get a sectioned, itemized estimate before any commitment, so you see exactly what each part of the work costs. No lump sums, no surprise change orders.
Are OnSite crews licensed and insured?
Yes. Every OnSite crew is insured, bonded, and background-checked, and one accountable team stays with your project from the first estimate to the final walkthrough.
Do you offer financing?
Yes — financing is available through licensed lending partners, so you can spread the cost over time. It's optional and there's no obligation; we can set it up once your estimate is ready.
Is the estimate really free?
Yes. Your estimate is free and there's no obligation — we scope and price the work up front so you can decide with the full picture in hand.
More work we take on in Denver
Terms & disclosures — Colorado
OnSite General Contracting operates under Colorado state and local licensing. Estimates and contracts follow Colorado consumer-protection law.
- Colorado contracts disclose payment schedule and lien-law rights before work begins.
- Roofing work follows Colorado SB 38: no waiver of insurance deductibles; right to rescind a roofing contract if a claim is denied.
- Right to cancel within 3 business days for eligible door-to-door sales.