A sump pump battery backup costs $900 installed on average, with most homeowners paying $600 to $1,200.1,3 HomeGuide puts installed systems at $600 to $2,000+ depending on capacity.2 Prices below are national averages* for 2026.
*National averages, not local quotes. Your price depends on pumping capacity, battery type and local plumber rates.
$900
average installed (Angi, Forbes)
$600–$2,000+
installed range (HomeGuide)
$100–$400
battery alone
$120–$200
labor (Angi)
What sources say
| Source | Figure | Notes |
|---|---|---|
| Angi | $900 average, $600 – $1,200 installed | Labor $120 – $200 |
| Forbes | $900 average, $600 – $1,200 | Identical figures to Angi, so one dataset |
| HomeGuide | $600 – $2,000+ installed | Also prices water-powered and combo backups |
| The Basement Guide | $800 – $2,200 installed | Independent; compares battery vs. water-powered |
Backup type compared
| Type | HomeGuide installed | Basement Guide installed |
|---|---|---|
| Battery-powered | $600 – $2,000+ | $800 – $2,200 |
| Water-powered | $300 – $1,000 | $500 – $1,200 |
| Combo (primary + backup) | $1,000 – $3,000 | $1,500 – $3,000 (dual setup) |
Water-powered backups need no battery but require municipal water pressure and add $20 to $60 to the water bill when they run, per The Basement Guide.4
Pumping capacity (Angi)
| Capacity | System cost | Moves up to |
|---|---|---|
| Low | $200 – $400 | 1,000 gallons per hour |
| High | $400+ | 2,200 gallons per hour |
Homes with significant water intrusion need the high-capacity tier.1
Battery types
| Battery | Cost | Lifespan |
|---|---|---|
| Flooded (wet cell) | $100 – $200 | 3 – 5 years (HomeGuide) |
| AGM / deep-cycle | $200 – $400 | 4 – 7 years (HomeGuide); Angi rates deep-cycle at 10+ years |
| LiFePO4 lithium | $200 – $500 | Longest life per The Basement Guide |
Sources disagree on deep-cycle lifespan, so follow your battery maker’s replacement schedule rather than a generic number.1,2,4
DIY or hire
Swapping in a backup unit beside an existing sump pit is a manageable DIY job, but new discharge plumbing and check-valve work are usually hired out. Forbes notes a $600 DIY kit costs about the same as a basic professional install.3 The Home Depot sump pumps category shows current backup system pricing.
Related guides
Sump Pump Installation Cost
Sump Pump Repair Cost
Basement Waterproofing Cost
All cost guides
Sources
1. Angi — Sump Pump Battery Backup Cost
2. HomeGuide — Sump Pump Battery Backup Cost
3. Forbes — Sump Pump Battery Backup Cost
4. The Basement Guide — Battery vs. Water-Powered Sump Pumps