Tenant Submeter Estimator
A tenant water submeter measures how much water a single apartment, condo, or mobile-home lot actually uses, so the owner can bill each tenant for real consumption instead of dividing one master-meter bill by formula (RUBS) or burying it in rent. Submetering tends to cut overall use because residents see their own usage. The big cost driver is the number of units, then the read system - a basic mechanical meter you read by hand, an encoder / remote register, an AMR wireless system, or smart / cloud meters tied to automated billing - and how easy the supply piping is to reach. Florida allows residential submetering with limited billing surcharges, but rules and local restrictions vary.
Many Florida multifamily buildings have one master meter from the utility, and the owner either absorbs water in the rent or splits it by a RUBS formula (ratio utility billing - allocating the bill by occupancy or square footage).
What Submetering Changes
A submeter on each unit measures actual use, so tenants pay for what they use. That visibility usually reduces total consumption and is fairer than a flat split, but it adds meters, reads, and billing to manage.
A submeter is an inline meter placed on the supply line feeding a single unit (or lot). The easy case is an exposed line where the unit's water is already isolated.
When It Gets Involved
If a unit's water is not on its own branch, isolating it can require a manifold or re-pipe, and reaching the line may mean opening a wall or ceiling. A unit shutoff valve at the meter is common so each unit can be isolated for service.
Residential water submetering is allowed in Florida, and owners may pass through the utility's charges; a limited billing surcharge for reading and billing is permitted in many situations, though not everywhere.
Rules Vary
The Florida Public Service Commission / Administrative Code governs submetering and what can be billed, Chapter 83 landlord-tenant law affects disclosure, and some local governments restrict RUBS or submeter billing. Confirm the current rules with the PSC, your water provider, and the AHJ before relying on a billing model.
A basic mechanical submeter is cheapest but has to be read by hand at each unit. An encoder / remote register lets the meter be read from a more accessible point.
Automated Reads
An AMR / wireless system collects reads remotely, and smart / cloud meters feed an automated billing platform - more upfront cost per meter, far less labor every billing cycle, and fewer access issues in occupied units.
The single biggest install variable is how the building's water distribution is laid out. Where each unit already has its own accessible branch, a submeter drops in cleanly.
Harder Layouts
Older buildings often run shared or looped piping, so isolating one unit takes a manifold or partial re-pipe, and concealed lines mean opening and patching finished surfaces. Park and lot metering adds outdoor service runs and sometimes trenching.
Best Time: During A Repipe Or Renovation
The cleanest time to submeter is during a building repipe or renovation, when the distribution is already open and units can be isolated.
Typical Install
1. Map the water distribution and confirm each unit can be isolated. 2. Add a manifold or re-pipe where needed. 3. Set the submeter and a unit shutoff on each unit's supply. 4. Add backflow protection where required. 5. Commission the read system (manual, AMR, or smart). 6. Set up reads and billing per the applicable rules.
FL Gotchas
Metering before confirming a unit is truly isolated, skipping backflow protection, no plan for reads in occupied units, and assuming a billing surcharge is allowed without checking local rules.
Submetering is a system, not just hardware: the reads and billing have to keep running accurately and within the rules.
Routine Care
Read on a consistent cycle (or let AMR / smart meters do it), reconcile submeter totals against the master meter, watch for stuck or drifting meters, and keep disclosures and any surcharge within what the PSC and local rules allow.
Warning Signs
Submeter totals that drift far from the master meter, a meter that stops advancing, tenant disputes over reads, or a billing surcharge that exceeds what is permitted locally.
This is the submetering plumbing and meters plus professional labor in the FL market - the billing platform and ongoing service are separate line items. These are planning estimates.
Scope & System
A single accessible unit with a basic mechanical meter is the low end; a larger building or park with many units, smart / cloud meters, manifolds, and concealed-line access is the high end.
Add-ons
Unit shutoffs, backflow protection, billing-system setup, and additional units each add. Use the calculator to combine the scope, the read system, pipe access, and add-ons.
FL Permit Requirements
- Adding an inline submeter on an accessible, exposed supply line
- Replacing a like-for-like submeter or read register
- Adding a unit shutoff valve at the meter
- Opening walls / ceilings or re-piping to isolate a unit
- New manifolds tying into the building water distribution
- Backflow / cross-connection protection on the supply
- Park / lot metering with new service runs or trenching
FL County Permit Fee Reference
Adding an inline submeter on an accessible line or replacing a like-for-like meter is usually minor. Re-piping or adding manifolds to isolate units, opening finished surfaces, tying into the building water distribution, backflow protection, or park lot metering with new service runs is regulated and often permitted. Submetering and tenant-billing rules are separate from the building permit - verify both with your AHJ, the Florida PSC, and your water provider before starting. Fees and timelines are approximate.
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FL Code References
Who Can Pull a Permit in FL?
Tenant submetering has two separate layers in Florida. The plumbing - isolating a unit's supply, the meter connection, valves, and any backflow protection - follows the adopted Florida Building Code (Plumbing), the manufacturer's instructions, local amendments, and the AHJ, and re-piping or manifold work is permitted and inspected. The billing side - charging tenants for water, any surcharge, and disclosure - follows the Florida Public Service Commission / Administrative Code submetering rules and Chapter 83 landlord-tenant requirements, and some local governments add their own restrictions on submeter or RUBS billing. Adding a meter on an accessible line is usually minor; re-piping, new manifolds, and park service runs are not. Per FL Statute 489.105, regulated plumbing work is performed by the appropriate licensed contractor; confirm billing rules with the PSC and your water provider.
Verify any contractor's license at myfloridalicense.com and confirm requirements with your local building department before work begins.
Get a Free Tenant Submeter Estimate
Licensed FL Contractor - Multifamily & Lot Water Submetering
We install water submeters for apartments, condos, and mobile-home lots — mechanical, AMR wireless, or smart / cloud billing meters — with unit shutoffs and proper backflow protection, so you can bill each tenant for actual use within Florida's submetering rules.