How Much Does It Cost to Add Full Hookups to an RV Park?

August 14, 2026 · RV park investing, explained

Public domain, via Wikimedia Commons

Adding full hookups (water, sewer, and 30/50 amp electric) to an RV park typically runs $8,000 to $20,000 per site if the park already has some infrastructure nearby, and $150,000 to $500,000 or more in site-wide costs if you're bringing in new electrical service, a well or water system, or a septic plant from scratch. The per-site number is what most investors quote each other at conferences. The site-wide number is what actually determines whether the deal pencils.

What you need

• A current site survey or plat showing existing utility runs, easements, and pad locations
• A soil or perc test if you're on septic, or a capacity letter from the municipal sewer authority if you're on city sewer
• An electrical load assessment from a licensed electrician or the local utility, showing whether the existing service (often 200-400 amp for older parks) can support 30 and 50 amp pedestals at every site
• Water source capacity data - well yield in gallons per minute, or a tap and meter size confirmation from the municipal water provider
• At least two contractor bids each for electrical, plumbing/sewer, and grading/excavation
• Materials on the pad: 30/50 amp combo pedestals ($400-$900 each installed), 1.5-2 inch Schedule 40 PVC for water lines, 4 inch PVC or ABS for sewer laterals, and direct-bury electrical conduit rated for the trench depth in your area (often 18-24 inches minimum, more where frost lines run deep)
• Local health department and building permits, which in many counties require an engineer's stamp on septic and sometimes on electrical service upgrades over a certain size

Step by step

1. Confirm capacity before you price anything else. Call the utility company and ask what it costs to upgrade or extend service to the number of amps you need. This single answer often makes or breaks the project. A straightforward pedestal-to-pedestal wiring job might run a few thousand dollars per site. A full service upgrade from the utility, including a new transformer, can cost $50,000-$150,000+ and take months, since utility companies schedule this work on their own timeline, not yours.
2. Get the engineering and permits locked in. If you're expanding a septic system or adding a lift station, budget $5,000-$25,000 for engineering and design alone, before construction. Health departments in many states also cap the number of sites per septic system based on soil type, so this step can change your site count, not just your budget.
3. Do the trenching and underground work first, in one pass. Water, sewer, and electric conduit should go in the same trench where code allows, since re-opening a trench later to add a missed line roughly doubles the labor cost for that run. Trenching typically runs $8-$25 per linear foot depending on soil, and rock or high water tables push that number up fast.
4. Install pedestals, tanks, and pad connections last. This is where the visible cost per site shows up: pedestal, meter, backflow preventer, sewer riser and cap, and the concrete or gravel pad tie-in. Budget $2,000-$6,000 per site for this finishing stage, on top of the trunk-line costs already spent.

Put together, a 50-site park adding full hookups where none existed before might see $250,000-$600,000 in total project cost. A park that already has partial hookups (water and electric, no sewer, for example) and just needs to add the missing service can often do it for $60,000-$150,000 for that same 50 sites, because the trenching and electrical service are already in place for two of the three utilities.

Where this goes wrong

The most common budget-buster is the electrical service upgrade. Investors price the pedestals and wiring per site and forget that the park's main electrical service, the transformer and panel feeding the whole property, may not have the capacity to support 50 amp service at every site. Finding this out mid-project, after trenching is already done, is expensive and slow.

Septic is the second big one. A perc test that comes back marginal, or a health department that caps site density based on soil absorption rates, can shrink your planned site count or force a more expensive system (aerobic treatment unit instead of a standard leach field, for example). That difference can run tens of thousands of dollars and change the return math on the whole project.

Rock and high water tables are the quiet cost inflators. A trenching bid based on typical soil can double once the crew hits rock or has to dewater a trench before laying pipe. This is one of the reasons contractor bids vary so widely on the same job.

Permitting delays cost money even when nothing is being built. Carrying costs on a property mid-renovation, plus lost rental income from sites that are out of service during construction, add up. A project that was supposed to take three months and stretches to eight months because of permit review backlogs is common enough that it should be built into the timeline from the start, not treated as a surprise.

Finally, sequencing mistakes cost real money. Pouring concrete pads before the utility rough-in is finalized, or backfilling a trench before an inspector signs off, means redoing work that didn't need to be redone.

When to stop and call someone

Any work on the electrical service size coming into the park, meaning the main panel, the transformer, or the service entrance, needs a licensed electrician and often direct coordination with the utility company. This is not a place to save money with an unlicensed contractor, both for safety and because most utilities won't energize service they didn't inspect or approve.

Septic system design and any system serving more than a handful of sites needs a licensed engineer, and in most states this is a legal requirement, not a suggestion. The same goes for any lift station or pressurized sewer system.

If you're not sure whether your water source, well or municipal tap, can handle full-occupancy demand across all sites, get a capacity study done before you commit to a site count. Guessing on water capacity is how parks end up with low pressure complaints from guests during peak season, which is a harder problem to fix after the fact.

For investors evaluating a deal from the outside, the honest move is to get real bids before underwriting the project, not industry rule-of-thumb numbers pulled from a forum post. Every park's soil, existing infrastructure, and utility company add enough variance that a number that worked for one property two states away may be off by a factor of two for yours. This is the kind of due diligence work we walk through with investors at Invest With Zac, because the difference between a $150,000 upgrade and a $400,000 upgrade is the difference between a good deal and a bad one.