How to build a DIY inground pool

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Introduction

Dreaming of your own backyard oasis without the high contractor fees? Building a DIY inground pool is a big project—but with the right planning, tools, and determination, it can be done. This guide will walk you through how to build a DIY inground pool step by step, covering everything from excavation to finishing touches. Whether you’re looking to save money or take on a personal challenge, here’s how to turn that dream into a reality.

Why Building a DIY Inground Pool Matters

An inground pool can add value to your home, create a space for family fun, and offer year-round enjoyment. By going the DIY route, you can:

  • Save tens of thousands of dollars
  • Customize your design and features
  • Learn valuable skills
  • Control the timeline and materials used

That said, building your own pool requires significant time, planning, and labor. But with patience and care, it’s a rewarding project that pays off for years to come.

Step-by-Step Guide to Building a DIY Inground Pool

Step 1: Design Your Pool and Check Local Permits

Before breaking ground, plan your pool thoroughly.

  • Choose the pool type: concrete (gunite), vinyl liner, or fiberglass shell.
  • Decide on the size, shape, and depth.
  • Consider features like stairs, tanning ledges, or a deep end.
  • Research zoning laws, HOA rules, and permit requirements in your area.

💡 Tip: Submit pool plans to your local building department and utility companies before digging.

Step 2: Mark the Layout and Excavate

Once approved:

  • Mark your pool’s outline using spray paint, stakes, and string.
  • Rent or hire a backhoe or excavator to dig the pool area.
  • Excavate to the correct depth and contours, including slope and ledges.

⚠️ Caution: Call before you dig to avoid utility lines!

Step 3: Install Pool Walls or Shell

Depending on your pool type:

Vinyl Liner Pool:

  • Set up steel or polymer wall panels around the perimeter.
  • Bolt and brace panels, ensuring everything is level.

Concrete Pool:

  • Frame the walls with rebar and wood forms.
  • Prepare for gunite or shotcrete application.

Fiberglass Pool:

  • Crane or lower the fiberglass shell into the hole.
  • Adjust with backfill and water simultaneously to avoid shifting.

💡 Tip: Use a laser level to confirm even wall height.

Step 4: Lay Plumbing and Electrical Lines

Plan and install all plumbing and electrical before the pool structure is sealed.

  • Install main drains, skimmers, and return jets.
  • Run pipes to filter, pump, and heater (if used).
  • Lay conduit for lighting and electrical connections.
  • Hire a licensed electrician for all final electrical work.

⚠️ Always follow local code for safety and inspections.

Step 5: Pour or Apply the Pool Base

For Vinyl Pools:

  • Pour a sand-cement mix (called vermiculite or pool base) on the floor.
  • Trowel it smooth as a base for the liner.

For Concrete Pools:

  • Apply gunite or shotcrete using professional equipment.
  • Cure for 7–14 days, keeping it moist to avoid cracking.

For Fiberglass:

  • Backfill around the shell with sand or gravel and water together to maintain pressure balance.

Step 6: Install the Pool Finish

Once the structure is complete:

  • Vinyl Pools: Carefully place and secure the vinyl liner with a vacuum for a smooth fit.
  • Concrete Pools: Apply a pool finish such as plaster, pebble, or tile.
  • Fiberglass Pools: No finish needed—just polish if necessary.

💡 Tip: Install the liner on a warm day to stretch it more easily.

Step 7: Set Up Filtration and Circulation System

Install your:

  • Pump
  • Filter (cartridge, sand, or DE)
  • Heater or heat pump (optional)
  • Chlorinator or saltwater system (optional)

Prime the system, check for leaks, and run water through to test circulation.

🧼 Related Tip: [Learn how to maintain pool water clarity] to get started with weekly pool care.*

Step 8: Fill the Pool and Balance the Water

Once all systems are running:

  • Fill the pool with water using a hose or water delivery service.
  • Test water for pH, alkalinity, and chlorine levels.
  • Add the proper startup chemicals and circulate for 24 hours before swimming.

💡 Tip: Shock the pool and add a stabilizer for best initial water quality.

Common Mistakes to Avoid

1. Skipping Permits and Inspections

Unpermitted pools can lead to fines or forced removal.

✅ Always check with your local building authority.

2. Poor Planning or Improper Excavation

Inaccurate digging can lead to sloped floors, uneven walls, or collapsed sides.

✅ Mark clearly, measure twice, and dig carefully.

3. Using Incorrect Materials

Using regular mortar or adhesives can cause failures in a wet environment.

✅ Use pool-grade materials rated for water submersion.

4. Not Compacting Backfill

Loose soil around fiberglass or vinyl pools can cause settling or wall damage.

✅ Compact soil in layers during backfill for long-term stability.

5. Rushing the Curing or Drying Process

Skipping curing time leads to cracks, leaks, or surface failure.

✅ Follow manufacturer recommendations and allow proper curing.

Extra Tips & Pool Hacks

  • Add a pool cover early on to protect the finish and reduce debris.
  • Install a deck drain to divert water away from your pool structure.
  • Use a smart timer for your pump to reduce energy usage.
  • Consider solar heating mats if a heater isn’t in the budget.

🧱 Related Tip: [Check out our guide on how to repair broken pool tiles] for post-build fixes or upgrades.

Conclusion

Building a DIY inground pool is a big undertaking—but it’s absolutely possible with the right preparation and patience. By following these steps carefully, you’ll create a custom backyard retreat and save thousands in the process. Take your time, do your research, and enjoy the satisfaction of swimming in a pool you built yourself.

👉 Bookmark this guide as your go-to resource during the entire DIY pool project!