You’re ready to build a custom pool. You’ve been thinking about it for months, maybe years. You can already picture summer afternoons with your family, the sound of water, the feeling of finally having that backyard retreat.
But here’s what most homeowners don’t realize until it’s too late: the decisions you make before a single shovel hits the ground will determine whether your pool lasts 50 years or starts showing problems in five.
At Century Pools, we’ve been building custom gunite pools since 1964. We’ve seen what works and what fails. We’ve watched pools age beautifully and we’ve seen others require expensive repairs because critical steps were rushed or skipped.
This guide walks you through what actually matters during each phase of your pool project—not the glossy brochure version, but the real insights from six decades of building pools that families cherish for generations.
The Question Nobody Asks (But Everyone Should)
When homeowners first call about building a pool, they want to talk about shape, size, and finishes. They’re excited about design.
What they almost never ask about: how their yard’s soil and drainage conditions will impact the pool’s long-term performance.
This isn’t glamorous. It won’t show up in your Instagram photos. But it’s the difference between a pool that lasts decades and one that develops cracks, settling issues, or plumbing problems within a few years.
Here’s why this matters: groundwater higher than the lowest point of an inground pool can exert buoyant forces that may literally cause an empty pool shell to float out of the ground, resulting in catastrophic failure.
Your soil isn’t just dirt. It’s the foundation that will support thousands of gallons of water for the next 50 years.
What to Look for Before You Even Call a Contractor
You can identify potential soil and drainage issues yourself before construction begins. Walk your yard after a heavy rain and look for these red flags:
- Areas where water collects and pools instead of draining away
- Spots that feel soft or spongy underfoot when you walk on them
- Uneven settling near existing patios, driveways, or fences
- Cracks in hardscapes that suggest soil movement
- Leaning trees or fence posts indicating unstable ground
- Small slopes or dips that might seem insignificant but affect drainage
One project we worked on looked perfectly level at first glance. But during the initial evaluation, we noticed subtle pooling after a recent rain and a slightly spongy feel in one corner.
That signaled unstable soil and poor drainage the homeowners hadn’t noticed.
Because we caught it early, we adjusted the grading, reinforced the foundation, and rerouted drainage before construction began. Had we discovered it mid-build, the pool could have suffered settling, cracks, or plumbing issues—resulting in costly repairs and major delays.
Clay soils can expand when wet and shrink when dry, creating soil movement that causes foundation settlement and cracking. Properties with these conditions often require specialized drainage systems.
Addressing it upfront meant the homeowners got a pool that looked exactly like their vision and was structurally sound for decades.
The First Week: What’s Really Happening Below the Surface
Excavation day arrives. The crew shows up with heavy equipment. Homeowners watch the hole get bigger and think, “Great, we’re making progress.”
But there’s critical work happening that you can’t see.
The crew is carefully staking and marking the exact footprint, excavating to precise depths, and assessing the subgrade for stability. We’re checking for soft spots, unexpected rocks, and proper slope for drainage.
All the plumbing lines are roughed in and graded correctly to ensure proper circulation and water flow.
These early steps determine whether your pool will be safe, functional, and built to last. Even though it doesn’t look like much is happening on the surface, this is when the foundation of your entire project gets established.
Here’s the reality: unexpected challenges during excavation are surprisingly common. Crews could hit hard rock requiring different equipment. They could find unexpected groundwater requiring pumps. Other discoveries include decades-old buried septic tanks, utility lines, or concrete slabs from previous patios.
When the Unexpected Happens
It’s surprisingly common to encounter something unexpected during that first week—soft soil pockets, hidden rocks, or old roots that weren’t visible during the site visit.
When that happens, we pause and assess the situation immediately.
The conversation with the homeowner is straightforward: here’s what we found, here’s why it matters for your pool’s long-term stability, and here’s what adjustments are needed—whether that’s extra reinforcement, additional grading, or rerouting drainage.
We’re upfront about any potential impact on timeline or budget. But we frame it as investing in a safe, durable pool rather than a setback.
Most homeowners appreciate the transparency. They understand that addressing issues early prevents major problems down the road.
⚠️ Important: Utility companies are allowed at least a 3-foot variance in any direction when indicating where lines were laid. When a utility line gets hit, you bear the cost for repair and construction stalls until restoration is complete.
Gunite Day: The Most Critical 24 Hours of Your Project
The day we shoot the gunite shell is one of the most critical points in the entire construction process.
Homeowners often think it’s just spraying concrete. But what really matters is precision, timing, and coordination.
The crew has to apply the material consistently, making sure every wall, corner, and shelf hits the correct thickness and shape. Reinforcement placement, compaction, and the way the mixture is applied all play a role in preventing cracks or structural weaknesses down the road.
Gunite can achieve compressive strengths of 6,000 to 7,500 psi—much higher than standard poured concrete. The high-velocity application compacts the concrete as it hits the surface, creating a denser, less porous shell that helps prevent water infiltration and chemical degradation.
For a homeowner, it’s a noisy, messy day. But understanding that this is the moment your pool’s long-term integrity gets established helps you appreciate why every detail has to be done perfectly.
Weather Can Derail Everything
Weather conditions dramatically impact gunite application. Crews can’t properly shoot gunite if it’s below 40 degrees. Heavy wind poses issues. Lightning threatens crew safety during steel installation or electrical hookup.
One day of bad weather doesn’t translate into one day of construction delay—the actual delays are usually longer.
The Invisible Work That Determines Longevity
Curing immediately after the gunite pour is just as important as the application itself.
Proper curing is all about patience and controlled hydration. Once the shell is sprayed, it needs to be kept moist for several days so the concrete can reach full strength without cracking.
That often means lightly misting the surface and protecting it from direct sun or wind.
If a homeowner or contractor rushes this step—letting it dry too quickly or skipping moisture control—the shell can develop hairline cracks, shrinkage issues, or uneven strength in different areas.
Those problems might not be obvious at first. But over time they lead to leaks, surface flaws, or structural repairs that are costly and disruptive.
Here’s what proper curing actually requires: moist curing for a minimum of seven days after application, with the first 7 days requiring soaking 3-5 times per day. For pools receiving a cementitious finish coating, industry standards recommend continuing moist curing for 28 days.
In one documented case, a pool shell that wasn’t properly watered during curing tested at only 1,250 psi—half of what was required and a fraction of the recommended 4,500 psi. The shell fell apart and had to be completely demolished.
Curing properly is invisible work. But it’s what ensures your pool stands strong for decades.
Choosing a Pebble Finish: Beyond the Color Sample
Once the shell is cured and structurally sound, homeowners face one of their biggest aesthetic decisions—the pebble finish.
Color is just the starting point.
What really matters is texture, aggregate size, and installation quality. A finish that’s applied consistently and troweled correctly will resist wear, staining, and scaling for years. One that’s rushed or uneven can start showing problems in just a few seasons.
Homeowners should also consider how the finish interacts with sunlight. Some colors fade faster or make the water look murky in certain lighting conditions. Darker colors can make the water appear deeper blue, while lighter tones create a tropical lagoon effect.
And there’s the practical side: how it feels underfoot for safety and comfort.
The Longevity Factor
Premium pebble finishes can endure for 25 years or more, surpassing the lifespan of traditional plaster finishes which typically require refinishing every 5-10 years.
But that longevity depends on three factors:
- Installation quality – A finish applied consistently and troweled correctly will resist wear for years. Premium-grade systems typically outperform standard grades by 3-6 years in longevity.
- Water chemistry – pH levels should stay between 7.2 and 7.6, alkalinity between 80 and 120 ppm, and calcium hardness between 200 and 400 ppm. When these levels are too high or low, they lead to scaling, staining, or etching.
- Regular maintenance – Brushing the surface weekly, maintaining proper chemical balance, and addressing stains promptly all extend the finish’s life.
A great pebble finish combines durability, safety, and long-term beauty—not just the aesthetic you see in a small sample at the design meeting.
Timeline Reality: What Actually Affects How Long This Takes
With normal backyard conditions and cooperative weather, most residential gunite pools take 8 to 10 weeks from excavation to completion.
But that’s the ideal scenario.
Construction timeline variables fall into two categories: those under your control and those outside it.
Under your control:
- Time of year you choose to build
- Choosing custom-order materials that must ship long distances
- How quickly you make design decisions at key checkpoints
- Whether you’ve secured HOA approval before construction begins
Outside your control:
- Weather delays (rain, extreme heat, cold)
- Material shortages in the supply chain
- Inspection scheduling with local authorities
- Unexpected site conditions discovered during excavation
After rainfall, soil needs to dry out before crews can proceed. Depending on backyard conditions, ground may take several days to several weeks to be ready.
A sudden downpour can fill an excavated pool hole with water or cause dirt walls to collapse into a muddy pile at the bottom.
Working Effectively With Your Pool Contractor
The best pool projects happen when homeowners and contractors communicate clearly throughout the process.
Here’s what effective communication looks like:
Ask questions when you don’t understand something. If your contractor explains a technical issue and you’re not clear on why it matters, say so. Good contractors want you to understand what’s happening and why.
Respond promptly to decision checkpoints. There are moments in every project where construction can’t proceed until you make a choice—about materials, design adjustments, or how to handle unexpected conditions. Delays in these decisions extend your timeline.
Trust the expertise you hired. When your contractor recommends addressing a soil issue or adjusting the design to accommodate site conditions, they’re drawing on years of experience seeing what works and what fails.
Understand that transparency about problems is a good sign. Contractors who immediately communicate issues and explain options are protecting your investment. The ones who hide problems or rush through solutions create bigger headaches later.
At Century Pools, we view every project as an opportunity to demonstrate our commitment to excellence and earn your trust. We’re honored to continue our family legacy by creating spaces that families cherish for generations.
What Happens After the Pool is Finished
Construction is complete. The water is crystal clear. Your family is ready to jump in.
But there are critical post-construction steps that protect your investment:
Startup procedures matter. The first few weeks after your pool is filled require careful attention to water chemistry. Your contractor should provide clear instructions on how to balance pH, alkalinity, and calcium hardness during this initial period.
Understand your warranty. Know what’s covered, for how long, and what maintenance is required to keep the warranty valid. Most issues that arise in the first year are covered, but only if you’ve followed the recommended care procedures.
Develop a maintenance routine. Weekly brushing, regular chemical testing, and prompt attention to any stains or surface changes will extend the life of your finish and keep your pool looking beautiful.
Plan for long-term care. Even the best-built pools require periodic maintenance. Understanding what to expect—and when—helps you budget and plan accordingly.
Building Your Dream Pool the Right Way
A custom gunite pool is more than a luxury purchase. It’s where memories get made, where family events happen, where new beginnings are celebrated.
That’s why the decisions you make during planning and construction matter so much.
Soil stability determines whether your pool lasts 50 years or develops problems in five. Proper curing ensures structural integrity that you’ll never see but will always benefit from. The right pebble finish balances beauty with durability. Clear communication with your contractor prevents misunderstandings and delays.
At Century Pools, we’ve been building custom gunite pools in California since 1964. We know what works because we’ve seen pools age over decades. We know what fails because we’ve been called in to fix problems that could have been prevented.
Our meticulous construction approach comes from understanding that backyard pools are treasured meeting places. We carefully inject personalized experience into every project because we’re building spaces that families will cherish for generations.
When you’re ready to start planning your custom pool project, the questions you ask and the contractor you choose will shape everything that follows.
Choose a builder who prioritizes what you can’t see as much as what you can. One who explains why certain steps matter and doesn’t rush through critical phases. One who views transparency about challenges as part of earning your trust.
Your dream pool is worth building right the first time.
Ready to start planning your custom gunite pool? Contact Century Pools to schedule a property evaluation and learn how we can bring your vision to life with the quality and craftsmanship that comes from 60 years of family expertise.
