Nearly 40% of pool projects in Middle Tennessee encounter hidden costs and structural risks because of our region's limestone bedrock. If you're planning a backyard oasis in Mt. Juliet, Lebanon, Franklin, Brentwood, Hendersonville, Gallatin, or Nashville, you've likely felt anxious about heavy clay soil shifting or the complex permitting process in Davidson and surrounding counties.

This guide gives you the confidence to navigate the 2026 construction landscape — from mastering the $280 inspection fee to engineering for sloped or rocky lots.

Understanding Gunite: The Gold Standard for Tennessee Backyards

Shotcrete — also known as gunite — is the preferred method for high-end residential pools because of its incredible strength. It involves a high-pressure application of sand, cement, and water sprayed directly over a thick cage of steel rebar, creating a monolithic shell that is significantly more durable than vinyl or liner alternatives.

Unlike vinyl liners that can tear or fade, gunite offers limitless customization: integrated tanning ledges, beach entries, massive waterfalls, any shape or depth you desire. In the 2026 Nashville real estate market, a custom gunite pool acts as a major differentiator — real estate experts consistently note that these permanent structures provide a much higher return on investment than other pool types.

The Technical Difference: Gunite vs. Poured Concrete

While people often use the terms interchangeably, gunite and traditional poured concrete are quite different. Traditional concrete is a "wet-mix" poured from a truck, which can lead to inconsistencies in shell thickness. Gunite uses a "dry-mix" process where water meets the material at the nozzle, allowing the builder to adjust the mixture on the fly. The result is a shell with much higher PSI and density — the primary defense against Tennessee's constantly expanding and contracting clay soil.

Adapting to Middle Tennessee's Unique Terrain

If you live on a sloped lot in Brentwood or Franklin, gunite is often the only viable choice. It allows us to build structural retaining walls directly into the pool design, managing elevation changes seamlessly. Experienced builders also know how to integrate the pool with natural limestone outcroppings found on many local properties, creating a "backyard resort" aesthetic that feels like a natural extension of your home.

The Step-by-Step Gunite Pool Installation Process

Phase 1: Design and Layout

We stake out the exact perimeter in your backyard so you can see the scale of your vision before we move any dirt. This is also when we review your property plat, HOA requirements, and any setback or easement considerations.

Phase 2: Excavation

The messiest phase — and where Middle Tennessee's notorious clay and limestone come into play. We prioritize site protection using silt fences and plywood to safeguard your lawn from equipment damage. In areas like Mt. Juliet, excavation typically lasts about one week, but solid rock can change that timeline.

The Rock Clause: If we hit solid limestone, the "Rock Clause" in your contract covers the specialized hydraulic hammer equipment needed to break through. We believe in total transparency so there are no surprises during the dig — approximately 40% of Middle Tennessee pool projects encounter this situation.

Phase 3: Steel Rebar and Plumbing

We build a rigid skeleton of steel rebar and install the circulation system. The rebar grid is engineered to allow the pool to act as a single, rigid unit — especially critical near limestone outcroppings where one side of the hole may rest on solid rock and the other on softer soil.

Phase 4: The Gunite Shoot

The most dramatic step. In a single day, your pool takes its permanent shape as we spray the mixture at high velocity over the steel frame. We follow the technical protocols outlined in the American Concrete Institute (ACI) Guide to Shotcrete to ensure every project meets the highest industry standards.

Phase 5: The 28-Day Cure

Gunite must cure for 28 days before we can apply the final finish. During this time, the homeowner plays a vital role by watering the shell daily — this moisture is essential for the chemical hydration process that transforms the wet mixture into a rock-solid, high-strength shell. Tennessee's humidity and rainfall can actually help this process.

Phase 6: Finishing

We apply modern 2026 tile, coping, and plaster to give your pool its signature look. The 2026 design season is seeing a strong shift toward sun shelves for shallow lounging and deep, dark plaster finishes that create a mirror-like effect on the water.

Gunite vs. Fiberglass: Choosing the Right Build for TN Soil

Factor	Gunite	Fiberglass
Installation time	3–6 months	3–6 weeks
Design flexibility	Unlimited shapes, depths, features	Pre-manufactured shapes
Sloped/irregular lots	Ideal — custom engineering	Limited
Clay soil resistance	Superior — shell weight exceeds 100,000 lbs	Good flexibility, but can shift
25-year maintenance	Periodic replaster every 10–15 years	No replastering needed
Customization	Tanning ledges, waterfalls, infinity edges	Pre-designed features only

The massive weight of a gunite shell — often exceeding 100,000 pounds — provides a natural anchor against the hydraulic pressure of Middle Tennessee's water table. For homeowners dealing with irregular lot shapes, steep grades, or complex terrain, gunite is the superior engineering choice.

Climate Resilience: From TN Summers to Freezing Winters

Tennessee's rapid freeze-thaw cycles test the limits of any outdoor construction. Gunite handles these temperature swings beautifully because its thermal expansion rate is very low. Proper winterization of the plumbing is still essential, but the shell itself remains a rock-solid guardian of your investment through the coldest January nights and the hottest July afternoons.

Navigating the Logistics: Permits, Timelines, and 2026 Trends

Permitting in Murfreesboro and Davidson County

For projects within Murfreesboro city limits:

• $280 inspection fee at permit issuance
• $100 refundable deposit required upfront
• Notarized agreement regarding barriers and alarms
• Any pool deeper than 24 inches requires a building permit

Under Tennessee's Katie Beth's Law, your pool must have an alarm of at least 50 decibels that triggers when anything weighing 15 pounds or more enters the water. Tennessee residential codes also require:

• Safety fence at least 48 inches high
• Self-closing and self-latching gates

HOA Approvals

If you live in a community like Blackman Farm or Marymont Springs, we help you navigate the HOA approval process — providing professional renderings and site plans your architectural board needs to feel confident in the structural integrity and aesthetic of your project.

Strategic Timing for the 2026 Season

We recommend starting your gunite project in the fall or winter. This off-season approach allows us to complete the messiest excavation work before heavy spring rains arrive, ensuring your pool is cured, plastered, and ready for its first swim by Memorial Day. Planning ahead also avoids the spring rush and keeps your project on a steady, logical schedule.

Why Marlin Exteriors Is Your Trusted Partner for Gunite Construction

At Marlin Exteriors, Inc., we bring over 20 years of specialized local craftsmanship to every project. Our roots are firmly planted in Mt. Juliet, and we've spent decades serving families across the entire Middle Tennessee area — Mt. Juliet, Nashville, Franklin, Murfreesboro, Brentwood, Hendersonville, Gallatin, and Lebanon.

We maintain strict requirements for steel rebar spacing and ensure gunite thickness exceeds industry minimums to provide a shell that lasts a lifetime. We don't just build pools — we act as guardians of your home's equity, managing every administrative and technical complexity so you can focus on the excitement of your new backyard resort.

To make your first consultation as productive as possible, have these items ready:

• Property plat maps showing existing structures and easements
• Your specific HOA guidelines and approval requirements
• Inspiration photos or a list of must-have features (tanning ledges, waterfalls, infinity edge, etc.)

Ready to build your private oasis? Contact Marlin Exteriors, Inc. for your custom gunite pool quote today.