Semi-Inground Pools in New Hampshire

New England’s Pioneer in Rectangular On-Ground Pools

For more than 40 years and three generations, Gibraltar Pools has been the company homeowners turn to when they want a pool that looks built-in, installs without weeks of disruption, and is built for long-term use. We pioneered the rectangular on-ground swimming pool, and pools we built in the early days of Gibraltar Pools are still in regular use today. Our semi-inground pools deliver the polished, finished look of an inground pool without the excavation, the multi-week construction timeline, or the steep price premium that comes with it.

If you’re weighing pool options for your property, the first step costs you nothing. Our factory-trained design team visits your home, evaluates your site, takes precise measurements, and walks through every design option with you. No obligation, no pressure.

Ready to see what’s possible in your backyard? Call Gibraltar Pools at (978) 759-4445 to schedule your free backyard assessment. We serve Rockingham, Hillsborough, and Strafford counties, and beyond. 

Why Our Pools Outperform Traditional Inground Pools 

Traditional inground pool installation typically means excavation equipment in your yard, multi-week construction timelines, and permit coordination across multiple municipal departments. Most New Hampshire towns require building permits, site plans, and setback compliance before a single shovel breaks ground. Gibraltar Pools can guide clients through the local permitting process as part of the installation service, so that complexity doesn’t fall on you.

Where an inground build takes weeks and bundles nothing, a Gibraltar Pools installation is completed in most cases in a single day. Every pool includes the Alum-A-Clad™ decking system, walk-up staircase with railings, and our Gibraltar Safety View™ liner as standard components. There’s no separate wooden deck to budget for, no contractor to coordinate, and fewer add-on costs. Six U.S. Government patents back the Gibraltar Pool system, and no other on-ground pool manufacturer can replicate its engineered features. The system can be installed fully above ground or partially set into the ground, depending on yard grade and terrain, which matters on properties with rocky soil, sloped lots, or elevation changes near the Lakes Region and White Mountains.

The benefits of semi-in-ground pools include:

• More cost-effective than traditional inground pools
• Quick, minimally disruptive installation
• Adaptable designs for a variety of yard layouts
• Reduced maintenance over time

Built for New Hampshire’s Landscape & Climate

Local properties range from sloped and rocky terrain in the Lakes Region and White Mountains to flatter suburban lots in Nashua, Manchester, Concord, and Portsmouth. During your free backyard assessment, we evaluate grading, soil composition, drainage, and available space, then recommend the installation configuration that’s best suited to your specific site. Our crews are experienced with New England’s rocky soil conditions and work with the natural landscape during site preparation rather than against it.

Winter performance is engineered into the product, not an afterthought. Gibraltar's interlocking aluminum wall panels are designed for freeze-thaw cycles, heavy snowfall, and seasonal temperature shifts without drying out, becoming brittle, or cracking. Resin and plastic pool walls can fail in exactly those conditions. The dual filtration system adds another layer of long-term efficiency: it filters twice the water at twice the rate of ordinary pools and can cut electrical operation times in half, reducing ongoing operating costs through every season.

Premium Features Included With Every Gibraltar Pool™

Every Gibraltar Pools installation comes as a complete, bundled system. The features below are standard inclusions, not upgrades. They’re also backed by six U.S. Government patents, which means no other on-ground pool manufacturer can replicate this combination.

Gibraltar Safety View™ Liner

Our 22-mil winterized virgin vinyl liner is built with a patented custom liner-fit system that can extend liner life and improve underwater visibility for easier swimmer monitoring. It’s a safety feature not found on standard pool liners, and it holds up through New England winters without the brittleness common in lighter-gauge materials.

Interlocking Aluminum Wall Panels

Unlike resin or plastic walls that can become brittle under repeated freeze-thaw stress, our interlocking aluminum panels maintain their structural integrity year after year. They won’t dry out, won’t crack, and don’t require the seasonal patching that can shorten the life of other pool walls.

Dual Filtration System

Our filtration system processes twice the water volume at twice the rate of conventional pool filters. That efficiency can cut electrical operation times in half, reduce the need for daily vacuuming, and simplify water chemistry management across the full swimming season.

Alum-A-Clad™ Patio Decking System

Our proprietary aluminum decking wraps all four sides of the pool, eliminating the need for a separate wooden deck. It won’t rot, won’t require annual sealing, and won’t develop the mold issues common with carpeted or wood-surface decks. It’s a standard inclusion that no other on-ground pool brand bundles this way.

Walk-Up Staircase With Railings

Every Gibraltar Pool™ includes a wide walk-up staircase with two handrails and two support grips. It’s designed to be safer and more accessible than a standard outside ladder, particularly for children and older swimmers.

The Gibraltar Pool™ is also a recognized design award winner from both the National Spa and Pool Institute and the Association of Pool and Spa Professionals, and has been featured in Good Housekeeping magazine. It’s the only on-ground pool in New England to hold that combination of industry recognition.

What to Expect From Your Installation

• Free backyard assessment: A factory-trained design team visits your home, reviews your yard’s layout, discusses your goals, and covers budget, timeline, and any permitting requirements specific to your town.
• Design and planning: Pool size, placement, configuration, and features are finalized and tailored to your property. Nothing moves to installation until every detail is confirmed.
• Professional installation: Our experienced crew handles site preparation, interlocking aluminum wall assembly, Safety View liner installation, and plumbing. A dedicated project manager stays available throughout and keeps you informed at every step. Most installations are completed in a single day.
• Pool school: Once your pool is in, we walk you through operation, maintenance, and safety features so you can use it with confidence from day one. Ongoing support for openings and closings, pump and motor repairs, heater service, salt system maintenance, leak repair, and water chemistry is available for all makes and models of pool equipment.

More Than 7,000 Pools Built Across New England

Gibraltar Pools has installed more than 7,000 on-ground swimming pools throughout New England. Every one is backed by the strongest manufacturer’s warranties in the swimming pool industry, covering defective materials and workmanship. Our family-owned company has operated for more than 40 years across three generations, and the pools we built in the early years are still in use today. That’s not a marketing claim. It’s the track record that keeps customers part of the Gibraltar family long after installation day.

Homeowners are welcome to visit our showroom on Route One in Topsfield, MA, which houses the region’s largest display of semi-inground pools, spas, and saunas. Seeing the construction quality in person answers questions that photos can’t. Our office staff is also available by phone to answer questions on water chemistry, maintenance, and service without requiring an online appointment.

Schedule Your Free Backyard Assessment

Whether you’re in Manchester, Nashua, Concord, Portsmouth, the Lakes Region, or anywhere else in New Hampshire, Gibraltar Pools is ready to help you find the right pool for your property and your budget. We’re not here to close a transaction. We’re here to be your long-term pool partner. 

Call us at (978) 759-4445 to schedule your free, no-obligation backyard assessment and take the first step.