Description
The Large Enclosed Gazebo for Oversized Hot Tubs and Compact Swim Spas
The Colorado 12×18 sits in a unique position in the Colorado collection — it is the size that bridges the gap between a dedicated hot tub enclosure and a full swim spa shelter. With interior dimensions of approximately 132 5/8″ x 203 7/8″, this large, enclosed gazebo provides enough floor space to house an oversized 8-person hot tub with a full lounge area, or a compact swim spa (up to approximately 14 feet in length) with clearance for entry, maintenance access, and a small seating area at one end.
Homeowners who find the 12×16 a bit tight for their intended setup but do not need the full 20-foot length of the 12×20 will find the Colorado 12×18 to be the ideal middle ground. The extra two feet of interior length compared to the 12×16 open up meaningful options: enough room for a sectional sofa alongside your hot tub, space for a small exercise area next to your swim spa, or the ability to add a TV, wet bar, or refreshment station without the room feeling cramped.
Ultrawood Construction: Premium Looks, Zero Maintenance
The Colorado 12×18 is built from Ultrawood composite — the same heavy-duty material used across the entire Colorado line. Ultrawood mimics the grain, texture, and color depth of natural wood while eliminating every maintenance requirement that comes with real timber construction. It does not rot, crack, fade, or attract insects. It never needs staining, sealing, painting, or sanding. For a structure this size, the maintenance savings alone add up to hundreds of dollars and dozens of hours over the lifetime of the gazebo.
The coastal gray wall panels paired with driftwood gray accents on the windows and doors create a modern, refined appearance that integrates naturally with virtually any home style or landscaping design. Several Colorado 12×18 owners have told us that the enclosure looks like it was built by a local contractor as a permanent room addition rather than delivered as a prefab structure — a testament to the quality of the Ultrawood finish and the attention to detail in the panel design.
Heavy-Duty Duraflex Roof for Northern Climates
The Duraflex PC roof on the Colorado 12×18 is rated to support up to 35 lbs. per square foot of snow load or up to 40 lbs. per square foot with the roof bracket upgrade kit. At this larger roof span, engineering becomes increasingly important — a wider and longer roof catches significantly more snow and rain than a smaller model. The Duraflex hardtop polycarbonate system is specifically designed to handle that load safely and consistently, making the Colorado 12×18 a smart choice for hot tub and swim spa owners in snow-heavy states like Minnesota, Michigan, Colorado, and the Pacific Northwest.
A centered skylight in the roof peak allows natural daylight to fill the interior, which is particularly important in a structure this size. Without adequate light, a large, enclosed space can feel dark and enclosed. The skylight solves that, creating a bright and welcoming atmosphere during the day and a view of the night sky for evening hot tub sessions. Six aluminum-framed sliding glass windows provide additional light, airflow, and temperature control. Every window locks securely for year-round all-weather protection.
Assembly, Access, and Practical Planning
The Colorado 12×18 ships as a pre-assembled panel kit. Wall sections, roof panels, windows, doors, and hardware all arrive ready for on-site assembly. At this size, plan for two to three people and a full day to complete the build comfortably. A power drill, tape measure, level, step ladder, and a pair of wood clamps are the essential tools. Westview’s detailed illustrated instruction manual and unlimited toll-free phone support (1- 800-895-1972) are included with every order.
Two lockable aluminum French doors can be placed on any side of the structure. This customizable door placement is especially valuable with a larger gazebo because it allows you to align the entrance with your existing walkway, deck, or patio access point. The lockable doors and windows provide full security and hot tub privacy when the space is not in use.
For homeowners in jurisdictions that require building permits for structures of this size, Westview offers an engineering stamp document that provides the resources you need for permit applications and HOA approvals. A properly prepared concrete pad or reinforced deck is recommended as the foundation if using the Colorado 12×18 for hot tub or swim spa use.
Upgrades and Financing
Customize your Colorado 12×18 with optional screen kits, tempered glass window upgrades, and reinforced roof bracket supports. Screen kits are perfect for three-season use in areas with heavy insect activity. Tempered glass improves thermal insulation, safety, and soundproofing. Roof brackets boost the structural rating for homeowners in extreme wind or snow regions. All upgrades can be bundled at a package discount. Affirm financing is available at checkout. Call 1-800-895-1972 to discuss sizing, upgrades, or delivery.
Thanks for all of your assistance in my purchase of my gazebo. It has been a pleasant experience and I have and will certainly continue to refer people to you.
I assembled the Gazebo by myself, had help lifting roof assemblies, and pretty much performed a one-man act. Advice: pre-thread your screws and bolts to ensure they will thread properly before you tighten them! Hardware strips easily if threads do not line up. Concrete screws will snap if the holes you pre-drill in the concrete are too tight; wiggle the drill bit to make a slightly larger opening. A hammer drill comes in handy for the concrete anchors. Most importantly, square up as much as possible or you may have issues with all the pre-drilled holes and roof panels lining up properly. Otherwise, finished product looks great!
Hi, My name is Noah and I live in Tampa Fl. Me and my friend Scott put our gazebo together with much ease. The instructions were very easy to follow. Some things didn’t make sense at first but after just following the directions STEP BY STEP it is a piece of cake. It took us about 6 hours start to finish, that’s with a break for Burger King. About 30 Min. The gazebo is very sturdy and the doors slide open and shut very easily. Talk about price, you can’t be beat. All parts are numbered and easily assembled. Just wanted to drop a note of praise to your company for your fast shipping and great do it yourself product. I have already recommended you to a friend of mine.
Enjoying our first winter with our enclosures. Spending New Year’s Eve outside in Pennsylvania!! Happy New Year!!
Love this gazebo. Looked long and hard at many brands and chose this one. No regrets. Assembly wasn’t too bad, a friend helped me. Looks great, very sturdy. Have had it up for a couple months. I highly recommend this if you’re looking for a gazebo. The company was great to deal with.
I LOVE IT. Everything from delivery to set up went flawlessly. I cannot recommend this whole experience more.
I put this together by mostly myself (with a little help from my wife for some items). Since I was mostly working alone, I did not pre-assemble the roof. I put together the frame with the rafters and lifted it into place. I also installed the ridge after one side was up and slide the panel for the other side underneath. The only problem I had was with some of the long bolts threading, but I called customer service and they sent replacement via FedX, no questions asked.
Absolutely love this gazebo. I made it by myself with only help with the roof. Customer service was and still is outstanding: any questions I had were answered very promptly. I’d highly recommend this gazebo to any and everyone. Let’s start a gazebo movement in the US.
We are loving our new 12×18 spa gazebo. It did take a very long time to receive it but I think it was worth the wait. It took us only about 10 hours total to put together and attach to our deck using lag bolts. Other than that, if you are in the market for something like this I think you will love it.
To Westview Manufacturing: “We really want to thank James, our salesman, and Andrew, our shipping representative. They were very friendly, courteous and did everything they could to make the purchasing and receiving of our gazebo a pleasure. We love the 12’X18’ Colorado gazebo. It was easy to put together by following the drawings and the color matches perfectly with my barn & shop trim. Our spa fits in the gazebo and leaves the room at the end for seats and a table. The thing we loved the most was the ability to switch panels, windows, and the door to fit our needs. That is a great concept that your company came up with. The gazebo looks great and fits our needs perfectly. We will now be able to use the spa no matter what the season is. We have sent several pictures of the gazebo to you so you can see the result. If anyone asks us about the gazebo, we will refer them to you. Thank you so much for a wonderful product and an amazing experience.”
Hey guys, I am sending you a whole set of pics inside and out of my gazebo. Your gazebo exceeded my expectations. The quality is very good. I created a homey space around my tub. What do you think of it? I have a table and sofa and patio lanterns…… My partner and I love it! If you need more photos let me know. You can use me as a referral anytime. Great website by the way. http://www.westviewmfg.com
Our Westview Gazebo far exceeded our expectations in regard to the quality of fit and finish and the attention to detail. The doors are made of heavy duty aluminum and tempered glass. The Ultrawood looks great similar to natural wood. Goes great with the Trex composite deck that we build last summer. We ordered our gazebo online and picked it up at the local terminal which was a snap as they loaded the crated gazebo onto our trailer in about 5 minutes. Installation took about 7 hours for the two of us. I want to give a shout out to James at Westview for his insightful tips. Thank you and I will recommend your products to our friends.
The Colorado spa gazebo is perfect except there is no floor included. I had to provide my own flooring. This is my only complaint about this building. Otherwise, we are happy with it.
Westview Manufacturing makes quality products. This Colorado 12×18 gazebo proves it.
Amazing value for the quality you get. Looks very high-end.
Our patio finally feels complete thanks to the Colorado 12×18 Gazebo.
The Colorado 12×18 provides a super comfortable space for entertaining or relaxing. Highly recommend.
The window and screen system is one of the best features—so flexible.
The wind-resistant design is legit. No rattling or shaking at all.
We paired it with outdoor furniture and it feels like a second living room.