There aren't any companies that do this nationwide since it's normally work performed by local contractors. Make sure to only hire a licensed contractor and call their references! Also - many saunas are designed to be installed by the customer.
Springs Sauna Company manufactures, ships, and installs saunas to the 50 United States. They specialize in custom sauna rooms, pre-fabricated sauna kits, and they also have sauna parts.
There are a number of places where one can find saunas for sale. One can purchase them from The Home Depot where there are many available to buy. They can also be bought from eBay and Saunas for Sale.
There is a sauna in almost every home in Finland. There are approximately 2.5 million saunas in Finland, according to http://www.divapor.com/ .
Wayfair.com is a site that sells home saunas. Greatsaunas.com might also be of some guidance to you! I believe that these two together can let you get a bit of a sense of the prices.
It really depends no where you live. Search google.com for "install home elevator" and include your city and state. Country Home Elevator & Stair lift installs in Missouri.
There are many local companies located across the nation that can install these systems. One national company that can install these systems is the comapny lowes. Which is a nation wide home remolding store.
blog.builtinvacuum.com/index.php/category/cvs-in-history/
The names of some of the companies in Calgary that sell and install roof windows are Lowes and Home Depot. They have stores in the USA and Calgary too.
The Clean Water Company install water purification systems for home use. They're known worldwide for their water filter, which they install into both homes and businesses throughout Ireland.
Garage Storage Cabinets makes the best cabinets that you can install easily at home without experience
Chairlifts are available through a limited number of companies. These companies will have someone who works with them to install the product. This ensures the company has an individual installing the chairlift who is knowledgeable and will not make mistakes that could be dangerous.
saunas make you so fat that you will explode.