Build a three season room


The Three-Season Porch - This Old House

Until the porch was built, poolside umbrellas provided the only sanctuary from the midday sun.

Photo by William P. Steele

On the border that divides indoor and out sits the screened porch, architecture's easy­going response to the scorching sun, lightning storms, and biting bugs of late summer. Even one afternoon spent in this iconic place leaves you thinking about how to extend its pleasures beyond the sultry months.

A season-spanning porch was just what the owner of this Cape Cod-style cottage had in mind when she approached local building contractor Guy Clermont. She dreamed of creating a bright, airy room where she could relax on warm May evenings and entertain friends on chilly October afternoons. And as a creative director in the fashion industry, she had definite ideas about how she wanted the space to look: handsome mahogany flooring, whitewashed walls with traditional moldings, panel and pilaster details, and a vaulted beadboard ceiling with exposed beams.

She was also sure she'd never be able to bankroll it all at once. "I was convinced that to do it right, I'd have to build the room in stages over a few years. First the deck, then the peaked roof, then the screening. Then later, maybe add windows," she recalls. "Guy suggested a way to make the whole thing affordable at once."

The pro's advice: Go ahead and build the addition you want but, instead of installing curtain screens and windows, use stock wooden storm doors with interchangeable screen and window inserts as stationary porch panels. When temperatures cool, the panels' screens can be lifted out and swapped for divided-light inserts of tempered glass, stretching out the porch season along with the available living space.

"With a three-season room, you don't need to excavate a foundation, install heating or plumbing systems, or insulate the way you do with a year-round addition, so you start saving right there," says Clermont. Employing stock doors as porch panels cuts the budget one step further, eliminating the need for a lot of extra on-site carpentry and custom millwork. "Basically, you put in piers and girders, frame out the roofline, lay the deck, pop in the doors shiplap-style, and do the finish carpentry—which can be as simple or as intricate as you want," says Clermont. The idea is not original, the builder emphasizes, but it's one that makes a lot of sense. "Think about it: I could charge you to build custom-fitted porch screens on-site, or I could measure out the framework to accommodate standard-size wood doors and cut down my labor costs by about a third."

The kitchen's French doors once led straight to the sun-filled backyard. The three-season addition creates a more gradual transition from house to garden to pool, leaving the interior cooler but still bright.

Photo by William P. Steele

While many companies around the country make wooden screen doors and porch panels, Clermont typically uses sturdy Ponderosa pine doors handcrafted by CDC (Combination Door Company), a fourth-generation manufacturer in Fond du Lac, Wisconsin. The style he chose for this project in Bridgehampton, New York, even comes with a true-divided-light insert to match the French doors that lead into the kitchen. The inserts are held in place with factory­installed thumb­latches, "a beautiful thing," from this man's point of view, "since it means we don't have to screw a bunch of hardware into every panel, which can get pretty tedious." The easily operated mechanism (no tools required) also makes life easier for the homeowner when it's time to switch out the inserts or remove them for cleaning or repairs.

Situated off the home's large country kitchen and adjacent dining room, the addition measures 16 feet 6 inches by 19 feet 10 inches and uses a total of 14 doors: a dozen of them stationary, and two hinged and bolted to create a wide double entry. "Guy convinced me to make the room as big as possible, and to jut it straight out into the backyard to expose three long walls to the ocean breezes," says the owner. Ceiling fans, a smart option for porches with less airflow, are not necessary here, two miles from the Atlantic.

The resulting room is one of the most welcoming parts of the house and has made the whole place feel ­bigger. "This is where everyone wants to be now—it's the dining room, family room, and living room," the owner says. "Even in the dead of winter, when I look out through the kitchen's French doors, it feels like summer."

How to Create a 3-4 Season Sunroom

Dec 29th 2021

With colder temperatures already here and the holidays approaching, it’s time to start winterizing your porch enclosure and turn your screens into sunroom windows. Most homeowners choose to winterize their porch enclosure using winter porch panels and removing or covering their screens. This allows them to potentially create a three- to four-season sunroom — and enjoy their outdoor space all year — or, at least, more of the year.

Stick around to learn more about creating a sunroom and how we can help you create a space that will be comfortable and you will enjoy.

What is a Sunroom?

A sunroom is a room that was most likely created by installing windows or glass panels in a porch or patio enclosure. Technically speaking, a sunroom is a three-season porch; a four-season porch is called an all-season porch. However, for simplicity’s sake we will call them both sunrooms as that is how most people understand them.

What is a Three-Season Sunroom?

A three-season porch is usually enjoyed during the spring, summer, and fall depending on the climate and weather. This type of structure is usually enclosed with screen panels or glass panels. This type of enclosure usually doesn’t have a heat or cooling source. It may not have any electricity.

What is a Four-Season Sunroom?

An all-seasons porch is usually built as an extension of the indoor living space with insulation, a different type of framing (like that used in your home), heating and cooling, and electricity so it can be enjoyed no matter the temperature outside.

Both types of structures can add square footage to your home.

What Kind of Sunroom is Best?

Neither type of structure is objectively better than the other. Deciding which is best for you, depends on several factors:

A three-season porch can be created simply by replacing the screen panels of your screen enclosure with tempered glass panels: it is the most budget-friendly option. However, depending on your climate, you may not be able to use your porch during the winter and colder months of spring and fall.

Heating & Cooling Options: Making Your 3-Season Structure Comfortable

Having the same heating and cooling capabilities as your home will make your structure more comfortable. However, there are ways to help control the heat and cold in your porch enclosure without having to pay the four-season-sunroom price tag. Be sure to also consider the amounts of natural light that your sunroom will receive, as that can significantly impact the temperature of your porch enclosure.

*always consult building code and safety instructions for best results

How to Make a Sunroom

If you’re ready to construct your sunroom, we suggest getting started now as it’s the perfect time to winterize your porch enclosure. Also, our lead times for delivery are shorter! Here are some basic steps to take to start enclosing your porch. If you wish to turn your enclosure into a four-season room, you may want to do more research to make sure that your enclosure passes building code.

Step 1 - Decide On Your Enclosure Material

There are several material options for replacing screens: plexiglass, vinyl plastic, tempered glass panels, and combination window/screen systems. When choosing your material you should keep in mind:

Plexiglass sunroom windows, though inexpensive and easy to store when not in use, will yellow and bow overtime. A special cleaner is also needed.

Vinyl windows for sunrooms are also inexpensive and offer insulating benefits. They are a budget-friendly option, but keep in mind that they have to be replaced each year. You can learn more when you shop Winterview.

Tempered glass sunroom windows are one of the best options for 3-season porch windows. Tempered glass, also called safety glass, is stronger and safer than regular glass; if it does break, it crumbles into pebbles rather than breaking into shards. We offer stock size and custom size tempered glass winter porch panels that can be easily installed into the frame opening using casement clips. If you’re just creating your enclosure or need to replace a screen, we offer screen panels for a reduced additional cost. Shop our tempered glass panels.

If budget is the deciding factor, when you buy with us, consider using Affirm, a monthly financing option.

Step 2 - Install Transoms and/or Infrared Heat

Once you know how you’re going to enclose your porch, next you must consider installing options for heating and cooling. Transoms and a fan may help your porch be more enjoyable during the hotter months of the year, while installing infrared heat, electric heaters, or a space heater might help during colder temperatures. Make sure you follow all safety precautions when using a heater in your space.

Step 3 - Make It Your Own

Next, it’s time to add furniture, decorations, and other elements that will make the space truly your own. There are many options for how you choose to use your space:

And more! There are many ways to make your sunroom a space that you’ll love to spend time in. Visit the Metro Screenworks Pinterest to get more ideas!

Is it Worth It?

With any home improvement project it is always important to understand the cost and how it will affect your home’s value. A recent study showed that a porch is one of the one of the top five items that homebuyers want in a new home. What’s more, 65% of new homes have a porch. With more people working from home than ever, they are looking for more ways to effectively use their space during work hours and enjoy leisure after the work day.

Ready to Get Started?

We understand that there is a lot that goes into building a porch enclosure, and you might have a lot of questions about how to best navigate this project. We at Metro Screenworks are here to help! Contact us with questions about your project, how to measure, and any other concerns you may have. You can also visit our showroom in Highlands Ranch, Colorado to see our products in person. We love helping our customers make their home improvement projects a success. Visit our website today — we ship nationally!

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