Retractable Awning Size Guide: How to Measure Your Patio

There are really only two ways an awning lets you down, and you can head off both before you ever place the order. The first is buying too small: the shade falls a foot short of the table, and by four in the afternoon everyone's dragging their chairs across the patio to stay in it. The second is buying too wide, so the thing ends up crowding a downspout or hanging out past the corner of the house.

Both come down to measuring, and measuring an awning is simpler than most people expect. Ten minutes with a tape tells you everything you need. Let's walk through what to measure, why each number matters, and how to turn those numbers into the right size.

Width vs. Projection: What Each One Covers

Every awning is described by two numbers, and they trip people up constantly. Width is the measurement along your wall, left to right. Projection is how far the awning reaches out over the patio once it's fully open.

Think of it this way: width sets how many people you can seat in the shade, and projection sets how far back that shade reaches at midday. They aren't interchangeable. A 20-foot awning that only projects 7 feet throws a long, shallow band of shade, which is fine for a row of loungers tucked against the house. A 13-foot awning that reaches 10 feet out hands a smaller group a deeper, roomier pocket. Same idea, very different shape of shade, and the right one depends entirely on how you use the space.

Here's something the spec sheets tend to gloss over. The fabric is always a touch narrower than the frame it hangs on, usually by a few inches at each end, because the arms and end caps need somewhere to sit. So the number you take off your wall is the room the whole unit needs, not the width of shade you'll actually get. Give yourself a little breathing space on either side.

As for reach, most retractable awnings project between 7 and 12 feet. Hansø extends up to 10, which is plenty to cover a full dining set or a cluster of loungers, and it stops short of the point where a big span starts catching wind like a sail.

How to Measure Your Patio, Step by Step

You only need three numbers, and the whole thing takes about ten minutes. Before you head outside, grab a few things:

• A tape measure that reaches at least 25 feet.
• A sturdy ladder, so you can get up to the mounting height and measure it properly.
• A pencil and notepad, or your phone, to jot the numbers down as you go.

Once you've got those, work through the steps in order.

1. Measure your usable wall width. Run the tape along the wall where the awning will sit, corner to corner. Stop wherever something gets in the way that you can't work around: a downspout, a light fixture, a window you'd rather not half-cover. Whatever's left is the widest awning the wall can take, though it isn't necessarily the width you'll settle on.
2. Check your mounting height. Measure from the floor up to where the top bracket will land, under the eave, soffit, or fascia. You're after at least 7 feet 6 inches, so the front bar still clears people's heads once the awning tilts down. Go much lower and your taller guests will be ducking under the front edge all evening.
3. Decide how far out you want the shade. Go and stand where you actually sit. Measure from the wall to the far edge of the table or the loungers, then add a foot or two, because the sun keeps dropping through the afternoon and the shade has to travel with it. On most patios that works out to somewhere between 8 and 10 feet.
4. Note your mounting surface and power. Take a look at what you're fixing into, whether that's brick, siding, a fascia board, a soffit, or a separate roof frame. If the awning's motorized, clock where the nearest outlet is too. These are what determine the brackets and the install, and they're far easier to sort out now than after the box turns up.

Which Size Fits Your Patio?

So what size do you actually need? The rule of thumb is easy enough: go as wide as the wall space you measured, and deep enough to cover where people sit. In practice, balconies and small patios tend to land around 10 feet wide, a typical four-person patio around 13, a six-seater or a dining setup around 16, and a proper entertaining space up to 20. The chart below lines those up against the closest Hansø size.

Sizing a 10×12, 12×16, or 14×20 Patio

If you already know your patio's footprint, this gets even faster. Match the awning's width to whichever side runs along the house, then reach for 8 to 10 feet of projection to cover most of the depth.

• A 10 by 12 patio takes a 10 to 13 foot awning reaching about 8 to 10 feet out.
• A 12 by 16 patio is a comfortable match for a 16 foot awning at 10 feet of projection.
• A 14 by 20 patio wants a full 20 foot awning to run the length of the seating, again around 10 feet out.

One thing worth knowing: an awning shades the depth nearest the house best, and that's exactly where the table and chairs usually end up anyway. You're covering the part of the patio you live on, not trying to roof the whole yard.

Know your numbers? See the four Hansø awning sizes and current pricing.

Mounting Height, Pitch, and Clearance

Getting the size right is only half the job. Where and how you mount the awning settles the rest, from whether the shade shows up when you need it to whether rain sheds off cleanly or sits in a puddle on the fabric. Here's the short version, with the reasoning underneath.

Start with height. You want at least 7 feet 6 inches from the floor to the mounting point, so the front bar clears people's heads once the awning tilts down. If your wall doesn't give you that much room, moving the mount up onto the fascia or a roof frame usually buys the clearance back.

Then there's pitch. An awning should tilt down about 15 to 20 degrees so water runs off the front rather than pooling in the middle and stretching the fabric. That same slope is what fends off the low afternoon sun, which is exactly when you want shade most and a flat awning does least.

Orientation matters more than people expect. South and west-facing walls catch the most sun, so that's where an awning really earns its keep. It's worth spending a day watching how the sun crosses your patio before you commit to a spot, because a perfectly sized awning in the wrong place will still leave you squinting at six in the evening.

And one honest caveat: an awning is shade, not a storm roof. Hansø's holds up to 25 mph while it's out, and the optional solar wind sensor pulls it in on its own at 18, so a sudden gust won't catch it while you're inside or away from home. If you need something built to stay put through real weather, that's a different structure, and it's the one we'll get to next.

Do You Really Need a Custom Size?

Most of the awning business runs on custom orders and in-home sales calls, which is why nearly every guide you'll read nudges you toward a made-to-measure quote. If your patio is a standard rectangle, you almost certainly don't need one.

Custom sizing does earn its place in a handful of situations:

• Your mounting wall is angled, curved, or broken up by obstructions.
• You need to span more than about 20 feet in a single unit.
• Your mounting surface needs a bracket a standard kit doesn't include.

For a plain rectangular patio, though, a ready-made size wins on nearly every count:

• It ships in weeks, instead of leaving you waiting on fabrication.
• It costs less than an equivalent made-to-measure build.
• You can put it up yourself in about an hour, or hand it to a pro in more than 40 states.

Hansø's four sizes cover the range most patios fall into, so whichever way you go, nobody has to sit through a sales pitch at the kitchen table.

Awning or Pergola: Which Makes More Sense?

Still torn between an awning and a pergola? The deciding factor usually isn't size, it's what you want the space to do. A retractable awning is the lighter, cheaper way to throw shade over a wall you already have, and it rolls away to nothing when you'd rather have open sky. When shade is the whole job, it's hard to beat.

A louvered aluminum pergola is a bigger commitment that does more. The roof opens and closes on command, it shrugs off serious wind and snow, and it reads as a genuine room rather than something bolted on after the fact. It costs more, and it's a real build. If you want to see that side in the same detail, our pergola size guide lays out those dimensions the way this one does.

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