How to Measure for Your Awning

1800Awnings.com · Customer Resource Center

The Complete Guide to Measuring for Your Awning

Accurate measurements are the single most important step to a perfect-fit awning. This illustrated guide walks you through measuring every product we sell — from motorized retractable awnings to welded-frame fabric & vinyl awnings, Bahama shades, standing-seam metal, canopies, screens and pergolas.

📐 Step-by-step diagrams🏷 Every product line covered✅ Submit with confidence

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1Before You Measure

A ten-minute setup saves costly re-orders. Gather the right tools, understand the three core dimensions, and always measure twice.

Tools you'll need

  • 25' steel tape measure (not cloth) for accuracy and reach.
  • Step ladder to reach the intended mounting height.
  • Level & pencil to mark a true horizontal mounting line.
  • Helper for spans over 8 feet so the tape stays level.
  • Phone/camera to photograph the wall, obstructions, and your marks.

Golden rules

  • Measure twice, order once.
  • Inches, not "about." Record to the nearest 1/8″.
  • List Width first, then Projection, then Drop/Height.
  • Note obstructions: gutters, downspouts, lights, soffits, doors, windows.
  • Confirm your mounting surface and what's behind it (wood, brick, stucco, siding).
Important: Unless a product page states otherwise, the size you order is the frame/projection size of the awning, not the size of the window or opening. For window & door awnings you typically add coverage beyond the opening. When in doubt, send your raw opening measurements and a photo — our team will spec the correct unit size for you.

2The Three Core Dimensions: Width × Projection × Drop

Almost every awning is described with three numbers. Learn these once and every product below becomes easy.

Width (W) — left-to-right across the front
Projection (P) — how far it extends out from the wall
Drop / Height (D) — the vertical face or front-bar height
W — WidthProjectionD

How to read a size like "12' × 10'"

On retractable awnings the first number is the Width (the wall span); the second is the Projection (how far it reaches out when open). So 12' × 10' = 12 feet wide, projecting 10 feet from the wall.

On window & entrance awnings you'll also give a Drop (D) — the height of the vertical front face.

Tip: Always write the wall-mounting Width first. If you flip Width and Projection, the awning won't fit.

3Retractable Awnings

SunflexxSunscapeHeliosApolloHerculesZeus Lateral-arm awnings mount to a wall, soffit, or roof and extend out over a patio or deck. You choose a Width (wall span) and a Projection (reach). The most common mistake is not leaving enough mounting height for proper pitch and clearance.

Sunflexx
Sunflexx
Zeus
Zeus
Helios
Helios
Apollo
Apollo
Hercules
Hercules
Width (wall span)Proj.Mounting height

Take these four measurements

  1. Width (wall span): the clear, unobstructed run of wall. Order a Width equal to or just under it.
  2. Projection: how far out you want shade. Confirm nothing blocks the arms.
  3. Mounting height: floor to mounting line. Higher is better; the awning pitches down as it projects.
  4. Front-edge clearance: the lowest point (front bar fully out) should leave ~7' headroom.
Projection Approx. drop Min. mounting height*
8' ~8″ 8' 0″
10' ~10″ 8' 4″
12' ~12″ 8' 8″
14' ~14″ 9' 0″

*Guideline only — final height depends on model, mount type and desired clearance.

Model notes: Sunflexx & Sunscape (Eastern Awning Systems) and Zeus / Helios / Apollo (Shademaker) come in fixed Width × Projection sizes — pick the size that fits your span and reach. Hercules is the heavy-duty wide-span model. Helios has an adjustable front bar.
Mounting surface: tell us wall, soffit/eave (under-mount), or roof mount — this changes the brackets, height and hardware we ship.
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4Welded-Frame Fabric & Vinyl Awnings

Fixed (stationary) awnings on a welded aluminum tube frame, covered in fabric (acrylic like Sunbrella) or vinyl/laminate. Made to your exact opening, so Width, Projection, Drop must be precise.

Step 1 — Measure the opening, then add coverage

Opening widthAwning width = opening + overhangDrop / Height
  1. Opening width: window/door frame at its widest (outside trim to outside trim).
  2. Add side overhang: ~3–6″ per side so the awning extends past the opening = your awning Width.
  3. Projection: for windows usually equals or slightly exceeds the drop; for doorways far enough to keep rain off the threshold (often 24–48″).
  4. Drop / Height: the vertical front face — shades the top 1/3 to 1/2 of a window; high enough to walk under at a door.
  5. Mounting height & headroom: note the mounting height and confirm clearance under the front bar.

Step 2 — Identify your frame style

TraditionalWaterfallDomeConcave

Style-specific notes

  • Traditional slope: give Width, Projection and Drop. The valance is part of the drop.
  • Waterfall / box: projection and drop are similar; a square storefront look.
  • Dome / quarter-round: drop and projection equal (the radius). Measure the opening width.
  • Concave / elongated: specify Width, the projection at the bottom, and overall drop.
Fabric vs. vinyl: tell us the cover — woven acrylic (classic), vinyl/laminated (wipeable, great for graphics), or flame-retardant for commercial.
Commercial / storefront: for lettering or a logo, also send the sign-band height and any sign-code clearance (often 8' min over a sidewalk), plus a photo with a tape across the opening.
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5Bahama & Shade Awnings

ShadeViewClearViewDecoViewFauxView Mount above a window at a fixed angle, like a louvered visor — shade and privacy with airflow. Sized to the window.

ShadeView
ShadeView
ClearView
ClearView
DecoView
DecoView
FauxView
FauxView
Width = window + 4″ each sideHeight (coverage)
  1. Window width: outside trim to outside trim, add ~4″ per side = awning Width.
  2. Window height & coverage: choose a Bahama height that covers the glass for the sun/privacy you want.
  3. Mounting above window: top hinge mounts a few inches above the head — confirm clear wall (no soffit interference).
  4. Projection / prop-out: note any obstruction in front; the bottom edge stands off the wall.
View options: ShadeView = solid; ClearView = open louvers; DecoView & FauxView = decorative. Measuring is identical — give the window size.
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6Standing-Seam Metal Awnings

S-Series — closed endsO-Series — open ends Rigid aluminum standing-seam awnings over windows, doors and entries. Measure like a fixed awning: Width, Projection, Drop.

S-Series
S-Series (closed)
O-Series
O-Series (open)
WidthProj.Drop
  1. Width: opening width plus side overhang (typically 3–6″).
  2. Projection: enough to shade the opening and shed rain past it.
  3. Drop: the vertical face height. S = closed ends, O = open ends — choose for looks; measuring is the same.
  4. Mounting + headroom: record mounting height and confirm walk-under clearance at doors.
S vs. O: closed ends (S) look more finished with a bit more side shade; open ends (O) look lighter and show the seam profile.
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7Canopy & Walkway Systems

T-Series open tubeC-ChannelCantileverG-Series 6/8/10/12″ Welded-frame architectural canopies for entries, walkways and storefronts. Some are wall-supported (cantilever); some carry posts to the ground.

T-Series
T-Series Open Tube
C-Channel
C-Channel
Cantilever
Cantilever
G-Series
G-Series
Width (along wall)Projection (out from wall)Clearance height
  1. Width: the run along the wall to cover.
  2. Projection: how far out from the wall the canopy reaches.
  3. Mounting height: where it attaches to the wall, from the ground.
  4. Clearance height (posted systems): finished height under the front beam — keep walkways code-compliant.
  5. Post locations & surface: where posts land (concrete, pavers, soil); give total walkway length for post spacing.
System guide: Cantilever = no front posts (shorter projections). T-Series & C-Channel = post-supported for larger spans. G-Series is sized by fascia depth (6/8/10/12″) — deeper fascia spans farther.
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8Retractable Screens (Titan & Exterior Screens)

5″ Titan ShademakerExterior Screens Motorized or manual screens that drop down to enclose a porch, patio or lanai for shade, bug control and wind protection. Measure the opening width and the drop height.

Titan screen
5″ Titan Retractable Screen
Opening width (track to track)Drop height
  1. Opening width: measure at the top, middle and bottom — record all three; we use the controlling dimension and account for track width.
  2. Drop height: from the housing at the top down to the floor/sill. Measure both ends.
  3. Housing & track mounting: note the surface for the top housing and the two side tracks — must be solid and plumb.
  4. Power (motorized): note the nearest power source for the motor.
Out-of-square openings: differences over ~1/2″ matter. Send all three width readings and both height readings.
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9Pergolas & Louvered Roofs

Free-standing or wall-attached structures covering a patio or deck. Measure the footprint (Width × Projection), the height, and confirm the post landing surface.

Width (post to post)Post height
  1. Coverage footprint: Width × Projection of the area to shade — sets the post-to-post dimensions.
  2. Height: desired clearance under the beams; check against ledger height and door swings.
  3. Attachment: free-standing vs. attached; if attached, note ledger wall height/material.
  4. Post bases: existing concrete, pavers, deck, or soil needing footings.
  5. Slope & drainage: which way water should run off.
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10Decorative Shutters

Board & BattenColonialArched Sized for proportion: each shutter should look like it could close and cover half the window.

Board and batten
Board & Batten
Colonial
Colonial
Arched
Arched
Shutter height = window heightWindow width / 2 = each shutter
  1. Window height: the shutter height matches the window height for a correct look.
  2. Window width: divide by 2 = ideal width of each shutter in the pair.
  3. Arched tops: also measure height to the spring line and to the top of the arch.
  4. Mounting space: confirm flat wall beside the window to land each shutter.
Style note: Board & Batten (single/double/triple slat, Z-bar, X, Arrow) and Colonial louvered measure the same way.
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11Submitting Your Measurements

Send us clear numbers and photos and we'll confirm the exact unit size before anything is built or ships.

Your measurement checklist

  • Width (to the nearest 1/8″)
  • Projection
  • Drop / Height (window & fixed awnings)
  • Mounting height from the ground
  • Mounting surface & material
  • Obstructions (gutters, downspouts, lights, doors)
  • Screens: three width & two height readings
  • Photos with a tape across the area

Common mistakes to avoid

  • Flipping Width and Projection — always Width first.
  • Measuring the window instead of the awning — add side overhang.
  • Forgetting clearance — a low retractable can finish below head height.
  • Assuming the opening is square — measure top, middle, bottom.
  • Ignoring what's behind the wall — brick vs. siding changes the brackets.

📝 Interactive Measurement Worksheet

Fill this in as you measure, then generate a clean summary to copy or email to our team.

Your measurement summary



Not 100% sure? We'll measure-check for free.

Email your numbers and a couple of photos and our specialists will confirm the right size, style and mounting before you order.

Send My Measurements
© 1800Awnings.com — Customer Resource Center. Questions about a measurement? Call us or email a photo with your numbers and we'll confirm your unit size before you order.