Walk into any home center and you will find a wall of storm doors sized for an 80 inch tall opening, and almost nothing else. That works for most newer homes, but older houses, custom builds and many front entries with transoms simply do not match. Custom storm doors fill that gap, along with a couple of cheaper workarounds that can make a stock door fit an opening a few inches off standard.
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Here is the quick answer. If your opening is within about 1 to 2 inches of a standard size, an extender kit or a door with built-in adjustable expander usually solves it. If the opening is 84 or 96 inches tall, unusually narrow, or far out of square, you will get a better result from a made-to-order door or from reframing the opening to a standard size. The right choice depends on how far off the opening is, your budget, and how much you are willing to change the trim around the entry.
Measuring correctly is the first step, so it gets attention before the options.
When You Need Custom Storm Doors
Standard storm doors come in widths of 30, 32 and 36 inches, sized for an 80 or 81 inch tall opening. The most common nonstandard situations are these.
- Tall openings. A 36×84 storm door fits entries in many older and higher-end homes built with 7 foot doors. A 36×96 storm door covers 8 foot entries, which have become popular in new construction with 9 or 10 foot ceilings.
- Slightly tall openings. A 36×81 storm door is often the same product as a 36×80 door, since most stock doors include an expander that covers roughly 80 to 81 inches. Openings of 81 1/2 or 82 inches start to push past that range.
- Narrow openings. Side entries, mudroom doors and older back doors may run 28 inches or less.
- Out-of-square openings. Settled houses often have openings that differ by more than 1/4 inch from one side to the other, which stock frames struggle to close up.
Custom storm doors also make sense when the goal is appearance: a full-view glass door with a specific color, a matching transom, or a style that complements an arched or decorative entry.
How to Measure a Storm Door Opening
Storm doors mount to the brick molding or exterior trim around the main door, so you measure the opening between the trim, not the door slab itself.
- Width. Measure between the inside edges of the side trim at the top, middle and bottom. Record the smallest number.
- Height. Measure from the top of the threshold to the underside of the head trim on the left and right sides. Record the smallest number.
- Square. Measure both diagonals, corner to corner. If they differ by more than about 1/4 inch, the opening is out of square, and that affects how the frame and expander seal.
- Mounting surface. Check that the trim is flat, solid and at least about 1 inch wide on the hinge side so the frame has something to fasten into.
- Handle clearance. Make sure the main door’s lever or knob will not hit the storm door’s glass or closer when both are shut.
Write down whether you want the hinges on the left or right as you stand outside. Getting this wrong is one of the most common ordering mistakes, and custom doors are rarely returnable.
Option 1: Order a Made-to-Size Door
Most storm door manufacturers offer a custom program through dealers and home center special-order desks. You supply the width, height and hinge side, and the door is built to fit, typically within 1/8 inch. Lead times often run 2 to 6 weeks.
This is the cleanest solution for a true 36×96 storm door or any opening more than a couple of inches off standard. The door frame, glass panels and screens are all proportioned for the opening, so the hardware lines up and the expander has its full adjustment range left for minor variation. Custom orders also open up more choices in color, glass type and hardware finish than a store shelf offers.
The downside is cost and commitment. A made-to-order storm door often costs 1.5 to 3 times what a stock door does. Once it ships, you own it, so double-check every measurement before you sign.
Option 2: Use an Extender or Expander Kit
Many stock doors include a Z-bar or drip-cap expander at the top or bottom that adjusts about 1 inch. Some brands sell separate extender kits that add another 1 to 3 inches of height. For an opening that runs 81 to 83 inches tall, a stock door plus an extender is often the most economical fix.
Extenders have limits. Beyond roughly 2 to 3 inches, the added strip looks noticeably bulky, and the door’s handle and closer sit lower than expected relative to the main door. An extender also cannot fix width. If your opening is 37 1/2 inches wide, an extender will not help.
Before buying, read the door’s stated size range on the box or spec sheet. Many listings now describe a range such as 32 to 33 inches wide by 80 to 81 inches tall, which tells you exactly how much adjustment you get.
Option 3: Reframe the Opening
Sometimes the smartest move is changing the opening to fit a standard door. For a tall entry, you can add a header strip of exterior-grade trim inside the top of the opening to bring an 84 inch height down to 80 or 81. For a wide opening, build out the side trim with a filler board. Done well, this looks deliberate, especially if you paint the new trim to match.
Reframing works best when the entry is not a showpiece and the size difference is modest, roughly 1 to 4 inches. It does change the proportions of the doorway, and on a 96 inch opening, closing it down 16 inches usually looks awkward. In that case, ordering a door sized for the opening is the better path.
Quick comparison
| Approach | Best for | Relative cost |
|---|---|---|
| Stock door with built-in expander | Up to about 1 inch off | Lowest |
| Stock door plus extender kit | 1 to 3 inches tall | Low |
| Reframe opening | 1 to 4 inches, plain entries | Low to moderate |
| Made-to-order door | 84 or 96 inch, narrow, out of square | Highest |
Safe Handling and Installation Basics
Storm doors carry large glass panels, and tall custom doors carry even bigger ones. Handle glass with care from the moment the box arrives.
- Wear cut-resistant gloves and safety glasses whenever you handle glass panels or the assembled door.
- Confirm the door uses tempered or safety glass. Tempered glass breaks into small granules instead of sharp shards, which matters on a door that gets pushed and slammed.
- Use two people to carry and lift the door, especially full-view models and anything taller than 84 inches.
- Carry glass panels vertically, never flat, and never flex them or strike the edges. Edge chips are the most common cause of later breakage.
- Keep panels in their packaging until you need them, and lean them against a padded surface, not bare concrete.
The installation sequence for a custom door is similar to a standard one. Dry-fit the hinge-side frame (often called the Z-bar) against the trim, check plumb, and fasten it. Hang the door on that rail, install the latch-side and top frame pieces, then adjust the expander to close the gap along the threshold. Finish by mounting the closer, the latch hardware and the wind chain if included. On tall doors, two closers, one at the top and one at the bottom, keep the door from twisting as it shuts.
Troubleshooting Fit Problems
If the door rubs on the latch side, the hinge rail is likely out of plumb; loosen the screws, shim behind the rail and refasten. A gap at the bottom that the sweep cannot close usually means the expander was set before the door was fully hung. Readjust it with the door closed. Drafts at the top often trace back to a head trim that is not level; a strip of foam weatherstripping behind the drip cap fixes small gaps.
A door that slams shut means the closer tension is too high or the wind chain is missing. Turn the closer’s adjustment screw a little at a time. If the latch will not catch, the strike may sit too high or low after expander changes, so reposition it.
Costs and When to Call a Pro
Stock storm doors usually range from about $150 to $500. Custom storm doors more often run $500 to $1,500 or more, with full-view glass, premium finishes and tall 96 inch sizes at the top of that range. Extender kits typically cost $20 to $60. Professional installation generally adds $150 to $400, more for reframing or trim work.
Consider hiring a pro when the opening is badly out of square, when the trim is rotted and needs replacement, or when the door is a heavy full-view model taller than 84 inches. A dealer who measures and installs also takes responsibility for the measurement, which protects you if a custom door arrives the wrong size. Whichever route you choose, a storm door that fits the opening properly seals better, lasts longer and protects the main door from weather for years.
Frequently Asked Questions
Can I buy a 36×84 storm door off the shelf?
Some retailers stock a few 84 inch tall models, but selection is limited. Most homeowners special-order them or use a door with an extended expander range.
Will a 36×80 storm door fit a 36×81 opening?
Usually yes. Most stock doors include an expander that adjusts about 1 inch, covering openings from roughly 80 to 81 inches tall. Check the size range on the spec sheet.
How long do custom storm doors take to arrive?
Lead times typically run 2 to 6 weeks, depending on the manufacturer, the season and options such as color or glass type.
Is it cheaper to reframe the opening or buy a custom door?
For small differences of a few inches, reframing with trim is usually cheaper. For tall 96 inch entries or large differences, a custom door looks better and avoids awkward proportions.
Do tall storm doors need two closers?
Most doors taller than 84 inches or with full-view glass benefit from two closers. They control the door evenly and reduce twisting that can stress the frame and glass.
