The Short Answer: What to Know First
A 35×79 storm door is a non-standard size. Standard exterior doors are 36 inches wide by 80 inches tall, so a 35×79 unit is built for older homes, custom builds, or masonry openings that deviate from modern framing. Because it is non-standard, you have two paths: order a custom-sized unit from a manufacturer, or buy an adjustable frame kit and trim it to fit. Most buyers in this situation go custom, and that is the right call for a clean, weather-tight installation.
Before you look at any specific product, measure the actual opening — not the old door. The 35×79 dimension refers to the door slab itself, not the rough opening. The frame adds roughly 2 inches to both width and height. If your rough opening is 37.5 inches by 81.5 inches, a 35×79 unit with frame will fit. If your opening differs, you need a custom frame. Get this wrong and nothing else matters.
Storm Door Types and Configurations
Storm doors serve two jobs: protect the primary entry door from weather, and provide ventilation when you want airflow without leaving the main door open. The configuration you choose determines how well it does each job.
Full-View Storm Doors
A full-view door is a single pane of glass with no horizontal rails dividing the panel. It offers the clearest sightline and the most light transmission. The glass is typically tempered or laminated, and in many cases it is low-E coated to reduce heat transfer. Full-view doors are the most common choice for front entries because they preserve the look of the main door behind them.
The trade-off: no built-in screen. If you want ventilation, you either swap the glass panel seasonally or install a separate retractable screen that pulls down from the top of the frame. Some manufacturers offer a full-view door with an integrated retractable screen, which is worth considering if you live in a climate where you actually open the door.
Self-Storing Storm Doors
Self-storing doors have upper and lower glass panels that slide up and down within the frame. In the summer, you raise the lower glass and lower the upper glass, exposing the screen that sits between them. In winter, you reverse the process. This design eliminates the need to store glass panels in the garage or basement.
Self-storing units are practical but visually busier. The divided panels obstruct the view of the main door, and the sliding mechanism adds moving parts that can wear out over time. For a rental property or a utility entrance, this is a reasonable choice. For a primary front entry, most buyers prefer the cleaner look of a full-view door.
Retractable Screen Storm Doors
A retractable screen door has a full glass panel with a screen that rolls down from the top of the door when you need it. When not in use, the screen disappears into a housing, leaving the view completely unobstructed. This is the best of both worlds for aesthetics and function.
The catch is cost and mechanism complexity. Retractable screens are more expensive than self-storing units, and the screen fabric can tear if pets or children push against it. The rolling mechanism also needs periodic cleaning to keep operating smoothly. For a homeowner who values the view and wants occasional ventilation, this is the premium option.
Frame Materials: Aluminum, Steel, and Vinyl
The frame material determines the door’s durability, maintenance requirements, and thermal performance. Each option has a clear set of trade-offs.
Aluminum Frames
Aluminum is the industry standard for storm doors. It is lightweight, corrosion-resistant, and can be finished with baked-on enamel in a wide range of colors. Extruded aluminum frames are strong enough to hold large glass panels without sagging, and the material does not warp or rot.
The downside is thermal conductivity. Bare aluminum transfers heat and cold readily, which is why most quality units use a thermal break — a plastic strip inserted between the interior and exterior aluminum sections. A thermally broken aluminum frame performs significantly better than a non-thermally broken one. When comparing products, ask specifically whether the frame has a thermal break. This is not a minor spec; it directly affects condensation on the interior surface during winter and heat gain in summer.
Steel Frames
Steel frames are heavier and stronger than aluminum, but they are less common in residential storm doors. Steel is prone to rust if the finish is scratched, especially in coastal environments. The weight also makes installation more demanding — a steel-framed door with glass can be difficult for one person to handle.
Where steel makes sense is in high-traffic commercial applications or in areas with extreme wind loads, where the added rigidity prevents flexing. For most residential buyers, aluminum with a thermal break is the better balance of strength, weight, and corrosion resistance.
Vinyl Frames
Vinyl frames are the budget option. They are inexpensive, never need painting, and do not corrode. However, vinyl expands and contracts significantly with temperature changes, which can cause the frame to bow or the glass to seal poorly over time. Vinyl also lacks the rigidity of aluminum, so large panels can flex in wind.
Vinyl frames are acceptable for a screened porch or a utility door in a mild climate. For a primary entry door exposed to full weather, aluminum is the more reliable choice. The price difference is usually not enough to justify the durability trade-off.
35×79 vs. 36×80: Understanding the Size Difference
The 36×80 is the standard residential exterior door size in North America. The 35×79 is a legacy size found in older homes, particularly those built before the 1950s, and in some masonry or stucco constructions where the rough opening was framed tighter.
The difference is not just 1 inch in width and 1 inch in height. A 35×79 unit is roughly 7 percent smaller in total area than a 36×80. That affects the rough opening you need and the frame dimensions. If you are replacing an existing storm door, measure the old door slab itself — not the frame — to confirm whether you have a true 35×79 or something close to it.
Here is the critical point: if your rough opening fits a 36×80 unit, buy the standard size. It will be cheaper, easier to source, and available from far more manufacturers. Only order a 35×79 if your opening actually requires it. Many homeowners assume they need a non-standard size when a standard unit with adjustable frame would fit fine.
If your opening is truly 35×79, you are in custom territory. Some manufacturers stock this size, but most produce it on demand. Lead times are typically longer, and prices are higher than standard sizes — expect a premium of 15 to 30 percent over an equivalent 36×80 unit.
Comparison Table: Storm Door Options at a Glance
| Feature | Full-View | Self-Storing | Retractable Screen |
|---|---|---|---|
| View of main door | Unobstructed | Divided by rails | Unobstructed |
| Ventilation | Requires screen swap or add-on | Built-in screen | Built-in retractable screen |
| Glass options | Low-E, tempered, laminated | Low-E, tempered | Low-E, tempered |
| Typical frame material | Aluminum with thermal break | Aluminum | Aluminum with thermal break |
| Maintenance | Low | Moderate (sliding tracks) | Moderate (screen mechanism) |
| Best for | Front entries, aesthetics | Rentals, utility doors | Homes needing ventilation and view |
| Relative cost | Medium | Low | High |
How to Measure for a Storm Door Frame
Accurate measurement is the difference between a clean installation and a drafty, leaking mess. Here is the correct procedure.
Measure the rough opening width at three points: top, middle, and bottom. Use the narrowest measurement. Then measure the height at both sides and the center, again using the smallest number. The rough opening is the framed opening in the wall, not the dimensions of your existing door.
For a 35×79 door slab, the frame adds approximately 2 inches in width and 2 inches in height. So your rough opening should be about 37 inches by 81 inches. If your measurements are within 1/4 inch of these figures, a standard 35×79 unit will work with shims. If the opening is larger, you will need a custom frame or filler strips. If it is smaller, the unit will not fit without modifying the rough opening.
One common mistake: measuring the existing storm door or the interior door slab and assuming that is the correct size. The interior door is often smaller than the rough opening. Always measure the opening itself.
Another mistake: ignoring squareness. Old homes often have openings that are out of square by 1/2 inch or more. If your diagonal measurements differ by more than 1/4 inch, plan to use shims and check whether the manufacturer’s frame allows for adjustment. Most quality frames have slotted mounting holes that accommodate minor misalignment, but severe out-of-square conditions require frame modification.
Selecting the Right Storm Door for Your Building Project
If you are a contractor, architect, or property manager sourcing doors for multiple units, the decision criteria differ from a single homeowner. You need consistency, reliable lead times, and predictable performance across many installations.
Start by standardizing on one frame material and one glass specification. Aluminum with a thermal break and low-E tempered glass is the sensible default for most projects. It performs well across climate zones, meets code requirements for impact resistance in most areas, and requires minimal maintenance.
For ventilation, decide whether your tenants or occupants actually need it. In multifamily buildings, self-storing doors are often preferred because they require no seasonal glass storage and are simple to operate. In single-family custom builds, full-view doors with retractable screens are more common because aesthetics matter more.
Cost planning should account for the non-standard size premium. If you are building new construction, consider whether you can frame the rough opening to accept a standard 36×80 door instead. The material savings on the door itself often exceed the cost of adjusting the framing. This is a conversation to have with the general contractor before the rough opening is framed, not after.
Additional Considerations: Frames, Side Panels, and Metal Options
Storm Door Panels and Replacement Glass
If you already have a storm door frame and the glass is cracked or the seal is failing, you do not necessarily need to replace the whole unit. Many manufacturers sell replacement panels that fit existing frames. The challenge is matching the exact dimensions and mounting style of your current frame. Measure the panel itself, not the opening, and note whether it is held in place with glazing beads, clips, or screws.
Replacement panels are a cost-effective option for rental properties or older homes where the existing frame is still structurally sound. A new low-E glass panel can improve the thermal performance of an old door significantly, often at a fraction of the cost of a full replacement.
Metal Frame Screen Doors
A metal frame screen door is exactly what it sounds like: a screen door with a metal frame, typically aluminum, rather than wood or vinyl. The benefit is durability. Metal frames do not rot, warp, or swell like wood, and they hold screen material tautly without sagging.
Metal frame screen doors are commonly used in commercial settings, on patios, and on service entrances where a full storm door is overkill. They are lighter than storm doors and generally cheaper. The trade-off is that they offer no insulation value — they are purely for ventilation and insect protection.
For a 35×79 opening, a metal frame screen door can be built to fit, but you will likely need a custom order. This is a practical option if you want airflow without the weight and expense of a full storm door.
Storm Door with Side Panels
Wider openings sometimes require a storm door with side panels. This configuration uses a standard-width door flanked by fixed glass panels on one or both sides. Side panels are non-operable and match the door’s frame material and finish.
This is a design solution for openings wider than 36 inches. Instead of building an oversized door (which is heavy and difficult to operate), you split the opening into a door plus sidelites. The sidelites are framed separately and installed adjacent to the door unit.
If you have a 35×79 door opening with extra width on one side, a side panel configuration is worth considering. The panels add natural light and maintain the visual proportion of the entry. They also cost less than a custom oversized door because they use standard door components.
Matching Storm Doors to Steel Entry Doors
A common question is whether a storm door can be installed over a steel entry door. The answer is yes, with one caveat: the storm door frame must be mounted to the surrounding wall or brick mold, not to the steel door itself. The steel door swings independently, and the storm door frame attaches to the exterior casing.
The interaction between a steel door and a storm door is mostly about clearance. A steel door with a thick thermal break or a high threshold may leave insufficient clearance for the storm door’s sweep. Check that the storm door’s bottom sweep clears the threshold when the main door opens. If there is a conflict, you may need a threshold extension or a storm door with an adjustable sweep.
How We Approach These Standards as a Manufacturer
The discussion above covers what buyers should look for when sourcing a 35×79 storm door. As a manufacturer, this is how we meet those requirements.
We produce custom-sized storm doors to match non-standard openings like 35×79, along with standard sizes and side panel configurations. Our aluminum frames are built with thermal breaks as a standard feature, not an upgrade, because we know the performance difference matters in real-world installations. For the glass, we offer tempered and laminated options with low-E coatings, and we can adjust the profile structure and fittings to align with local building codes in your target market.
Because we are a factory, we control the entire production process. That means we can accommodate custom dimensions without the markup you would see from a distributor or middleman. We also run pre-shipment inspections on air-tightness, water-tightness, and wind resistance, so you know the unit performs before it leaves our facility. For contractors and importers, we provide full customs documentation and can arrange both FCL and LCL shipping directly from our factory in China.
If you have a project that requires a specific size or configuration, send us your rough opening measurements and we will confirm what fits. We can also produce units under your private label if you are sourcing for resale.
Frequently Asked Questions
What is the actual size of a 35×79 storm door?
The 35×79 dimension refers to the door slab, not the overall unit with frame. With the frame installed, the unit measures approximately 37 inches wide by 81 inches tall. The rough opening should be about 37 inches by 81 inches to accommodate the frame with room for shims.
What is the difference between a 35×79 and a 36×80 storm door?
The difference is 1 inch in width and 1 inch in height. A 36×80 is the standard residential size and is mass-produced, making it cheaper and easier to source. A 35×79 is non-standard and typically requires a custom order, which costs more and has longer lead times. If your rough opening can accept a 36×80, choose the standard size.
Can I get a storm door with side panels?
Yes. Side panels are fixed glass units installed adjacent to the door. They are used when the opening is wider than a standard door width. The panels match the door’s frame material and finish and are a cost-effective alternative to a custom oversized door.
What are the benefits of a metal frame screen door?
Metal frames, usually aluminum, do not rot, warp, or swell like wood. They hold screen material tautly and last longer with minimal maintenance. They are lighter and cheaper than full storm doors, making them a good choice for porches and service entrances where insulation is not needed.
How do I measure for a storm door frame?
Measure the rough opening width at the top, middle, and bottom, and use the narrowest measurement. Measure the height at both sides and the center, and use the smallest. The rough opening is the framed opening in the wall, not the size of your existing door. For a 35×79 door, the rough opening should be about 37 inches by 81 inches.
What is the best storm door for a non-standard opening?
The best option is a custom-built aluminum storm door with a thermal break and low-E glass. A custom unit is manufactured to your exact rough opening dimensions, ensuring a proper fit and reliable weather sealing. Adjustable frame kits are cheaper but less precise and are only suitable when the opening is close to a standard size.
Are 35×79 storm doors energy efficient?
Energy efficiency depends on the frame’s thermal break and the glass specification, not the door’s size. A thermally broken aluminum frame with low-E glass provides good insulation. Look for a U-factor below 0.30 for cold climates, and check the SHGC rating if solar heat gain is a concern in your region.
Can I install a 35×79 storm door myself?
If you have basic carpentry skills and the opening is square, installation is manageable with two people. You will need a drill, shims, and exterior-grade caulk. If the opening is out of square, the framing is damaged, or you are working with a heavy steel-framed unit, hire a professional. Incorrect installation voids the weather seal and can lead to water damage.
