A practical, UK-focused guide to choosing insect screens for your windows and doors
— based on fit, durability, looks, and budget.
Custom flyscreens vs off-the-shelf insect screens is one of the most common questions we hear from homeowners looking to keep insects out while maintaining airflow.
There’s nothing worse than opening your windows on a warm evening only to spend the next hour chasing flies, mosquitoes, or wasps around the house. That’s where flyscreens (also called insect screens) come in. A well-fitted flyscreen allows you to keep windows and doors open for airflow without worrying about insects getting inside. But once you start shopping, you’ll quickly hit a fork in the road: do you buy custom (made-to-measure) flyscreens or pick up an off-the-shelf option from a DIY shop or online?
This post is designed to help you choose what’s right for your home — whether you want a quick seasonal fix or a longer-term upgrade for a frequently used door.
What do we mean by “custom” and “off-the-shelf”?
Custom flyscreens are built to your exact opening size (often to the millimetre). You typically choose the screen type (fixed, hinged, sliding, pleated, roller/retractable), frame colour, and sometimes mesh grade (standard insect mesh, finer mesh for smaller insects, tougher “pet-resistant” mesh, etc.). Made-to-measure screens are particularly common for doors and large openings where smooth operation matters day-to-day.
Off-the-shelf flyscreens are pre-made in standard sizes (or as DIY kits you cut down). Common examples include stick-on Velcro mesh, magnetic door curtains, adjustable frames, and trim-to-fit screen kits. They’re designed for convenience and low upfront cost, but they don’t always match real-world openings perfectly.
UK-home note: many domestic properties have uPVC casement windows and patio/French doors, and openings can vary slightly from room to room—even within the same house. That’s why a screen that “should fit” on paper can still end up with small gaps or rubbing in real life.
Custom vs. Off-the-Shelf: A Quick Comparison
Custom (Made-to-Measure)
✓ Precise sizing and improved sealing
✓ Ideal for large or unusual openings
✓ Designed for frequent use
✓ Integrated appearance with frame colour options
✓ Higher upfront cost
Off-the-Shelf / DIY
✓ Lower upfront cost
✓ Suitable for rentals and temporary solutions
✓ Standard sizes may require trimming
✓ More visible add-on appearance
✓ Components may wear sooner in high-use areas
1) Fit and insect protection: where the difference shows first
If your goal is simple — keep insects out — fit is everything. Many windows and door frames aren’t perfectly square, and small variances of just a few millimetres can create gaps, rubbing, or poor closing. Standard-size screens can work well when your opening happens to match, but “nearly” fitting is often the same as not fitting when it comes to bugs.
- Off-the-shelf: quicker to buy, but you may need trimming or improvised fixes—and gaps at the edges (especially top/bottom on door curtains) are a common complaint.
- Custom: sized to the opening for a snug finish, which helps screens sit neatly and improves insect sealing — particularly on high-use windows (for example, in kitchens and conservatories where you’re opening and closing them regularly).
2) Durability and daily wear: occasional use vs. “we open this door 50 times a day”
Think about how you’ll use the screen. A spare bedroom window that’s only cracked open at night is very different from a kitchen door to the garden in summer. Budget screens can be a great seasonal fix, but lighter frames, adhesives, and lower-grade mesh can stretch, sag, or tear sooner—especially in busy walk-through areas or windy openings.
Made-to-measure solutions are often built around sturdier frames and purpose-designed mechanisms (for example, pleated or roller/retractable screens) intended for repeated opening and closing. If you’re screening a main entrance to a patio or decking area, this “daily usability” is usually where custom options earn their keep.
3) Looks and integration: discreet upgrade or obvious add-on?
Flyscreens don’t have to look like an afterthought. With custom screens, you can usually match the frame colour to your uPVC, aluminium, or timber joinery and choose a style that suits the opening (hinged, sliding, pleated, retractable). Off-the-shelf solutions are often more visible: stick-on borders, bulky trims, or mesh that doesn’t sit perfectly flat.
4) Installation: DIY speed vs. “measure twice” accuracy
Off-the-shelf screens win on speed: buy today, fit today. But the more you need to cut, trim, or adapt a generic kit, the more the result depends on your measuring and DIY confidence. Made-to-measure screens still require accurate measurements, but they’re designed to arrive cut to your specifications, reducing the need for on-the-spot adjustments.
Quick measuring tip: for many openings, it’s good practice to measure width in three places (top/middle/bottom) and height in two or three places (left/centre/right), then use the smallest measurement. That helps account for frames that are slightly out of square.
5) Cost vs. value: what are you really paying for?
Off-the-shelf screens usually have the lowest upfront cost — ideal if you’re renting, need a temporary solution, or only want to screen one small window for a few months. Custom flyscreens cost more because you’re paying for precision sizing, stronger components, and often a cleaner finish. Over time, a better fit and longer service life can make custom screens the better value for high-use areas.
So, which should you choose? A simple decision checklist
Choose custom flyscreens if…
- Your windows/doors are non-standard sizes (even “slightly off” matters)
- You’re screening a main door you’ll use constantly in summer
- You want the screen to feel like part of the home, not a temporary fix
- You’d like options such as pleated or retractable systems for bigger openings
Choose off-the-shelf if…
- you’re renting or need a non-permanent solution
- it’s for a low-traffic window (guest room, utility, loft)
- your budget is tight and you can accept occasional gaps or shorter lifespan
- you need something fast for peak insect season
Don’t forget the screen type: fixed, hinged, sliding, pleated, retractable...
“Custom vs off-the-shelf” is only part of the choice. The style of screen matters just as much:
- Fixed screens: simple and cost-effective for windows you don’t need to access often.
- Hinged screens: a traditional “screen door” approach for standard doorways and windows.
- Sliding screens: designed to pair with sliding patio doors and commercial windows.
- Pleated screens: concertina/folding style that’s popular for wider openings and modern doors.
- Roller/retractable screens: roll away into a cassette when not in use for a discreet finish.
- Insect Panel Curtain: simple, cost effective, flexible, lower-commitment choice for wider openings.
- Chain Screen: suits frequent walk-through areas where you want hands-free access
Common pitfalls (and how to avoid them)
- Assuming your opening is perfectly square: always measure in multiple spots and use the smallest measurement. It’s much easier to account for a small gap than trying to force a screen that’s slightly too large into place.
- Ignoring handles and obstructions: casement stays, window handles, trickle vents, and door hardware can affect what type of screen will work.
- Buying a door solution that’s too “lightweight”: for busy doors, prioritise a design built for repeated use (often where made-to-measure options shine).
- Not thinking about who uses the door: kids and pets benefit from easy, reliable opening/closing — anything fiddly will be left open or damage.
Final Verdict
The “right” screen is the one you’ll actually use.
If you need a quick, affordable fix for one or two low-use openings, off-the-shelf flyscreens can be a sensible choice. But if you’re screening a main door (especially to the garden) or an awkward-sized window — and you want a neater finish, smoother day-to-day use, and fewer gaps — custom, made-to-measure flyscreens are often the better long-term option.
If you’re unsure which option would work best, we’re always happy to help recommend the right screen based on your opening, usage, and budget.
Next step: list the openings you want to screen (and how often you use each one), then note the type of door/window (casement, sash, patio slider, French doors, bifolds).
Window handles that stick out? Check out our Magnetic Insect Screen here.
Double doors that don’t match? Our Double Door Roller screen can help.
Live in a windy area? Look at our Wind Resistant Roller Screen.
Custom Flyscreens vs Off-the-Shelf: Frequently Asked Questions
Are custom flyscreens worth the extra cost?
Custom flyscreens are often worth the investment for frequently used windows and doors. Their precise fit can help reduce gaps, improve appearance and provide a more durable long-term solution than some DIY alternatives.
Do flyscreens keep out mosquitoes and other insects?
Yes. Standard insect mesh helps prevent flies, mosquitoes, wasps and many other flying insects from entering your home while still allowing airflow. For smaller insects such as midges, a finer mesh may be required.
Can I install a flyscreen myself?
Many flyscreens can be installed by competent DIYers. Simpler options such as magnetic screens and insect panel curtains are often straightforward to fit, while made-to-measure screens may require more accurate measuring and installation.
How do I measure for a flyscreen?
Measure the width at the top, middle and bottom of the opening, and the height on the left, centre and right. Use the smallest measurement when ordering to account for frames that may not be perfectly square.
What insects do flyscreens help protect against?
Flyscreens can help reduce the number of common household insects entering your home, including flies, mosquitoes, wasps, moths and other flying pests. For information about common UK pests, visit the British Pest Control Association (BPCA).
Do I need a flyscreen if I already use insect repellent?
Insect repellents and flyscreens serve different purposes. Repellents are designed to discourage insects from landing on people, while flyscreens help prevent insects from entering the home in the first place. For guidance on insect bites and prevention, see the NHS advice on insect bites and stings.
What type of flyscreen is best for patio doors?
The best option depends on the opening and how frequently it is used. Popular choices include sliding screens, pleated screens and double door roller screens, all of which can provide effective insect protection while maintaining easy access.
