Order your door before Friday 13th November for pre-Christmas delivery 🚚 🎄
If you are about to order a TWF roller garage door, download the Measuring Guide PDF and use the video below to guide you through each step, so you can measure with confidence.
Measuring is quick, but accuracy matters. The PDF is your full reference, and the video helps you follow along step by step.
For best results, keep the PDF open while you measure. Pause at each step, write your figures down in mm, then double check before you order.
Once you have your measurements, use the Garage Door Builder to select your options.
How to Measure a Garage Door Opening
To measure a garage door opening for a roller door, take the width at the top and bottom, the height from the finished floor to the underside of the lintel, the left and right side returns, and the clearance above the lintel for the top box. Measure in mm, from inside looking out, and use the smallest measurement if it varies.
| Measurement | What to measure | Notes |
|---|---|---|
| 1. Opening width (top) | Brick to brick at the top of the opening | Record in mm |
| 2. Opening width (bottom) | Brick to brick at floor line | Measure the tightest point |
| 3. Opening height | Finished floor to underside of lintel | If floor slopes, measure on the highest side |
| 4. Left return | Opening edge back to wall or obstruction | Inside looking out |
| 5. Right return | Opening edge back to wall or obstruction | Inside looking out |
| 6. Top clearance | Lintel area up to nearest obstruction above | Confirms top box position |
Record each measurement in millimetres (mm), from inside the garage looking out.
Step 1: Measure the opening width at the top (brick to brick)
Measure across the opening at the top, brickwork to brickwork.
Step 2: Measure the opening width at the bottom (brick to brick)
Measure across the opening at the floor line, brickwork to brickwork. If there is a threshold or uneven floor, measure at the tightest point.
Step 3: Measure the height from the floor to the underside of the lintel
Measure from the finished floor to the bottom of the lintel. If the floor slopes, take the measurement on the highest side.
Step 4: Measure the left pillar or side return width (inside)
Measure the clear return from the opening edge back to the inside wall or obstruction. Measure at the tightest point. Remember, left and right is from inside looking out.
Step 5: Measure the right pillar or side return width (inside)
Repeat on the right side. Measure the clear return from the opening edge back to the inside wall or obstruction. Measure at the tightest point.
Step 6: Measure top box clearance above the lintel (inside)
Measure from the top of the opening (lintel area) to the nearest obstruction above (ceiling, beams, pipes, etc). This confirms whether the top box can sit behind the lintel or needs to sit below it.
Tape measure (5m or longer), step ladder (if needed), pencil and paper (or notes app).
Measure to the brickwork, not trims. Check for thresholds and any obstructions near the opening.
Make a note of anything that could affect the fit, for example pipes, lights, sockets, and internal trims.
Make sure you are measuring from the finished floor level (do not measure to loose gravel) and double check your figures. A roller door cannot be made larger once manufactured.
Very pleased with my new garage door. Arrived 3 weeks from order, very straightforward to install and worked perfectly first time. I would highly recommend TWF.
Read more You never know how good a company is until things go wrong. I accidentally damaged the door while installing. I rang TWF and they understood my problem, supplied the new parts at cost and delivered next day. Found the service from TWF first class from initial order, delivery queries and finally after sales back up with express parts and advice on fitting.
Read more I spent ages looking at companies who supply roller garage doors and ended up choosing TWF and I’m glad I did. From start to finish they have been excellent to deal with, a family run firm who genuinely care about customer service and the products that they supply. Very helpful with scheduling delivery and when I had an installation question. You really don’t need to go anywhere else.
Read more Excellent company to deal with a run by the owners hands on Very impressive website too
Read more Following viewing a YouTube video of the diy guy fitting a TWF door, and having a quote for over £2000 to fit a new door, I decided to buy one from twf, great service, door was promised in 4 weeks but came in two. Studied the video and fitting instructions supplied. A mornings work with a mate and I’ve got a new door I’m very pleased with. At less than half the cost. Just need a new front door now 🤷🏻♂️
Read more Needed an urgent visit as garage door stuck and item inside was urgently needed and going away. Office went above and beyond to get engineer to me within an hour. Engineer was pleasant polite and efficient- repaired door within by replacing broken springs.
Read more Absoulte pleasure of a company to deal with. Nothing was a problem even for a amature questions from myself. Calls answered and messages responded to professionally and quickly even at weekends and evenings. The quality of the door supplied is amazing. Delivery was faster than quoted. I am one very happy customer. Hats off to the company the whole process has been fantastic.
Read more TWF supplied a custom roller garage door for self installation. I chose TWF after recommendation from “The DIY Guy” on YouTube and I was not disappointed. The entire service from initial quote to delivery was seamless, absolutely perfect. The installation was simple and the end result is exactly what I wanted. 100% recommend TWF for any garage door requirements you may have.
Read more Amazing company to deal with. The roller doors supplied are of a superior quality to one we had fitted by a competitor. They even upgraded that one for us. An issue was sorted within 30 minutes of calling them. Very highly recommended.
Read more Brilliant job from start to finish, we would highly recommend you to anyone. Thank you so much they look amazing.
Read moreShowing our 10 most recent Google reviews, newest first. No filtering by rating. Read all 93 on Google.
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