How to Install OTIF Steel Doors
Samuel MorrisHow to Install OTIF Steel Doors | Your Complete Step-by-Step Guide to a Perfect Fit!
Steel doors are known for their strength, style, and precision — but to truly get the most out of your OTIF bespoke steel door, proper installation is key. Whether you’re a professional installer or a homeowner working with a builder, this guide covers everything you need to know about installing OTIF steel doors safely, accurately, and efficiently.
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Why Installation Matters with Bespoke Steel Doors
Bespoke steel doors are precision-engineered to your exact measurements. Unlike timber doors, they don’t allow for trimming or on-site adjustments. This means perfect preparation is essential. A flawless installation not only ensures your doors operate smoothly, but also enhances soundproofing, insulation, and overall design impact.
Tools & Materials Required
- Spirit level (preferably digital)
- Heavy-duty drill and fixings (concrete/masonry or timber fixings as required)
- Rubber mallet
- Packers/shims
- Allen keys (for handle/lock fitting)
- Sealant and/or expanding foam (if needed for wall gaps)
- Assistant/helper for safe handling
Step 1: Prepare the Opening
Before your OTIF steel door even arrives, check the wall opening:
- Clear the aperture of debris, plaster lips, or uneven surfaces.
- Confirm the opening size matches your order spec within a tolerance of ±3mm.
- Ensure the opening is square, level, and plumb using a spirit level and laser if possible.
🔧 Pro Tip: The most common issue during install is an out-of-level floor or skewed reveal. Fix these before delivery to avoid problems.
Step 2: Unpack and Inspect the Door
When your OTIF steel door arrives:
- Open the packaging carefully.
- Inspect the frame, glass, hinges, and accessories for any damage during transit.
- Do not install if there’s visible damage — contact OTIF immediately.
Step 3: Dry Fit the Frame
Position the frame in the opening without fixings:
- Use packers to keep the frame perfectly centred.
- Check alignment on all axes — height, width, and squareness.
- Confirm that the hinge side is vertical, which is critical for door swing.
Step 4: Fix the Frame
Once aligned:
- Drill through the pre-punched fixing holes in the frame.
- Use appropriate plugs and screws based on the wall type (brick/block/timber/stud).
- Tighten fixings while checking level with each screw.
- Use packers behind screws to maintain frame shape.
⚠️ Avoid over-tightening — this can warp the frame and affect the door swing.
Step 5: Hang the Door Leaf
Now that the frame is secured:
- Lift the door leaf carefully into place.
- Align the hinges and gently slot the pins/bolts into place.
- Adjust hinge tension if needed for a smooth, even swing.
- Open and close the door to check for no rubbing, scraping or resistance.
Step 6: Fit the Handle & Lock
Install the handle, latch, and locking system:
- OTIF doors use European-style handles with spindle or thumbturn systems.
- Use the supplied Allen keys and fixings.
- Check for smooth latch operation and correct door pull tension.
Step 7: Finishing Touches
Seal any visible gaps:
- Use colour-matched silicone or mastic between frame and wall.
- Use expanding foam or insulation where necessary behind the frame (internally only).
- Fit any optional trim profiles or architraves as specified.
Aftercare and Maintenance
OTIF steel doors require minimal maintenance but benefit from:
- Regular wiping with a non-abrasive cloth and warm water.
- Avoid harsh chemicals on the powder-coated finish.
- Lubricate hinges and locks every 6–12 months for longevity.
Common Installation FAQs
Can I install OTIF steel doors myself?
We recommend professional installation due to the precision and weight of steel doors. However, experienced DIYers may manage with two people and care.
Do I need specialist tools?
No, just standard power tools and care with levelling. OTIF doors arrive fully assembled, reducing complexity.
What if my walls are uneven?
Packers and expanding foam can help with minor irregularities. Major structural issues should be corrected in advance.
Why Professional Installers Choose OTIF
OTIF steel doors are designed for simplicity and precision. Every door is:
- Pre-assembled and pre-hung
- Delivered with clear fixing points
- Custom-engineered to minimise on-site adjustments
This reduces install time, improves accuracy, and elevates the end result for your customer.
See OTIF Steel Doors in Action
Need inspiration? Explore our project portfolio to see our doors installed in real homes and commercial spaces across the UK. From modern pivots to classic single hinges, you’ll find examples of every installation scenario.
Final Thoughts
Steel doors are more than a structural upgrade — they’re an architectural feature. By installing your OTIF steel doors correctly, you unlock their full performance, durability, and aesthetic potential. Whether you’re a homeowner, contractor or interior designer, the installation is the step where quality comes to life.
Need help with installation or site measuring?
Contact our team today — we’ll guide you or connect you with a trusted local fitter.