Door Clearance Checker
Enter your measured gaps — head, hinge & lock stiles and the bottom undercut in mm — pick the door's use, and get a pass / fail against fitting tolerances (≈3mm head & stiles, 6-12mm undercut, fire ≤3mm) with a fix for every gap.
Your measurements
Everyday bedroom / living door. ~3mm margins, 8-12mm undercut for return air. Recommended for this use: head 2-4mm, stiles 2-4mm, undercut 8-12mm. Measure with feeler gauges or a steel rule along the height — gaps should be even top-to-bottom.
Normal internal — clearance check
0 / 4 gaps pass
Within tolerance — good to hang. Undercut ≈ 10mm.
Gaps passing
4 / 4
Undercut
10 mm
bottom clearance
Head (top) gap: 3mm (target 2-4mm) OK
Hinge-side stile gap: 3mm (target 2-4mm) OK
Lock-side stile gap: 3mm (target 2-4mm) OK
Bottom undercut: 10mm (target 8-12mm) OK
Measured vs recommended gaps
Your measured gap (green = pass, red = out of tolerance) against the recommended mid-point (teal) for a normal internal door. All values in mm.
100% of gaps within tolerance. Bars side-by-side: left = recommended, right = your measurement.
Sort out a sticking or gappy door
DesignAI reads your gap measurements and door use, then talks you through the safest fix — planing, shimming hinges, adding a threshold or seal — without weakening the leaf.
How to read this check
Hung-leaf gaps should be small and even: about 3mm at the head and along both stiles, with a 6-12mm bottom undercut on internal doors (10-12mm where carpet or return-air ventilation needs it; less where a threshold or drop-seal is fitted). Fire doors (FD30/FD60) close everything down to ≤3mm and use an intumescent/smoke seal with no large undercut. Gaps that are too tight make the leaf bind and stick; gaps that are too wide let in light, draught and noise.
Where the door meets a threshold, keep accessible thresholds ≤12mm, bevelled if over 6mm, ideally flush (RPwD / NBC), and make sure escape doors keep free egress. A plumb, square frame is non-negotiable — most uneven gaps trace back to a frame that isn't true, not the leaf. In India, keep a DPC / anti-termite treatment at the frame base.
These margins are indicative for India 2026 — confirm with your carpenter or fitter on site, and measure twice. This is a guidance tool, not a substitute for a skilled carpenter or site engineer. (No costs are calculated here; where any door work is invoiced, remember 18% GST applies on materials and labour.)
Related Guides — Deep-dive reading
Door Clearances & Tolerances: The Gaps Guide (India 2026)
The exact margins around a hung leaf — 3mm reveals, 2-3mm latch gaps, 6-12mm undercut and tighter fire-door tolerances explained.
Home Doors & EntrancesDoor Gap & Reveal Inspection at QA: India 2026
How to inspect the margin around a hung leaf with feeler gauges, read an uneven reveal, and pass or fail a door on its gaps.
Home Doors & EntrancesDoor Installation Checklist: Inspect & Sign Off (India 2026)
A homeowner's before-during-after QC checklist for door fitting — square openings, holdfasts, even 3mm gaps, free swing, sealing and what to reject.
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