We seal door gaps across Bengaluru. Look at any door against a lit room and the gaps show themselves: the bright strip underneath, the leak lines along the sides, the glow over the top. Every one of them passes dust, insects, smells, sound and conditioned air all day. Door gaps are the easiest sealing win in a home, because the hardware is purpose-made: drop seals, sweeps, brush strips and thresholds, sized and fitted in a single short visit. Sealing one door completely starts at ₹1,200.
The gap under the door, and what actually walks through it
The floor gap is the big one, often ten millimetres or more, left for clearance over uneven floors. Under a main door it admits the corridor's dust and every crawling insect that patrols the skirting at night. Cockroaches flatten through gaps most people would not believe.
Under a bedroom door it is the AC's drain: cooled air is heavier than warm air and flows out along the floor, straight under the door, while warm air returns above. The bright gap under the door is literally where the electricity bill leaks.
Under a bathroom door, the story reverses: it lets smells and damp air into the bedroom.
One strip of the right hardware ends all of it, without making the door drag.
Sweeps, drop seals and brushes, choosing right
A door sweep is the simple answer: a rubber or silicone blade in an aluminium carrier, screwed to the door's bottom face, wiping the floor as the door swings. On a level floor it seals excellently and costs least.
A drop seal is the refined one: a mechanism inside a bottom channel that lowers a seal onto the floor only when the door closes, and lifts it clear for the swing. Nothing drags, floors stay unscratched, and uneven floors are accommodated. It is the right choice over polished stone and for heavy daily-use doors.
Brush strips suit sliding doors and uneven textured floors, where a blade would chatter.
And where the floor gap is simply too tall for any seal, a low aluminium threshold bridges it, with the seal meeting the threshold instead of the floor.
Sides and top, finishing the frame
Sealing only the bottom of a door is half the job. The sides and head of the leaf meet the frame with their own gaps, and sound and air treat every gap equally.
The frame line takes compression strips: slim silicone or EPDM profiles seated along the stop the door closes against, so the shut door presses gently into soft seal all the way round. The improvement in sound alone surprises people, because a door leaf is decent soundproofing and its perimeter gaps were the bypass.
On double doors, the meeting line between the leaves gets its own astragal strip.
The finish test is the darkened-room check: door closed, lights on the other side, and no light line visible anywhere around it.
Cost and the doors worth doing
Sealing one door, bottom plus perimeter, starts at ₹1,200. A drop seal, where chosen, is priced as its part above the base. A threshold, where the floor demands one, likewise.
The doors worth doing name themselves. The main door, against dust, insects and corridor noise. AC bedroom doors, against the nightly cold-air drain. A study or work-from-home door, against household sound. A bathroom door, holding damp air in its own room.
Most homes book two or three doors in one visit, and the per-door figure benefits. The bright line under a door is the cheapest problem in the flat to see and one of the cheapest to end.
