Start by looking at the front door while it is closed. Note where the gap is and how the door moves. A small removable fix may be all you need; there is no reason to start with a gadget.
Locate the problem
Check the letterbox, keyhole, bottom edge and the edges around the frame. The Energy Saving Trust's door guidance describes covers, flaps, brushes and sealing strips for these different places. Draught-proofing can help reduce heat loss; this guide makes no promise about a particular home's savings.
Measure the relevant opening and record the door material, opening direction and floor clearance. Photograph the area for your own reference. Do not use a flame to look for moving air.
Make a shortlist of fitting methods
| What you found | What to investigate | What to check before ordering |
|---|---|---|
| Gap beneath the door | A loose draught cushion or a suitable bottom-edge strip | Does it obstruct opening, closing or the escape route? |
| Gap around the frame | A correctly sized sealing strip | Will the door still close and latch normally? |
| Letterbox opening | A compatible flap or brush | Internal dimensions, existing fixings and door restrictions |
| Keyhole | A purpose-made cover | Lock operation and permission for any fixing |
Use the table to identify a fitting method, then check the product's dimensions and instructions.
Renters: separate removable from permanent
Renter-friendly (no drilling, removable): investigate loose products first, and check that the proposed arrangement will not obstruct the door. “Self-adhesive” does not itself tell you whether removal will leave a mark.
Needs landlord's permission: treat drilling, changes to fittings and changes to a shared or fire door as matters to resolve before purchase. Report a damaged or poorly fitting door rather than disguising the problem.
This is not legal advice. Tenancy rules differ across England, Scotland, Wales and Northern Ireland. Start with GOV.UK's private renting information, Citizens Advice or the relevant national service linked from Shelter.
Keep planned ventilation clear
The warning above is part of the fitting check. If you cannot distinguish an unwanted gap from a necessary ventilation route, stop and ask an appropriate professional. The Energy Saving Trust guidance also says internal doors should retain a gap beneath them for airflow; this front-door checklist is not a reason to seal every door in the home.