Who this guide is for
- Homeowners replacing or adding an exterior door
- People concerned about draughts, leaks or security
- Anyone matching a new door to an existing opening
- Owners comparing door installers
Judge weather sealing and draught control
A well-fitted door keeps out wind and water around the whole perimeter and threshold. Ask how they seal the door and frame and handle the threshold, and look at how their past installs perform.
Draughty, leaky doors usually trace back to poor sealing at install.
- Ask how the door and frame are sealed
- Discuss threshold weatherproofing
- Look at how past installs perform
- Confirm draught control around the perimeter
Check security detailing
Security depends on the frame fixing, the locking points and how the door sits in the opening. Ask how they secure the frame and what locking arrangement they recommend for an exterior door.
A strong door in a poorly fixed frame is not secure.
Confirm threshold and frame fit
The frame must fit the opening squarely, with the threshold level and weathertight. Ask how they handle out-of-square openings and ensure the door operates smoothly over time.
Poor frame fit causes sticking, draughts and security gaps.
- Ask how out-of-square openings are handled
- Confirm the threshold is level and weathertight
- Check the door operates smoothly
- Discuss how the frame is fixed
Match the door to the opening and home
Confirm the installer works with the door material and style you want and can match it to the opening and the look of the house. Discuss how the finish is protected and maintained.
Material choice affects security, weathering and upkeep.
Brief and compare on the same scope
Give each installer the same information about the opening and the door you want, so quotes compare. Ask what could change once the old door and frame come out.
Confirm insurance and relevant experience.
- Share the same opening details with each
- Compare on like-for-like scope
- Ask what could change once the old door is out
- Confirm insurance and relevant experience
Hiring checklist
- 1Choose your door material and style
- 2Ask how the door and frame are sealed
- 3Discuss threshold weatherproofing
- 4Ask how the frame is secured
- 5Confirm the recommended locking arrangement
- 6Ask how out-of-square openings are handled
- 7Confirm the threshold is level and weathertight
- 8Match the door to the opening and home
- 9Give each installer the same brief
- 10Confirm insurance and relevant experience
Common mistakes to avoid
- Judging the door by looks while ignoring sealing and fit
- Overlooking security at the frame and locking points
- Assuming an out-of-square opening is no problem
- Choosing a material the installer rarely fits
- Comparing quotes for different scopes
- Skipping insurance and experience checks
When to involve a professional
- Keep structural changes to openings with qualified professionals
- Confirm the installer secures the frame for real security
- Ask to see comparable door installations before hiring
- Ask to see relevant insurance for the work
- Remember door and envelope requirements vary by location and project
Frequently asked questions
Questions readers ask about this topic
Why does installation matter as much as the door?
An exterior door provides security, weather sealing and insulation, and a poor install undermines all of them. How the installer seals, secures and fits the door and frame matters as much as the door itself.
How do I judge weather sealing?
Ask how they seal the door and frame and handle the threshold, and look at how past installs perform against wind and water. Draughty, leaky doors usually trace back to poor sealing at installation.
What makes a door secure?
Security depends on the frame fixing, the locking points and how the door sits in the opening, not just the door's strength. Ask how they secure the frame and what locking arrangement they recommend.
What if my opening is not square?
Older openings are often out of square, and a good installer accounts for that so the door operates smoothly and seals well. Ask how they handle it, and keep any structural opening changes with qualified professionals.
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