Door Installation – Projects and Qualified Teams

Door installation covers proper fitting of all door types: interior doors with steel or wood frames, entrance doors with security and thermal insulation requirements, fire-rated T30/T60/T90 doors, smoke-control doors, automatic sliding doors, glass doors, and glass pivot/slider sets. Quality depends on opening dimensional accuracy, plumb installation, and tight, durable connection to masonry or drywall. For fire and security doors, installation per certificate is mandatory – deviations void the protection. Example Germany: RAL-GZ 695 'Windows and External Doors', DIN 18101 (interior door dimensions), VOB/C DIN 18355 (joinery), and DIBt fire approvals apply.

FAQ

How much does door installation cost as subcontracted work?

Which sizes are standard?

How are fire doors properly installed?

Which requirements apply to entrance doors?

What are the most common defects?

How long does door installation take?

How much does door installation cost as subcontracted work?: Example Germany: interior door with timber frame installed 200–400 €, with steel frame 250–500 €, fire-rated T30 600–1,200 €, security RC2 entrance door 800–1,800 € (installation only, no door material). In Poland 30–40 % below.
Which sizes are standard?: Example Germany: interior door per DIN 18101: height 198.5 or 211.0 cm, width 73.5/86.0/98.5 cm. Masonry opening larger: height +4 cm, width +5 cm. Special sizes need site survey before order. Sliding doors require side wall area equal to door width.
How are fire doors properly installed?: Example Germany: per DIBt approval with mortar back-fill (T30) or special fire-rated foam with approval. Connection joints per approval with non-combustible materials. Check closer and lock function. Manufacturer plate with approval number is mandatory.
Which requirements apply to entrance doors?: Thermal: Ud ≤ 1.3 W/(m²K) in new build (GEG), ≤ 0.8 W/(m²K) for KfW funding. Security: RC1-RC4 per DIN EN 1627. Acoustic Rw ≥ 32 dB at apartment entrance. Multi-point locking is standard, smart-lock (app control) increasingly common.
What are the most common defects?: Crooked installation from poor plumb adjustment, sticking doors from too tight masonry, leaking connection joints with water ingress, missing mortar back-fill on fire doors (voiding approval), damaged paint finish during transport or installation.
How long does door installation take?: Interior door with standard frame: 1–2 hours for single fitter. Full apartment with 6–8 interior doors: 1–2 days for two-person team. Fire door per approval: 2–3 hours per unit. Entrance door with adjustments: 4–6 hours.

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