Glass & Steel Interior Doors -
Design: Single
The single steel interior door is an option for those who would like a more traditional door while keeping the modern steel look. Also available with one or two sidelites.
Standard Steel Door Models
slabs are available in 30, 34, 36" width and other custom sizes
Single - Narrow (In-Stock)
Single
Single with 1 Sidelite

STL-W1-36x96-1SL18-W1
Steel Interior Door
Single with 1 Sidelite - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 97-3/8"
Sidelite Width: 18"
Single with 1 Sidelite - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 97-3/8"
Sidelite Width: 18"

STL-W3-36x96-1SL18-W3
Steel Interior Door
Single with 1 Sidelite - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 97-3/8"
Sidelite Width: 18"
Single with 1 Sidelite - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 97-3/8"
Sidelite Width: 18"

STL-W4-36x96-1SL18-W4
Steel Interior Door
Single with 1 Sidelite - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 97-3/8"
Sidelite Width: 18"
Single with 1 Sidelite - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 97-3/8"
Sidelite Width: 18"

STL-W4P-36x96-1SL18-W3
Steel Interior Door
Single with 1 Sidelite - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 97-3/8"
Sidelite Width: 18"
Single with 1 Sidelite - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 97-3/8"
Sidelite Width: 18"

STL-W6-36x96-1SL18-W3
Steel Interior Door
Single with 1 Sidelite - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 97-3/8"
Sidelite Width: 18"
Single with 1 Sidelite - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 97-3/8"
Sidelite Width: 18"

STL-W6P-36x96-1SL18-W4
Steel Interior Door
Single with 1 Sidelite - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 97-3/8"
Sidelite Width: 18"
Single with 1 Sidelite - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 97-3/8"
Sidelite Width: 18"

STL-W8-36x96-1SL18-W4
Steel Interior Door
Single with 1 Sidelite - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 97-3/8"
Sidelite Width: 18"
Single with 1 Sidelite - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 97-3/8"
Sidelite Width: 18"
Single with 1 Sidelite - Wide

STL-W1-36x96-1SL36-W1
Steel Interior Door
Single with 1 Sidelite - Wide - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 36"
Single with 1 Sidelite - Wide - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 36"

STL-W3-36x96-1SL36-W3
Steel Interior Door
Single with 1 Sidelite - Wide - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 36"
Single with 1 Sidelite - Wide - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 36"

STL-W4-36x96-1SL36-W4
Steel Interior Door
Single with 1 Sidelite - Wide - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 36"
Single with 1 Sidelite - Wide - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 36"

STL-W4P-36x96-1SL36-W6
Steel Interior Door
Single with 1 Sidelite - Wide - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 36"
Single with 1 Sidelite - Wide - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 36"

STL-W6-36x96-1SL36-W6
Steel Interior Door
Single with 1 Sidelite - Wide - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 36"
Single with 1 Sidelite - Wide - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 36"

STL-W6P-36x96-1SL36-W8
Steel Interior Door
Single with 1 Sidelite - Wide - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 36"
Single with 1 Sidelite - Wide - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 36"

STL-W8-36x96-1SL36-W8
Steel Interior Door
Single with 1 Sidelite - Wide - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 36"
Single with 1 Sidelite - Wide - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 36"
Single with 2 Sidelites

STL-W1-36x96-2SL18-W1
Steel Interior Door
Single with 2 Sidelites - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 18"
Single with 2 Sidelites - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 18"

STL-W3-36x96-2SL18-W3
Steel Interior Door
Single with 2 Sidelites - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 18"
Single with 2 Sidelites - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 18"

STL-W4-36x96-2SL18-W4
Steel Interior Door
Single with 2 Sidelites - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 18"
Single with 2 Sidelites - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 18"

STL-W4P-36x96-2SL18-W3
Steel Interior Door
Single with 2 Sidelites - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 18"
Single with 2 Sidelites - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 18"

STL-W6-36x96-2SL18-W3
Steel Interior Door
Single with 2 Sidelites - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 18"
Single with 2 Sidelites - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 18"

STL-W6P-36x96-2SL18-W4
Steel Interior Door
Single with 2 Sidelites - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 18"
Single with 2 Sidelites - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 18"

STL-W8-36x96-2SL18-W4
Steel Interior Door
Single with 2 Sidelites - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 18"
Single with 2 Sidelites - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 97-3/8"
Sidelite Width: 18"
Single with 2 Sidelites - Wide

STL-W1-36x96-2SL36-W1
Steel Interior Door
Single with 2 Sidelites - Wide - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 97-3/8"
Sidelite Width: 36"
Single with 2 Sidelites - Wide - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 97-3/8"
Sidelite Width: 36"

STL-W3-36x96-2SL36-W3
Steel Interior Door
Single with 2 Sidelites - Wide - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 97-3/8"
Sidelite Width: 36"
Single with 2 Sidelites - Wide - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 97-3/8"
Sidelite Width: 36"

STL-W4-36x96-2SL36-W4
Steel Interior Door
Single with 2 Sidelites - Wide - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 97-3/8"
Sidelite Width: 36"
Single with 2 Sidelites - Wide - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 97-3/8"
Sidelite Width: 36"

STL-W4P-36x96-2SL36-W6
Steel Interior Door
Single with 2 Sidelites - Wide - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 97-3/8"
Sidelite Width: 36"
Single with 2 Sidelites - Wide - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 97-3/8"
Sidelite Width: 36"

STL-W6-36x96-2SL36-W6
Steel Interior Door
Single with 2 Sidelites - Wide - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 97-3/8"
Sidelite Width: 36"
Single with 2 Sidelites - Wide - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 97-3/8"
Sidelite Width: 36"

STL-W6P-36x96-2SL36-W8
Steel Interior Door
Single with 2 Sidelites - Wide - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 97-3/8"
Sidelite Width: 36"
Single with 2 Sidelites - Wide - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 97-3/8"
Sidelite Width: 36"

STL-W8-36x96-2SL36-W8
Steel Interior Door
Single with 2 Sidelites - Wide - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 97-3/8"
Sidelite Width: 36"
Single with 2 Sidelites - Wide - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 97-3/8"
Sidelite Width: 36"
Single with Transom

STL-W1-36x96-TR24-W1
Steel Interior Door
Single with Transom - Custom
Slab: 36 x 96"
Unit: 37-7/8 x 121-3/8"
Single with Transom - Custom
Slab: 36 x 96"
Unit: 37-7/8 x 121-3/8"

STL-W3-36x96-TR24-W1
Steel Interior Door
Single with Transom - Custom
Slab: 36 x 96"
Unit: 37-7/8 x 121-3/8"
Single with Transom - Custom
Slab: 36 x 96"
Unit: 37-7/8 x 121-3/8"

STL-W4-36x96-TR24-W1
Steel Interior Door
Single with Transom - Custom
Slab: 36 x 96"
Unit: 37-7/8 x 121-3/8"
Single with Transom - Custom
Slab: 36 x 96"
Unit: 37-7/8 x 121-3/8"

STL-W4P-36x96-TR24-W1
Steel Interior Door
Single with Transom - Custom
Slab: 36 x 96"
Unit: 37-7/8 x 121-3/8"
Single with Transom - Custom
Slab: 36 x 96"
Unit: 37-7/8 x 121-3/8"

STL-W6-36x96-TR24-W1
Steel Interior Door
Single with Transom - Custom
Slab: 36 x 96"
Unit: 37-7/8 x 121-3/8"
Single with Transom - Custom
Slab: 36 x 96"
Unit: 37-7/8 x 121-3/8"

STL-W6P-36x96-TR24-W1
Steel Interior Door
Single with Transom - Custom
Slab: 36 x 96"
Unit: 37-7/8 x 121-3/8"
Single with Transom - Custom
Slab: 36 x 96"
Unit: 37-7/8 x 121-3/8"

STL-W8-36x96-TR24-W1
Steel Interior Door
Single with Transom - Custom
Slab: 36 x 96"
Unit: 37-7/8 x 121-3/8"
Single with Transom - Custom
Slab: 36 x 96"
Unit: 37-7/8 x 121-3/8"
Single with 1 Sidelite with Transom

STL-W1-36x96-1SL18-W1-TR24-W1
Steel Interior Door
Single with 1 Sidelite with Transom - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 121-3/8"
Sidelite Width: 18"
Single with 1 Sidelite with Transom - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 121-3/8"
Sidelite Width: 18"

STL-W3-36x96-1SL18-W3-TR24-W1
Steel Interior Door
Single with 1 Sidelite with Transom - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 121-3/8"
Sidelite Width: 18"
Single with 1 Sidelite with Transom - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 121-3/8"
Sidelite Width: 18"

STL-W4-36x96-1SL18-W4-TR24-W1
Steel Interior Door
Single with 1 Sidelite with Transom - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 121-3/8"
Sidelite Width: 18"
Single with 1 Sidelite with Transom - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 121-3/8"
Sidelite Width: 18"

STL-W4P-36x96-1SL18-W3-TR24-W1
Steel Interior Door
Single with 1 Sidelite with Transom - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 121-3/8"
Sidelite Width: 18"
Single with 1 Sidelite with Transom - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 121-3/8"
Sidelite Width: 18"

STL-W6-36x96-1SL18-W3-TR24-W1
Steel Interior Door
Single with 1 Sidelite with Transom - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 121-3/8"
Sidelite Width: 18"
Single with 1 Sidelite with Transom - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 121-3/8"
Sidelite Width: 18"

STL-W6P-36x96-1SL18-W4-TR24-W1
Steel Interior Door
Single with 1 Sidelite with Transom - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 121-3/8"
Sidelite Width: 18"
Single with 1 Sidelite with Transom - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 121-3/8"
Sidelite Width: 18"

STL-W8-36x96-1SL18-W4-TR24-W1
Steel Interior Door
Single with 1 Sidelite with Transom - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 121-3/8"
Sidelite Width: 18"
Single with 1 Sidelite with Transom - Custom
Slab: 36 x 96"
Unit: 55-7/8 x 121-3/8"
Sidelite Width: 18"
Single with 1 Sidelite - Wide with Transom

STL-W1-36x96-1SL36-W1-TR24-W1
Steel Interior Door
Single with 1 Sidelite - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 36"
Single with 1 Sidelite - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 36"

STL-W3-36x96-1SL36-W3-TR24-W1
Steel Interior Door
Single with 1 Sidelite - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 36"
Single with 1 Sidelite - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 36"

STL-W4-36x96-1SL36-W4-TR24-W1
Steel Interior Door
Single with 1 Sidelite - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 36"
Single with 1 Sidelite - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 36"

STL-W4P-36x96-1SL36-W6-TR24-W1
Steel Interior Door
Single with 1 Sidelite - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 36"
Single with 1 Sidelite - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 36"

STL-W6-36x96-1SL36-W6-TR24-W1
Steel Interior Door
Single with 1 Sidelite - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 36"
Single with 1 Sidelite - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 36"

STL-W6P-36x96-1SL36-W8-TR24-W1
Steel Interior Door
Single with 1 Sidelite - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 36"
Single with 1 Sidelite - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 36"

STL-W8-36x96-1SL36-W8-TR24-W1
Steel Interior Door
Single with 1 Sidelite - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 36"
Single with 1 Sidelite - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 36"
Single with 2 Sidelites with Transom

STL-W1-36x96-2SL18-W1-TR24-W1
Steel Interior Door
Single with 2 Sidelites with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 18"
Single with 2 Sidelites with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 18"

STL-W3-36x96-2SL18-W3-TR24-W1
Steel Interior Door
Single with 2 Sidelites with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 18"
Single with 2 Sidelites with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 18"

STL-W4-36x96-2SL18-W4-TR24-W1
Steel Interior Door
Single with 2 Sidelites with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 18"
Single with 2 Sidelites with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 18"

STL-W4P-36x96-2SL18-W3-TR24-W1
Steel Interior Door
Single with 2 Sidelites with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 18"
Single with 2 Sidelites with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 18"

STL-W6-36x96-2SL18-W3-TR24-W1
Steel Interior Door
Single with 2 Sidelites with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 18"
Single with 2 Sidelites with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 18"

STL-W6P-36x96-2SL18-W4-TR24-W1
Steel Interior Door
Single with 2 Sidelites with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 18"
Single with 2 Sidelites with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 18"

STL-W8-36x96-2SL18-W4-TR24-W1
Steel Interior Door
Single with 2 Sidelites with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 18"
Single with 2 Sidelites with Transom - Custom
Slab: 36 x 96"
Unit: 73-7/8 x 121-3/8"
Sidelite Width: 18"
Single with 2 Sidelites - Wide with Transom

STL-W1-36x96-2SL36-W1-TR24-W3
Steel Interior Door
Single with 2 Sidelites - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 121-3/8"
Sidelite Width: 36"
Single with 2 Sidelites - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 121-3/8"
Sidelite Width: 36"

STL-W3-36x96-2SL36-W3-TR24-W3
Steel Interior Door
Single with 2 Sidelites - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 121-3/8"
Sidelite Width: 36"
Single with 2 Sidelites - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 121-3/8"
Sidelite Width: 36"

STL-W4-36x96-2SL36-W4-TR24-W3
Steel Interior Door
Single with 2 Sidelites - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 121-3/8"
Sidelite Width: 36"
Single with 2 Sidelites - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 121-3/8"
Sidelite Width: 36"

STL-W4P-36x96-2SL36-W6-TR24-W6
Steel Interior Door
Single with 2 Sidelites - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 121-3/8"
Sidelite Width: 36"
Single with 2 Sidelites - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 121-3/8"
Sidelite Width: 36"

STL-W6-36x96-2SL36-W6-TR24-W6
Steel Interior Door
Single with 2 Sidelites - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 121-3/8"
Sidelite Width: 36"
Single with 2 Sidelites - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 121-3/8"
Sidelite Width: 36"

STL-W6P-36x96-2SL36-W8-TR24-W6
Steel Interior Door
Single with 2 Sidelites - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 121-3/8"
Sidelite Width: 36"
Single with 2 Sidelites - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 121-3/8"
Sidelite Width: 36"

STL-W8-36x96-2SL36-W8-TR24-W6
Steel Interior Door
Single with 2 Sidelites - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 121-3/8"
Sidelite Width: 36"
Single with 2 Sidelites - Wide with Transom - Custom
Slab: 36 x 96"
Unit: 109-7/8 x 121-3/8"
Sidelite Width: 36"
Single
Steel & Glass Interior Door Installation
- General Instructions
- Installer and Builder Information
- Installation Tools
- Wall Opening Preparation
- How to Determine Unit Size Base on Your Finished Opening
- Installing Door Frame
How to Measure Steel Interior Door
DESCRIPTION | WIDTH [mm] | HEIGHT [mm] |
---|---|---|
Sizes range of „x” construction | WX = any width* | HX = any height* |
Hole size in a wall (before plastering) | WO = WX + 20 | HO = HX + 10 |
Hole size in a wall (after plastering) | WO = WX + 5 | HO = HX + 5 |
LEGEND:
- WO - hole width in a wall/passage
- HO - hole height in a wall/passage
- WX - total width of door construction
- HX- total height of door construction
* Size limit depend on the conditions and functionality of the buildings. For non-standard size a confirmation is required.