Carport Garage Cost Estimate - Who knows about prices?

Hello,
the following offer from BU for Carport- und Geräteraumanlage is available:

Carport- und Geräteraumanlage with flat roof as follows:
- External dimensions of the carport overall 3.50 m x 6.00 m without side walls
- External dimensions of the storage room overall 3.50 m x 3.00 m including wooden side walls, one plastic door, one plastic window in continuation of the carport
- Partially attached to the house
- Earthworks according to construction description
- Zimmermannsmäßige Ausführung
- Holzkonstruktion in KVH (Konstruktionsvollholz)
- Galvanized post supports in concrete foundation
- Ceiling paneling with chamfered boards
- Upper side bitumen sealing
- Gefälle in der Dachhaut
- Aluminum roof edge profile
- Wall connection to the residential house
- Entwässerung über Dachrinne on the short side including downpipe
- One surface-mounted light source with switch in the storage room
- One surface-mounted socket in the storage room
- Without paving work (to be done by the client)
- Coating with a lasur in conjunction with the painting works
13,990.00 €

Is this realistic?

In the second case, there is also the following:
Without painting works, on the carport and on the storage room. These will be executed by the client themselves
12,860.00 €.

I have not yet obtained offers from other companies, I wanted to ask you first if anyone has experience with this? (It must be cost-effective/sustainable and not a cheap product.)

I just realized that I was rude and sent my message without a closing greeting.
Sorry :-)

Best regards
Reza