ᐅ Garage – Building Permit – Confusion

Hello,

we have submitted our building application for our single-family house with a (separate) double garage (5.85m x 8.94m (19.2 ft x 29.3 ft)).

The double garage is made with steel panel construction, so it is a prefabricated steel garage.
State: Brandenburg.

The garage is planned to be built with one side (8.94m (29.3 ft)) directly on the property boundary.

The problem now is that, according to the Brandenburg garage regulations, this wall (boundary wall) must be a fire wall!!
This is not the case with our prefabricated steel garage.
At least, this is what our building regulations officer is currently pointing out...

The garage company has already installed several of these garages, also nearby, and they are hearing about this issue for the first time.

Other customers never included their garage in their building application process, so they never had problems here.

Now my question is, can this be true?
What should I do?
Upgrade the one wall into a fire wall – which apparently requires a 24cm (9.4 in) thick wall?
Remove the garage from the building application and then simply install it afterwards?
As far as I know, the garage is basically permit-exempt.

Has anyone experienced similar problems before?

Regards

Building Code of Brandenburg:

(1) Firewalls are room-separating building elements used to divide buildings or building sections. Firewalls must be continuous and aligned vertically across all floors. Firewalls must be made of non-combustible materials and remain fire-resistant even under additional mechanical stress.

(2) Firewalls must be constructed

• as party walls (§§ 16 to 19 of the Brandenburg Neighbor Law) at the boundary of buildings adjacent to neighboring properties; for low-rise residential buildings, construction as shared walls (§§ 9 to 15 of the Brandenburg Neighbor Law) is permitted,
• as external firewalls at the end of buildings located no more than 2.50 m (8 feet 2 inches) from the boundary to neighboring properties, unless a minimum distance of 5 m (16 feet 5 inches) to existing or legally permitted future buildings is ensured,
• as external firewalls between adjoining buildings on the same property,
• as internal firewalls to divide large buildings at intervals not exceeding 40 m (131 feet 3 inches),
• as internal firewalls between apartments and other use units within buildings when the other units pose particular fire hazards.

The first sentence of items 1, 2, and 3 does not apply to outbuildings without habitable rooms and without heating or cooking appliances, with a built volume not exceeding 75 m³ (2,650 cubic feet).

I assume that, based on the final sentence, no firewall is required in these cases.

But roughly 6x6x2.5 meters (20x20x8 feet) amounts to more than 75 cubic meters (2,650 cubic feet).

Oops... I had assumed square meters.

What is on the neighboring property, and how far away is the nearest building?

On the neighboring property, about 10 meters (33 feet) away, there is a house, and the neighbor wants to build their garage exactly on the boundary line where our garage is planned.

Why not team up and switch to precast concrete garages?

The price difference isn’t that significant, especially since steel garages somehow give me the creeps.