Yes, that's how it is, and there are just so many possibilities... I had already listed all sorts of things that one can do/have in a similar thread here... wait, I'll look for it...
- Exterior blinds/raffstores
- Larger/higher-quality interior doors
- Expandable electrical system
- Sufficient power outlets
- Roof shapes/dormers
- Bus systems KNX etc.
- Waste disposers
- Wooden stairs
- Floor-level showers
- Large bathtubs/corner bathtubs
- Electric aluminum roller shutters on all windows (ground floor + upper floor)
- Waste disposers
- 2x network sockets +1x coax in every room
- Speaker cables in the walls
- Outlets at specific heights/locations (not just in the corner)
- Garden water connection at the terrace
- Rainwater usage
- Well
- Triple glazing and insulated windows
- Mushroom head locking system
- Window/door contacts
- Metal insert in the front door
- Motorized lock
- Better roof tiles
- Weather station
- Alarm system
- Presence simulation
- Central controlled residential ventilation with heat recovery and possibly geothermal exchanger or brine geothermal exchanger
- Air conditioning for summer
- Additional storey height
- Knee wall height increase
- Q3 or Q4 walls
- Lightning protection / surge protection
- Satellite system including socket in every room
- Chimney/fireplace/pellet stove
- Thicker roof beams
- Special cuts in roof beams
- Open/closed roof box
- Exposed roof truss
- Roof box color
- Exterior plaster variants/colors
- Brick cladding
- Base plaster/colored pebble plaster
- Fixed glazing
- Gutter shapes/types/materials
- Ridge shapes/types
- Window casings
- Muntins on/in the windows
- Wooden shutters outside
- Exterior window sills/material/form/color
- Bay windows/conservatories
- Additional insulation (basement, floor slab, ETICS, roof frame)
- Roof windows possibly electrically openable/closable
- Wall construction (with or without ETICS) HRB/monolithic/house-in-house/prefab
- Heating system (underfloor/wall heating) gas/oil/heat pump/combined heat and power/district heating/pellets/solid fuel
- Heating technology (that's a topic in itself) with or without RTR, hydraulic balancing, flow temperatures, control
- Solar thermal or photovoltaics, types of storage
- Hot water preparation through solar thermal, heating, photovoltaics or combinations, size of water tanks
- Colored lighting
- Suspended ceilings
- Various sensors distributed throughout the house
That’s what I wrote back then and what I still remember now... but there’s even more...