If your modifications are minor, the quickest way is to have them implemented during the site adaptation phase by by a person adajusting the project to local conditions. Modifications that can be made to a read-made house plan without needing the Seller’s approval include:

• use of other building materials for the structure of the Building Facility (foundations, walls, ceilings, stairs, roof trusses) provided that the construction and thermal protection requirements of the Building Facility are met:
  1. modifications in the location of internal partition walls and door openings inside the Building,
  2. modifications in the location and geometry of internal stairs,
  3. modifications in the height of the Building (or the elevation of the ridge) by 10% (increase or decrease), in particular: ground floor floor level above the designed area, height of the ground floor, height of the knee wall)
  4. modifications the roof inclination angle within 5 degrees (increase or decrease)
  5. construction of the basement of all or part of the Building Facility,
  6. modifications in the cross-section of external and internal pillars.
• introducing changes to the finishing materials inside and outside the Building, as well as changing the external colors of the Building, while maintaining aesthetics.
• provided that the correct composition of the facade is maintained (maintaining a common line of positioning window and door openings above or next to each other) and construction principles, the Buyer may:
  1. introduce changes to the arrangement of windows and doors on the facade: eliminate or design additional ones,
  2. change the horizontal and vertical dimensions of windows and doors,
  3. use glass blocks (luxfers),
  4. design additional entrances to the house or garage,
  5. use additional roof windows and roof hatches.
• change the location, eliminate, design additional chimneys (smoke, exhaust, ventilation) and sewage vents, ensuring the correct technical and aesthetic solutions.
• provided that the aesthetics of the Building Facility and the construction principles are taken care of, the Buyer may design (or eliminate) additional external elements of the Building Facility, such as: garage, above-ground terraces, winter gardens, as well as internal elements, such as mezzanines.
• changing the function of rooms, including adapting a garage or other room for residential purposes, provided that they are adapted to the permanent residence of people.
• enlargement or reduction of an existing garage in a typical project.
• redesign of the heating installation, adaptation to a different energy source.
• redesign of the sanitary and electrical installations.