How many houses can I buy?

Solution 1:

There are multiple houses / residents to buy.

From what I can find on google there are about 12 houses/castles.

Here is the full list as acquired from this site:

• Edinburgh Castle:
  Located in the heart of the city, Edinburgh Castle offers the best of Horizon's properties
  15,000,000 CR.

• Bamburgh Castle:
  This historical home overlooks Forza Horizon 4's coast, situated alongside the long east-facing beach.
  10,000,000 CR.

• Lake Lodge:
  If castles aren't for you, Lake Lodge is a top-tier lakeside house, overlooking Derwentwater.
  5,000,000 CR. (Free for VIP Pass owners)

• Fairlawn Manor:
  Fairlawn Manor is a bold stately home located in the map center, positioned among the upper-class Forza Horizon 4 homes
  2,000,000 CR.

• Derwent Mansion:
  Found on the west side of Derwentwater, this lakeside property is a cheaper alternative to Lake Lodge.
  1,500,000 CR.

• Castleview Road:
  Found in the southern suburbs of Edinburgh, this offers just a quick drive to the city center
  750,000 CR.

• The Huntsman Lodge:
  Hidden deep into Lakehurst Forest, this house keeps you far away from the busy roads of Horizon
  750,000 CR.

• Thatch Corner:
  This cozy beachside thatched cottage is another quiet retreat from the action.
  500,000 CR.

• Kingfisher Cottage:
  Located beside the Derwentwater reservoir, this historical cottage is tucked just off the roadside.
  350,000 CR.

• Croftdale Farm:
  Take in the Scottish Highlands with this sky-high property, hidden near Glen Rannoch in the north-west corner of the map.
  200,000 CR.

• Sunflower Meadows:
  This white semi-detached cottage is found in Ambleside, offering another excellent option for first-time buyers
  200,000 CR.

• The Gables:
  In an unlikely turn of events, The Gables is a property gifted by film makers after your work as a movie stunt driver.
  Best of all, this location is entirely free.