What all is available?

It depends on your level

but if you're level 55 you should have these, not every house can be build on all lots  (s = standard lot, p = premium lot)

Architect houses are only available for a timed period, so I'm not listing them, they can return in a later change

Price and time depends on how many houses you already have.

Houses

Unfurnished Studio (s+p)

Furnished Townhouse (s+p)

One Bedroom Home (s+p)

Mansion (s+p)

Empty Lot (s+p)

The Sanctuary (s+p)

Dark Secret (s+p)

Skater’s Dream Pad (s+p)

Medieval Castle (s+p)

Designer Home (s+p)

Player Designed House (s+p)

Japanese Retreat (s+p)

Sci Fi Shuttle (s+p)

Neo Tokyo (s+p)

Geek Heaven (s+p)

Sim Cinema (s+p)

Hallway House (s+p)

Two Story Mansion (p)

Scandinavian House (s+p)

Teen Mansion (p)

Renovator’s Dream (s+p)

Two Story Unfurnished House (s+p)

Three Story Unfurnished House (s+p)

Quests

Beachside Escape (p)

Haunted House (s+p)

Wizards Cottage (s+p)

DIY Model House (s+p)

Latin Villa (s+p)

Private Island Villa (private island only)

Mezzanine House (s+p)

- You can have other templates depending on which events you have completed, most events returns so you have a second chance of getting the prizes and templates

Downtown

Empty Penthouse

Two and a Half Beds

Sanctuary in the Sky

Lofty Penthouse

Houseboats

The Tiny Tight Pocket

The Cavernous Cruiser

The Pint-Sized Prince

The Royal Wavecutter

List gotten from the Girl Who Games, my go to blog for everything SFP