First, two brief definitions to help us understand.
QUASI: Resembling
SEMI: Half
A Quasi Semi House is a British term for a Duplex. Literally, "Resembling Half a House".
A semi-detached house (often abbreviated to a "semi") is one of a pair of houses under the same roof, with access past the left side of the left house, and down the right side of the right house, each access private to the relevant property. A quasi-semi is the last house of a terrace or group of houses, maybe only three, that has private access past its non-attached side. Some estate agents use the term quasi-semi for a house in the middle of a terrace but this is a misuse of the term. A quasi-semi must have private access along one side of it from the front garden to the rear garden, and the house connected to it will not have any external access from it's front garden to rear garden BECAUSE IT SHARES A WALL WITH THE THIRD HOUSE.
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A semi detached house has one side of the house that will be attached to another house. A detached house has no shared walls. Most semi detached houses have the garage wall as the shared wall so there is less noise heard from either house.
Exteriors typically call for flat or satin and semi-gloss on trim.
It is basically what ever you prefer. In my opinion, semi-gloss can look cheap and a bit gaudy. I would go with the satin.
The Victorian period ended in 1901, Edwardian is 1901 - 1920
quad house is a house attached on 2 consecutive or perpendicular sides to 2 other houses, each one with private and direct entrance via their front or side garden. When facing any of the four sides of the group, they appear to be semi-detached houses.