The biggest determinator is how much you can afford to pay. A home with a DETACHED guesthouse requires a big lot. For instance, the city of Yorba Linda requires a 15,000 sqft lot (when I last checked) to build a maximum 1250 sqft guesthouse. Villa Park has similar requirements. In addition, there are setback requirements.
Land is expensive in OC ... and so the prices for such properties will be relatively expensive also.
How expensive usually depends on the size, location, age and amenities of the main house. There are not very many of these properties but they do come on the market.
Occasionally, you will see a house on a large lot where the owners have minimized building cost by simply adding on downstairs square footage designed to be separate guest quarters. These homes also come on the market ... but not very often.
You may also consider a home where a second story has been added containing a large Master bedroom suite. The original master is still down stairs. This arrangement might work for you.
OIr, you might look for a home with a master bedroom downstairs and construct your own upstairs Master suite. But here you get into current cost of construction and the time required to build.
Your home search opens up a bit if you are willing to build your own guest house. Then you have only to look for a home you like with a suitable lot. You would also have to be absolutely sure that the city will approve your plans before you purchase the property. Given the cost of new construction these days, this is probably the most expensive option. It would also take time to build. Better to find it all in place.
If you will send me a private Email explaining your situation and requirements in detail, including price range, I will thoroughly search the available listings that might meet your needs .... and send them on to you for review. I know the whole North Orange County area very well as I have been a Realtor here for a long, long time!
Prudential CA Realty
Blanca Dover, REALTOR
Century21 Hometown Realty
A Realtor will be really help you.
Thanks. You can always contact me if you like.
I would be happy to help you find a home that fits your criteria (with a guest house in the back).
Please contact me at (310) 717-1321 or JamieTian@RodeoRE.com and explain your search criteria in more detail (areas you are looking at, number of bedrooms, budget, etc) and I would be happy to send you a list of available properties and set up appointments for you to view any that you are interested in at no cost.
Feel free to contact me anytime with questions or concerns.