Keeping termites in the garden largely means leaving them alone.  Keeping those termites out of you house can be harder.  For the subterranean pest forms, particularly some species of Coptotermes and Reticulitermes, it is probably better not to take the risk.  To be sure, you need to know what species you have and how much of a risk they are in your area. 

If your garden termites are dampwood, then they are much less likely to enter a well-built, properly drained building than the subterraneans (which enjoy tunnelling so much more).  If you live in an area of known drywood termite hazard, then you'll be slightly increasing your risks if you leave known drywood colonies alone.

Keeping the subterranean termites from finding the house is best done by keeping things dry and inspectable.  See my Avoid page.

Things will be easier if your house has effective termite barriers, especially proper physical barriers (not relying on a chemical deterrent).  If yyour house does have a chemical barrier, you'll do better if it is a pyrethroid (like bifenthrin) rather than a non-repellent (like fipronil or imidacloprid) as the non-repellents can cut your termite population, sometimes even killing colonies.

In any case, you'll still need to have a proper inspection done (not less than once a year) to have a good chance of finding any incursion before serious damage can happen.