I doubt a builder will want to hold a deposit for 1yr prior to building. If you dont mind me asking, why are you not ready to build now?
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Usually how this works is you first reserve a lot with a modest deposit. Until you sign the contract for the house, the builder can "bump" you if someone else comes along who is ready to sign. (You'll get the deposit back in that case.)
If you want a guaranteed lot, you'd have to negotiate something else, probably involving a much larger or non-refundable deposit. At some point this becomes risky for you, and since it's non-standard you'd want a lawyer to review the agreement. It's a lot harder to get a deposit back from a builder than from a broker -- hence the special waiver (hand money notice) most brokers use for new construction.