Is it well-planed, or well-planned?
Also should there be a hyphen?
It should be: This is a well-planned project.
The hyphen is used when it's used as an adjective.
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Adding hyphens, dashes, and parentheses to the following...
The playoff games you should com-e to one--if you get the chance are always very thrilling.
The correct term is "well-planned," with a hyphen. The usage of a hyphen is necessary because "well" (an adverb) is attached to "planned" (a past participle acting as an adjective).
To determine the correct spelling and hyphenation in such cases, you can consult a dictionary. Most dictionaries will provide the correct spelling, hyphenation, and usage of words. Online dictionaries, such as Merriam-Webster or Oxford English Dictionary, can be useful resources for checking such details.