Le portail de ma maison
Here's a breakdown:
* Le - The (masculine definite article)
* portail - Gate
* de - of, belonging to
* ma - my (feminine possessive adjective)
* maison - house
You could also use the more informal la grille de ma maison if you're talking about a simple fence with a gate.
* La - The (feminine definite article)
* grille - fence (often used to mean a gate)
* de - of, belonging to
* ma - my (feminine possessive adjective)
* maison - house