Build me a castle 40 feet high... [Forty-hour Week]

This is for the one who swings the hammer driving in the nail....[Down In the Valley]

Once I built a tower to the sky, brick and mortar and lime...[Brother, Can You Spare A Dime]

I'd rather be a hammer than a nail...[El Condor Pasa]

All I can think of is some relevant lines from various songs, e.g.:

Take this hammer [huh!], take it to the captain [huh!]...

We'll build a sweet little nest somewhere out in the west...[Let The Rest Of The World Go By]

I'll build you a home in the meadow...[A home In The Meadow; tune: Greensleeves]

For I am married to a house carpenter; I found him a nice young man...[House Carpenter]

Tim Finnegan lived on Walkin Street, a gentle Irishman mighty odd. He'd a bit of a brogue so rich and sweet, and to rise in the world he carried a hod... [Finnegan's Wake]

Genie

Jim, If you or you and the kids want to parody a song to make it fit your own construction, you might rewrite the Stuart Hamblen gospel song "This Old House" as "Our New House" or "Our New Place" or something like that. It's about a [metaphoric] house wearing out; you could reverse it and make it about either the need for remodeling/expansion or the new construction itself. Good luck.