The couple has been married for nine years and share two sons, as well the Bond star's biological son and two adopted kids from his previous marriage to late actress Cassandra Harris.
And Brosnan likes to keep their romance alive with al fresco meals at the site of their new home - but keeps costs down with cheap champagne so they can pour all their finances into a dream property.
He tells Britain's Reveal magazine, "I recently bought a picnic basket, filled it with caviar and a bottle of champagne - not the expensive stuff. She doesn't like to spend money because we're building a house, so everything goes into that right now. We sat there in the bare framework and dangled our toes from the first storey, no windows, with the picnic basket and watched the sun go down.
"We like each other and enjoy each other's company. She's very good at what she does as a mother, as a friend, in our partnership and I know when to say, 'Yes, dear.'
"She beautiful, she still breaks my heart. We've come through a lot together, which is bonding and, God willing, we still have a long way to go."