Exterior view of a modern house with large windows, surrounded by palm trees and lush greenery.
Close-up of a wooden floor next to a textured grey carpet with a wooden border in between.

“We worked with Rob & Nadine to design the renovation to our Strata home in Mosman and the outcome is terrific. They were able to create a generous master bedroom suite and home office with a kitchenette on the top floor that opens out to a roof deck with harbour & city views. The house is now generous comfortable beautifully finished & a pleasure to live in.

We recommend their architecture & design services.”

Peter & Kim

Rusty bell hanging on an exterior wall near a glass door, with lush green plants and a pathway in the background.
A modern two-story house with a glass balcony and an outdoor patio featuring patio furniture and decorative items.
View through a window with a white frame and divided panes showing a white textured building with two red-framed windows on an adjacent building.

TESTIMONIALS

'“We engaged Rob & Leoni from Costello + Graham Design to design a new indoor outdoor extension to the back of our house in Elanora Heights. The new open plan areas include a family room alfresco living dining outdoor cooking pool & pool deck. Rob’s experience & tireless effort got us through the tough planning controls and we’re now pressing ahead with the construction stages.

We really appreciate Costello + Graham Design’s collaborative approach & we recommend their services.”
Steve & Michelle

“We engaged Rob & Leoni to design the renovation to our Terrace house and we’re so pleased with the outcome. 
We now have an open plan Living, Dining & contemporary kitchen area that opens out to the renovated rear balcony & views over Manly beach. Many of the period features of the house were retained whilst making the whole ground floor level light, bright & breezy and great for entertaining. They also managed to design in an extra bedroom and bathroom on the second floor and solve some tricky planning issues downstairs.

We fully recommend their services. “
Andy & Martelle

We engaged Rob & Leoni to design the first floor addition to our cottage in Fairlight and the outcome is so good, we’ve gone back for more.  The first floor addition has given us a new master bedroom suite with a generous ensuite, walk in robes & a balcony. There’s also a large home office which is perfect for working from home. We’ve now also asked them
to redesign our kitchen pantry laundry & bathroom.

They provide plenty of design options for review & their collaborative approach is great.
Maryann & Richard

Close-up of a staircase designed by CGD showcasing a frameless glass balustrade with feature timber flooring contrasting against a white wall.
Modern kitchen with white countertops, a vase of pink roses, three woven pendant lights, a wall-mounted TV, large windows, and a dining area with a table of fruit in a bright and airy space designed by CGD.