Shea CullenNSW Registered Architect 9748 · Updated 10 July 2026A well designed addition is often better value than moving: you keep the street, the neighbours and the land you already own, and you spend the money on the house rather than on stamp duty and agents.
The trick is knowing which approval pathway your project falls under before you design it, because that decides the cost and the timeline. Some additions are exempt development, some are complying development, and some need a full development application. To see what considered additions look like on real homes, have a look at the Tormina kitchen renovation and our Northern Light extension at Erina. Then work through the checklist below.
To see where this process can land, have a look at the kitchen renovation at Tormina and the Northern Light extension at Erina, two additions we designed on the Central Coast. You can also explore the Reeves Street extension at Narara, Blackstone at Niagara Park, The Wing at Lisarow, The Retreat at North Gosford, the Charmhaven sustainable retrofit and the Old Managers Cottage at Narara Ecovillage. For the bigger picture, from feasibility through contracts to construction, see before you build on the Central Coast.