Sydney Extensions · Feasibility · Licensed Build
Turn your 600-900sqm block into the home your family needs. We manage land feasibility, CDC/DA approval strategy, architectural design and licensed construction — delivered under one roof.
Land First
Most homeowners come to us because the house no longer fits: kids need rooms, the kitchen is dark, parents may need a granny flat, or moving would mean losing the school zone. We start with the land because the best extension is the one your block, budget and approval pathway can actually support.
NSW land values reached $3.09 trillion at 1 July 2025, with Greater Sydney land values rising 4.5% over the year. The land decision matters before the design decision.
Core Work
01
Rear and ground-floor extensions planned around structure, access, approval risk and long-term land value.
02
Adding a level only when the existing home, structure and planning pathway support the decision.
03
Major reconfiguration, design coordination and licensed construction for established Sydney homes.
Explore
Free Tool
Enter your address and get the first land answer before you speak to a builder: second storey likely, extension and granny flat, dual occupancy potential, or limited.
No aggressive sales calls. Just objective planning data delivered to your inbox, with founder-led follow-up where the block is worth deeper feasibility.
Quick Answers
GY & Co is a licensed NSW builder that starts with land strategy. We help homeowners test feasibility, approval pathway, architectural direction and build logic before committing to a major extension or construction project.
GY & Co focuses on Sydney's North Shore and Eastern Suburbs. Core suburb signals include Gordon, Killara, Lindfield, Roseville, Wahroonga, Turramurra, Pymble, Mosman and Vaucluse.
It reviews your address against planning and site signals before you spend on drawings. These include zoning, lot size, frontage, FSR, height, CDC or DA pathway, second-storey potential, rear extension potential, granny flat options and dual-occupancy potential.
Next Step
The path is simple: 60-second address check, personal follow-up, paid Feasibility Review where useful, then design, approval and licensed construction if the project should proceed. There is no obligation to build with us.