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Extension design — Architect — Professionals
Extension projects require investigation of both the proposed footprint and the existing building. Providers should identify connection details, client priorities and specialist inputs early, and communicate unresolved constraints before promising a particular design outcome.
Service scope
Design of additional building space and its connection to an existing property, addressing the client's room needs, site constraints and interfaces with the original structure. Architectural design is coordinated with engineering and other advice according to the appointed scope.
What is normally included
- Extension feasibility and layout options
- Design of new-to-existing connections
- Agreed application or technical-stage drawings
What is not included
- Guaranteed consent for additional floor area
- Construction and structural design automatically included
Qualification checks
- Confirm room and circulation needs
- Review boundaries and available site records
- Identify existing-building interfaces
- Allocate drainage and structural advice
- Agree stages and decision points
Quote guidance
Price the appointed design stages and options, identifying measured surveys and engineering separately. Define revision allowances and construction-stage services without presenting an early concept fee as a complete project budget.
Lead risks
- Desired space may conflict with site restrictions
- Late changes to existing rooms can broaden the commission
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