Extending a cottage
Reviewed October 2026 · Not legal, planning or financial advice
Traditional Irish cottages are narrow, low and often built of stone with lime mortar. Extensions that respect that scale tend to succeed — in planning and in value.
Approaches that work
- A modest rear extension in a contrasting but restrained material.
- A glazed link connecting the cottage to a separate new volume, keeping the original form legible.
- Avoiding raising the original roof where possible.
Things to check
- Whether the cottage is a protected structure or in an Architectural Conservation Area.
- Breathable construction: cement renders and modern membranes can trap damp in old stone walls.
- Foundations are often shallow or absent; engineer input is essential where new meets old.
Regulations and their interpretation change. This guide explains the position as we understand it in October 2026. Confirm what applies to your house with an architect, planning consultant or your local authority before relying on it.