How Do You Alter a Listed or Heritage Building?

Listed buildings and heritage properties require a fundamentally different approach to structural engineering. The principle is 'minimum intervention' — doing only what's necessary to make the building safe and functional, while preserving its historic character.

Listed Building Consent

Any alteration to a listed building that affects its character — internally or externally — requires Listed Building Consent (LBC), which is separate from planning permission. This includes structural work that most homeowners would consider routine, like removing a wall or installing a steel beam.

Engineering Approaches

• Use of traditional materials (lime mortar, timber pegs) where possible
• Hidden steelwork within floor and ceiling voids to avoid visible alterations
• Carbon fibre reinforcement for strengthening without adding bulk
• Careful propping and temporary works to protect fragile historic fabric

Working with Conservation Officers

Early engagement with your local authority's conservation officer is essential. At Bourdon Hill, we prepare Heritage Impact Assessments alongside our structural proposals, demonstrating that the engineering solution respects the building's significance.