Should an extension match the old house?

Be specific about what you love

'Keep the character' can mean several different things. You might mean the tall windows, the timber underfoot, the generous door surrounds or the feeling of a smaller room opening into a larger one. Those preferences could lead to quite different designs.

I would choose three features and explain what each contributes. A favourite window might matter because of its proportions, not its colour. An old timber floor might matter because of its texture, not because every new room needs the same boards.

• What would you miss if it disappeared?
• Is it the material, shape, detail or atmosphere you value?
• Which existing features are simply there, rather than important to you?

Give the rooms a few things in common

My preference is to find a small number of connections and make them convincing. That could be a repeated timber tone, a family of door handles or a consistent approach to window proportions. It does not need to be every surface.

In a hypothetical bungalow extension, I might explore keeping decorative trim in the front rooms and using simpler detailing at the back, with a shared wall colour linking them. That is an option to test, not a rule. The original home should still feel like a valued part of the result.

Do not leave a near-match to chance

MBIE's renovation guidance points out that matching existing materials, finishes and dimensions can be difficult. Older profiles and newer products may not line up as expected. 'Use something similar' is therefore not a complete instruction.

I would ask to compare actual samples beside the retained material and see a drawing of where they meet. If an exact match is impractical, a deliberate change at a doorway or another clear boundary may be more satisfying than a close imitation that looks accidental. Ask the team to explain the options and record the agreed finish.

• What is being retained, repaired or replaced?
• Where exactly does the new material begin?
• Which junction needs a sample or drawing before it is agreed?

Look at the transition, not just the new room

Ask for a view from the existing room into the addition, and another looking back. A section, a drawing cut through the building, can explain ceiling heights and level changes. Any construction solution still needs the appropriate technical design.

I would also ask whether the transition could feel like a useful place in its own right. Perhaps it frames a garden view or creates a pause between a quiet room and a social one. It need not be disguised.

The published Raumati Beach House design describes removing a conservatory and using a deck and pergola to reshape the beach-facing edge. For me, it is a useful prompt to consider the whole composition rather than treating each alteration as a separate feature.

Make a one-page connection brief

Take a photograph of the place where old and new will meet. Beside it, write three short lists: carry through, deliberately change and still undecided. Add one reference image for each of the first two lists, with a note explaining the particular detail you mean.

Bring that page to your next design conversation. We can use it to explore how the spaces could belong together without deciding every finish immediately. If you are at the beginning, I am happy to talk through what you would like to preserve and what you are ready to change.