House Extensions

Start with the house, not the addition

The biggest risk with extensions is designing too quickly. It’s easy to draw a larger kitchen. It’s harder to step back and ask whether the existing layout is the real issue.

Sometimes the best outcome involves internal reconfiguration alongside the extension. Sometimes it means building less than originally expected. Improvement is just as important as expansion.

Before proposing anything, we look at:

How the house currently functions
Where light enters and how it moves through the space
Circulation routes and pinch points
Relationship to garden and neighbouring properties
Structural logic of the existing building

Understand the planning before the design

Householder Applications

Most extensions fall under householder applications. That doesn’t make them straightforward.

Local authorities still assess scale and proportion, impact on neighbours, character of the area, and Green Belt policy.

In parts of Cheshire and North Wales, scrutiny around design quality and neighbour impact can be significant. Overly dominant extensions or poorly considered glazing strategies are often where applications struggle.

We test proposals against policy before submission. That reduces the risk of revisions later.

Permitted Development

In some cases, permitted development rights apply. But relying on PD without understanding the detail can be risky. Depth limits, height restrictions, proximity to boundaries and Article 4 directions all influence what’s actually allowed.

Where appropriate, we advise on lawful development certificates to provide certainty before work begins. Clarity early avoids disputes later.

Technical considerations

Extensions regularly involve more structural work than clients expect.

Taking out load-bearing walls. Introducing steelwork. Altering floor levels. Upgrading insulation to meet current standards. Resolving how new construction physically connects to old.

None of that is cosmetic. It affects cost, sequencing and how the building performs long term.

The junction between existing and new fabric is where most problems sit. Things like thermal bridging, movement, water ingress – poorly resolved details that only show themselves once the building is in use.

That’s why we produce properly coordinated technical drawings. Contractors shouldn’t be working things out on site. Clear information reduces interpretation, limits variations and keeps the build controlled.