Adding to an existing property — where the permission comes before the drawing.

An extension is the one project where the permission comes before the design, not after it. What you are allowed to build — how high, how far back, how much of the site you may cover — is decided by the Planning Authority and by what your neighbours' properties do, and no drawing is worth paying for until that is understood.
Once it is, an extension is a full project in miniature: structure, then services, then the same ten finishing trades as any fit-out, on a building that has to keep working while you build onto it.
An extension cannot be priced per square metre in advance. What it costs is decided by ground conditions, what the existing structure will carry, and what permission allows — three things nobody knows before somebody looks.
We do not publish a rate for this one. It is not priced per square metre in any way that would survive contact with a real property, and a number we cannot stand behind is worse than no number. It is quoted after the survey, itemised, before anything starts.
Book a free survey and get it priced →
You deal with us, not with the trade. We survey, we quote a fixed price, we bring in the trades from the CheckYourTraders-verified network, and we manage the sequencing around every other trade on site. One point of contact, one contract, one invoice.
Adding to an existing property — where the permission comes before the drawing.
Book a Free Survey →It opens like an app, and the budget calculator works without a signal.