Prefer to browse? Here is the likely cost picture for the projects we are asked about most. Each splits the two costs people often merge — what you pay the council and Planning Portal, and our fixed fee for the drawings. It is guidance only; the route and exact fee depend on the specific property, which we confirm first.
These are application and drawing costs only. They do not include your build cost — the contractor’s price depends on the specifics of your property and specification, and is the one figure no one can responsibly quote from a form, so we don’t.
House extension (no special designations)
Either permitted development (optional certificate) or a householder application
Either a £274 Lawful Development Certificate to confirm the work is permitted development, or a £548 householder application if permission is needed — plus the £91.02 inc. VAT Portal charge on whichever is submitted.
Our fixed fee for the drawings: Standard Planning Drawings Package, from £1,450–£1,950 inc. VAT.
House extension in a conservation area
Householder planning application (permitted development is often restricted here)
About £639 to the council and Portal — the £548 householder application fee plus the £91.02 inc. VAT Portal charge — where an application is needed.
Our fixed fee for the drawings: Planning Route Review, £395 inc. VAT.
Loft conversion (house)
Either permitted development (optional certificate) or a householder application
Either a £274 Lawful Development Certificate to confirm the work is permitted development, or a £548 householder application if permission is needed — plus the £91.02 inc. VAT Portal charge on whichever is submitted.
Our fixed fee for the drawings: Standard Planning Drawings Package, from £1,450–£1,950 inc. VAT.
Internal alterations to a house
Usually building regulations only — no planning application
Internal alterations to an unlisted house usually need building regulations approval rather than planning permission, so there is normally no planning application fee. Building control charges a separate fee, which varies by the body you use.
Our fixed fee for the drawings: Building Regulations / Technical Drawing Package, from £2,750–£4,950 inc. VAT.
Flat reconfiguration (Licence to Alter)
Freeholder consent (Licence to Alter) — planning only where external or structural work needs it
A Licence to Alter is a private agreement with your freeholder, so there is no council application fee. If the work also needs planning permission, that fee differs from the householder fee and we confirm it for your application.
Our fixed fee for the drawings: Licence to Alter / Flat Refurbishment Drawing Pack, from £1,500–£2,750 inc. VAT.
Basement
Full planning permission — borough basement policy applies
This uses a full planning application rather than the fixed householder fee, so the council fee varies with the scheme — we confirm it at scoping. The £91.02 Portal charge also applies.
Our fixed fee for the drawings: quoted after a £395 Planning Route Review.
Work to a listed building
Listed building consent — often alongside planning permission
Listed building consent itself carries no statutory fee, but many projects also need planning permission (with its own fee and the £91.02 Portal charge). The real cost here is the heritage-led drawings and justification, which we quote after a review.
Our fixed fee for the drawings: quoted after a £395 Planning Route Review.