George Herkes & Son Joinery is rated 5.0 from 62 reviews under East Lothian Trading Standards Trusted Trader, and garage conversions are a good part of what earned it.
The Short Version
- The slab, the damp course, the lintel and the service runs decide the scope, and none of them is visible from the driveway.
- A garage becomes a habitable room only when insulation, ventilation, daylight, heating and escape meet the standards.
- Private housing here expanded from the 1970s onward, so planning can differ between adjacent streets.
- Structure and weatherproofing come first so the building is closed early rather than late.
George Herkes & Son Joinery has worked across East Lothian since 1989, holds East Lothian Trading Standards Trusted Trader accreditation and is rated 5.0 from 62 reviews, and the same team that handles a loft conversion in Cockenzie & Port Seton does the slab, the walls and the finishing.
Send George the address and a photo of the garage and he will come and look at the slab.

Garage Conversion Benefits
George Herkes & Son Joinery is rated 5.0 from 62 reviews under East Lothian Trading Standards Trusted Trader, a council backed scheme that vets traders against rogue trading. What that record is built on is work like this one.
The room already exists
An attached garage is inside the footprint and outside the house. Single skin wall, uninsulated slab laid to a fall, an up and over door that lets weather in. Converted, the same area becomes a room without touching the garden or the roof line.
What changes
The floor is built up, insulated and levelled. Walls and ceiling are lined and insulated. The opening becomes a wall with a window. The outside of the house barely alters. Where the door opening is filled, the new wall is built to match the existing skin so the elevation does not read as a patch, and the window is set to the same head height as the others on that face.
Planning Garage Conversion in Cockenzie & Port Seton? Get a free quote from George Herkes & Son Joinery and find out what it takes.

Garage Conversion Costs in Cockenzie & Port Seton
Cost here is set by what the survey finds under the slab rather than by the size of the garage.
The four things that decide it
Slab condition and level. Whether there is a damp proof membrane. What the lintel over the opening will carry. Where the services run. None of the four is visible from the driveway. A slab laid without a membrane and a lintel sized only for a garage door are the two findings that most often move a job away from its simplest version, and both are established in the first half hour.
What you receive
An itemised written scope after the survey, before anything is booked. Nothing is added later without agreement, which is the same arrangement behind built in cupboards in Cockenzie & Port Seton.

Planning Permission and Permitted Development
Many garage conversions fall under permitted development, and whether yours does is an address question rather than a general one.
What it depends on
The property, and what has been changed before. Private housing here expanded eastward and southward from the 1970s onward, so two houses on adjacent streets can answer differently.
Building standards
Separate from planning and applies either way. A garage is not a habitable room, so insulation, ventilation, daylight, heating and escape all have to satisfy the standards for a room people use. Handled the same way on our garage conversion in Tranent jobs. The floor build up, the wall lining specification and the window opening are drawn to those standards before work starts, and the inspection is booked rather than assumed, because a conversion opened up again afterwards costs twice.

Garage Conversion Process
The order of work is what keeps a conversion from becoming a building site with a family in it.
Survey and structure
Slab, damp course, lintel and services first. Structure and weatherproofing next, so the building is closed early rather than late.
Fabric and services
The opening is filled and glazed, the floor built up and insulated, walls and ceiling lined. Electrics and heating are run before anything is boarded.
Finishing
Joinery last: skirting, architrave, doors and any built in storage. All of it is conversion work done by one team, and the person who looked at the slab hangs the door at the end. Storage is drawn at the same time as the room rather than added afterwards, which usually gives back more usable space than the garage held.
Thinking about Garage Conversion in Cockenzie & Port Seton? A free quote from George Herkes & Son Joinery costs you nothing but the phone call.

Common Questions About Garage Conversion in Cockenzie & Port Seton
Do I need planning permission for a garage conversion here?
Often not, since many fall under permitted development, but it depends on the property and what has been changed before. Private housing in this town expanded eastward and southward from the 1970s onward, so two houses on adjacent streets can answer differently. It is checked against your address before anything is priced. There is more on this in our guide, Do I need building regs to convert my garage into a room?.
What will the slab be like?
Laid to a fall towards the door and uninsulated in most cases, often without a damp proof membrane. That is why the floor is built up, insulated and levelled as part of the conversion rather than covered over with a finish.
Is a converted garage treated as a proper room?
Only when it meets the building standards for one, which covers insulation, ventilation, daylight, heating and escape. Those are drawn in before work starts and the inspection is booked rather than assumed.



