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Case Study · Full Single Garage Conversion

Huxley Close Full Garage Conversion

Attached single garage converted into a bright, fully insulated playroom with a cut vaulted pitched roof, two Velux roof windows, bifolding doors, herringbone LVT flooring and an RSJ knockthrough into the main house.

Finished garage conversion with vaulted pitched roof, Velux rooflight and herringbone LVT flooring — Huxley Close — Finished interior — vaulted pitched roof, two Velux windows, bifolding doors, herringbone LVT

Project type

Full single conversion

Key features

Cut vaulted pitched roof · Two Velux windows · Bifolding doors · RSJ knockthrough

Flooring

Herringbone LVT (50m²+ levelled)

Contractor

JB Building Projects Ltd

Before

The attached single garage had an up-and-over door, single-skin brickwork and an exposed trussed roof. Exploratory excavation established that the existing floor was block-and-beam, so a new strip foundation was not required.

Original garage interior showing exposed trussed roof and brick walls — Huxley Close, before conversion — Original interior — exposed trussed roof; floor identified as block-and-beam after excavation

During

The garage-door opening was bricked up and a new window formed. A structural RSJ created the knockthrough into the main house. The trussed roof was converted to a cut vaulted pitched roof and two Velux windows were fitted. The project record specifies 70mm PIR floor insulation with 100mm upstands, 100mm PIR wall insulation with a 50mm ventilated cavity, and 170mm roof PIR split as 100mm between rafters plus 70mm continuously over the rafters, while maintaining a 50mm ventilated roof gap to the vented soffits.

The floor, structure and thermal build-up were selected for this property. See our garage conversion Building Regulations guide for the checks that commonly apply to a new project.

Garage-door opening partly bricked up for a new window with floor insulation laid — Huxley Close during conversion — New window opening formed in matching brickwork, with the floor build-up visible

PIR insulation fitted around the vaulted cut roof and rooflight openings — Huxley Close during conversion — Vaulted cut roof insulation — 100mm PIR between rafters plus 70mm continuous layer over rafters

Structural steel installed above the new opening between the garage and main house — Huxley Close during conversion — RSJ knockthrough — new opening formed between the garage and the main house

Finished

The completed conversion is a bright, fully insulated room connected to the main house through the RSJ knockthrough. It features a cut vaulted pitched roof, two Velux windows, bifolding doors and herringbone LVT. More than 50 square metres of the downstairs were self-levelled before the LVT was installed. If this project has prompted you to think about your own garage, our guide on choosing the right garage conversion specialist sets out the checks worth making before you appoint anyone.

View through the new structural opening into the finished playroom — Huxley Close garage conversion — View from the main house through the new opening into the finished room

Finished room viewed towards the new front window with herringbone LVT flooring — Huxley Close — Finished room from the window end — herringbone LVT and vaulted pitched roof

Documented Project Scope

Garage-door opening bricked up and new window formed

Block-and-beam floor confirmed after exploratory excavation

RSJ structural knockthrough to main house

Cut vaulted pitched roof formed from existing trussed roof

Two Velux windows supplied and fitted

Bifolding doors supplied and fitted

Floor: 70mm PIR with 100mm perimeter upstands to reduce cold bridging

Walls: 100mm PIR plus maintained 50mm ventilated cavity

Roof: 170mm PIR split as 100mm between rafters plus 70mm continuously over rafters, with 50mm ventilated gap to vented soffits

50m²+ levelled with self-levelling compound

Herringbone LVT flooring

First and second fix electrics — sockets, lighting, consumer unit connection

Plasterboarding and skim plastering

Skirting, architrave and decoration

Photographic record retained across opening-up, structure, insulation and finishing stages

This list records the work shown for this project. Structural and insulation details are property-specific and are not a standard specification for every garage conversion.

Full Single Garage Conversion Garage Conversions Overview All Projects Cost Guide — Essex Building Regulations Chelmsford Partial Conversion Chelmsford Double Conversion

Interested in a Similar Conversion?

Full single garage conversions currently start from £14,000. Tell us about your garage, the room you want to create and any structural changes you are considering, and we will arrange the next step.

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