Specialist in Garage Conversions - St Albans & Hertfordshire

By Stag Builders of Hertfordshire – Trusted Garage Conversion Specialists

Considering a garage conversion in St Albans or within Hertfordshire? Transforming your underused or cluttered garage into a functional living space is one of the most cost-effective ways to add value and extra room to your home. Whether it's an office, guest room, playroom, or gym, a garage conversion offers a smart alternative to a full home extension.

Compared to traditional extensions, a garage conversion creates significantly less disruption to your daily life during construction and is typically faster and more affordable. If you have an attached garage that's currently gathering dust, converting it could be the perfect solution to unlock your home's hidden potential.

Garage Conversion Cost

The cost of a garage conversion varies depending on the complexity of the work, the size of the garage, and the finishes chosen. A single garage conversion in the Hertfordshire region can range between £14,000 and £25,000. Plus VAT added at 20% to the cost.

Promotional offer till March 2026

A limited period promotional offer on integral single garage conversions in the Hertfordshire region only.

Conversion Package 1

Garage Conversion while retaining the existing garage door.

1. The existing garage door remains in its current external position to preserve the property’s street-facing appearance. A new insulated wall is constructed directly behind the garage door on the interior side, fully enclosing the converted space. This wall will block all internal access to the original garage door and create a secure, thermal barrier between the external door and the new habitable room.

2. Included is an internal door section that is cut out to serve as an entry point, connecting the primary residence to the integral garage, which includes the door casing and a fire-rated door.

3. A new timber-framed subfloor is constructed, DPM-lined and insulated in accordance with the current Building Regulations.

4. The internal walls that do not adjoin another property will have a timber stud frame constructed to accommodate the required insulation and vapour control layers to ensure the new room meets current Building Regulations for thermal performance, energy efficiency

5. All the walls and ceiling will be plasterboarded and plastered.

6. Up to (2) Double socket electrical points.

7. Up to (4) LED downlight spots.

8. Electrical heating system.

9. Walls are painted in colour (white).

10. Supply and Installation of laminate flooring.

11. Skirting installed and painted.

£14,950.00 exc VAT

Conversion Package 2

Garage Conversion with the existing garage door permanently removed.

1. The existing garage door is permanently removed to facilitate the installation of a new front brick section, which can be rendered if preferred, and features a new front-facing window.

2. Included is an internal door section that is cut out to serve as an entry point, connecting the primary residence to the integral garage, which includes the door casing and a fire-rated door

3. A new timber-framed subfloor is constructed, DPM-lined and insulated in accordance with the current Building Regulations

5. All the walls and ceiling will be plasterboarded and plastered.

6. Up to (4) Double electrical points.

7. Up to (6) LED downlight spots.

8. Electrical heating system ( or gas if accessible).

9. Walls painted in colour (white).

10. Supply and installation of laminate flooring.

11. Skirting installed and painted.

£17,950.00 exc VAT

Below are pictures showcasing examples of a garage conversion that retains the existing garage door. This solution is perfect for homeowners looking to transform their garage into a functional living space or workspace while maintaining the character and convenience of the original door. It offers a practical yet stylish conversion, creating a seamless interior upgrade without altering the exterior appearance.

The converted garage at the end was designed to keep in align with the aesthetic of the neighbouring garage fronts. This decisive approach secured the necessary planning permission.

New French Doors Into Garage Conversion.png

"We have enhanced the living area by replacing an old wall radiator with a modern upright radiator positioned on the left. Furthermore, we created a more open environment by cutting through from the living room into the garage, featuring sophisticated French doors that facilitate access to the newly converted garage."

This project involved cutting through the side wall to establish a new access point to the garden, as well as installing a new window to enhance the influx of natural light. The result is a refined and inviting new space, ideal for and office or dinning room.

Garden Side Door into Garage Conversion .png

Side door from the outside

Rear window from the outside

Day of compleation Video

Garage Conversion Ideas

Popular garage conversion ideas and considerations:

Garage Conversion Ideas:

Home Office/Study Garage Conversion:
A quiet, dedicated space for working from home, with options for soundproofing and natural light.

Playroom/Media Room Garage Conversion:
A fun, versatile space for children or adults, with options for entertainment systems and comfortable seating.

Extra Bedroom/Guest Suite Garage Conversion:
Ideal for accommodating guests or family members, with the potential for an ensuite bathroom.

Gym Garage Conversion:
A space for exercise and fitness, with options for equipment storage and ventilation.

Utility Room/Storage Garage Conversion:
A practical space for laundry and storage, often connected to the main house.

Granny Annexe Garage Conversion:
A self-contained living space for older relatives or family members needing independence.

Planning Permission Considerations:

Planning Permission for a Garage Conversion:
Depending on the type of conversion required. Planning permission may be required when converting a garage into a living space. We always advise clients to ensure they allow for the cost of any necessary planning services.

Building Regulations for a Garage Conversion:
Building regulations must be adhered to, especially regarding insulation, ventilation, electrical installations, and fire safety.

Structural Requirements for a Garage Conversion:
Pre-examine the existing structure for soundness, including the roof, walls, and floor.

Insulation and Ventilation for a Garage Conversion:
Garages are often poorly insulated, so proper insulation and ventilation are crucial.

How long does it take to convert a garage?
A single garage conversion typically takes 3-4 weeks, depending on the complexity of the job.

It's worth noting that a garage conversion can increase a property's value by up to 30%.

Planning Permission