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Professional Garage Conversions

Garage Conversions in Hertfordshire

Your garage could be the extra room your family needs. We convert single and double garages into beautiful, fully insulated living spaces — from home offices and gyms to bedrooms, playrooms, and annexes. A garage conversion is one of the most cost-effective ways to add space to your home.

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Leeway Brothers is not itself Gas Safe or NAPIT registered. Gas work is carried out by independent Gas Safe registered businesses and notifiable electrical work by NAPIT registered electricians, under their own registration. How this works

What We Offer

Our Garage Conversions

We offer a comprehensive range of garage conversions to homeowners across Hertfordshire and North London.

Home Office Conversion

A dedicated, insulated workspace with electrics, heating, lighting, and data points for productive remote working.

Bedroom Conversion

A warm, comfortable bedroom with en-suite potential. Perfect for growing families or guest accommodation.

Gym & Studio

Reinforced flooring, ventilation, and dedicated power circuits for a home gym or fitness studio.

Playroom / Games Room

A safe, warm space for children or entertainment with soundproofing and durable flooring options.

Self-Contained Annexe

A complete living space with kitchen, bathroom, and sleeping area for elderly relatives or rental income.

Why Us

Why Choose Leeway Brothers for Garage Conversions

Cost Effective

A garage conversion costs significantly less per square metre than an extension — typically 50% less.

Adds Value

A well-converted garage typically adds 10–15% to your property value, more than covering the cost.

No Lost Garden

Unlike an extension, a garage conversion doesn't reduce your garden space.

Quick Build

Most garage conversions are completed in just 2–4 weeks, much faster than a traditional extension.

How we work

Our Process

Garage Conversions from first phone call to handing you the keys, in 6 steps.

  1. 1

    Free Survey & Design

    We assess your garage, discuss your vision, and design a layout that maximises the space.

  2. 2

    Planning & Building Regs

    Most garage conversions don't need planning permission but do need Building Regulations approval. We handle all of this.

  3. 3

    Structural Work

    New front wall or window installed, floor insulated and levelled, damp-proof membrane applied.

  4. 4

    First Fix

    Insulation, stud walls, electrics, plumbing (if needed), and heating installed.

  5. 5

    Second Fix & Finish

    Plastering, flooring, decorating, fixtures, and fittings. Your new room takes its final shape.

  6. Sign-Off & Handover

    Building control sign-off obtained, certificates provided (gas and electrical ones by the registered partner who carried out the work), and your new room is ready to enjoy.

Seen enough?

Have a look at what we have built

All projects
Modern open plan kitchen and living room renovation in Ealing
Ealing

Open Plan Kitchen & Living Space

Luxury bathroom renovation with marble effect tiles in Harrow
Harrow

Marble Effect Bathroom Renovation

Garden pergola with decking and festoon lights in Hemel Hempstead
Hemel Hempstead

Garden Pergola & Entertaining Space

Often booked alongside garage conversions

Open-plan living and dining room created by a rear house extensionHouse ExtensionsLoft conversion with fitted wardrobes and Velux roof windowsLoft Conversions+1 more services
Pricing guide

Garage Conversions Costs

Garage conversion costs depend on the size and intended use:

Single Garage (basic)£8,000–£15,000
Single Garage (high spec)£15,000–£25,000
Double Garage£15,000–£30,000
With En-SuiteAdd £3,000–£6,000
Self-Contained Annexe£25,000–£45,000
£0£45k

Prices are indicative. Your quote will reflect the exact specification and condition of your garage.

Service areas

Garage Conversions across Hertfordshire & London

Every town below is one we have actually worked in. Tap through to see the job and what we cover locally.

Garden pergola with decking and festoon lights in Hemel Hempstead
Our work here

Hemel Hempstead

Garden Pergola & Entertaining Space

Loft bedroom conversion with fitted wardrobes in Watford
Our work here

Watford

Loft Bedroom with Fitted Storage

Navy blue shaker kitchen with Belfast sink in St Albans
Our work here

St Albans

Navy Shaker Kitchen with Belfast Sink

Luxury bathroom renovation with marble effect tiles in Harrow
Our work here

Harrow

Marble Effect Bathroom Renovation

Modern floating staircase with oak and steel in Barnet
Our work here

Barnet

Modern Floating Staircase

Landscaped garden with lawn and patio in Bushey
Our work here

Bushey

Garden Lawn & Patio Landscaping

See every area we cover
Common Questions

Frequently Asked Questions

Common questions about our garage conversions.

Do I need planning permission for a garage conversion?
Most garage conversions fall under Permitted Development and don't need planning permission. However, if your home has specific conditions or is in a conservation area, permission may be needed. We check this for you.
Will I lose parking space?
Yes, you'll lose the garage parking space. Most clients find the extra living space more valuable. You can often create a new parking area on your driveway.
How long does a garage conversion take?
A typical single garage conversion takes 2–4 weeks. More complex projects with en-suites or annexes may take 4–6 weeks.

Ready to Start Your Garage Conversions Project?

Get a free, no-obligation quote for garage conversions in Hertfordshire & London. Our experienced team is ready to help with your project.

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