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LEEWAYBROTHERS
Loft conversion with fitted wardrobes and Velux roof windows
Professional Loft Conversions

Loft Conversions in Hertfordshire

Transform your unused loft into a stunning new bedroom, home office, or living space. As Hertfordshire's trusted loft conversion specialists, we've helped hundreds of homeowners add valuable space to their properties since 2015. Our Gas Safe and NICEIC certified team handles everything from design to completion.

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What We Offer

Our Loft Conversions

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

Dormer Loft Conversion

The most popular option. A dormer extension projects from the roof slope, creating full standing headroom and maximising usable floor space.

Hip-to-Gable Conversion

Ideal for semi-detached and detached homes. We extend the hip roof to create a vertical gable wall, significantly increasing loft space.

Velux / Rooflight Conversion

The most cost-effective option. We install Velux windows into the existing roof structure without altering its shape. Perfect when headroom allows.

Mansard Loft Conversion

The premium option that replaces one or both roof slopes with near-vertical walls and a flat roof. Offers maximum space but typically requires planning permission.

L-Shaped Loft Conversion

Designed for Victorian terraced houses with rear outriggers. Two dormers create an L-shaped living space, ideal for a bedroom plus en-suite.

Why Us

Why Choose Leeway Brothers for Loft Conversions

Full Design & Build

We handle architectural drawings, structural calculations, party wall agreements, and building regulations — so you don't have to.

Certified Tradesmen

Gas Safe registered plumbers for radiator work, NICEIC certified electricians for all wiring. Every trade covered in-house.

Turnkey Finish

From steelwork to plastering, plumbing to decoration — we deliver a fully finished room ready to use.

Building Control Approved

We manage all building control inspections and issue a completion certificate when your conversion is signed off.

How we work

Our Process

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

  1. 1

    Free Survey & Quote

    We visit your property, assess the loft space, discuss your ideas, and provide a detailed, no-obligation quote.

  2. 2

    Design & Planning

    Our architectural partners prepare drawings. We handle planning permission (if required) and party wall notices.

  3. 3

    Structural Work

    Steel beams installed, floor strengthened, dormer or roof structure built. This is where your loft starts taking shape.

  4. 4

    First Fix

    Stud walls, insulation, plumbing, electrics, and staircase fitted. All first-fix trades completed.

  5. 5

    Second Fix & Finish

    Plastering, bathroom fitting, flooring, painting, and final decoration. Building control sign-off obtained.

  6. Handover

    We walk you through the finished space, hand over certificates, and ensure you're completely satisfied.

Seen enough?

Have a look at what we have built

All projects
Loft bedroom conversion with fitted wardrobes in Watford
Watford

Loft Bedroom with Fitted Storage

Loft conversion with Velux windows and fitted wardrobes in Hounslow
Hounslow

Velux Loft Conversion

Often booked alongside loft conversions

Open-plan living and dining room created by a rear house extensionHouse ExtensionsPlumber fitting pipework beneath a kitchen sinkPlumbing+2 more services
Pricing guide

Loft Conversions Costs

Loft conversion costs in Hertfordshire depend on the type of conversion, your property, and finish level. Here are typical price ranges:

Velux / Rooflight Conversion£25,000 – £35,000
Dormer Loft Conversion£35,000 – £55,000
Hip-to-Gable Conversion£45,000 – £65,000
Mansard Loft Conversion£55,000 – £75,000
L-Shaped Conversion£50,000 – £70,000
£0£75k

Prices shown are estimates only. Final costs depend on individual project requirements. Contact us for a detailed, no-obligation quote.

Service areas

Loft 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.

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

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

Hemel Hempstead

Garden Pergola & Entertaining Space

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

Modern open plan kitchen and living room renovation in Ealing
Our work here

Ealing

Open Plan Kitchen & Living Space

See every area we cover
Common Questions

Frequently Asked Questions

Common questions about our loft conversions.

How much does a loft conversion cost in Hertfordshire?
Loft conversions in Hertfordshire typically cost between £25,000 and £75,000 depending on the type. Velux conversions start around £25,000, dormer conversions from £35,000, and hip-to-gable or mansard conversions from £45,000–£55,000. Contact us for a free, accurate quote.
Do I need planning permission for a loft conversion?
Most loft conversions fall under Permitted Development and don't require planning permission. However, you may need permission if your property is in a conservation area, is a listed building, or the conversion exceeds certain volume limits. We assess this during your free survey.
How long does a loft conversion take?
A typical loft conversion takes 8–12 weeks from start to completion. Velux conversions may be quicker (6–8 weeks), while more complex mansard or L-shaped conversions can take 10–14 weeks. We provide a detailed timeline with your quote.
Will a loft conversion add value to my home?
Yes, a well-executed loft conversion typically adds 15–20% to your property value. In Hertfordshire, where property prices are higher, this can represent a significant return on investment. An extra bedroom with en-suite is the most sought-after configuration.
Can I stay in my home during the loft conversion?
Yes, most of our clients stay in their homes throughout the conversion. The majority of work happens above your existing living space. We minimise disruption and keep the site clean and tidy at all times.

Ready to Start Your Loft Conversions Project?

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

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