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Modern single-storey modular extension with a tiled warm roof and anthracite bifold doors open onto a landscaped patio, built by Rex Glass and Glazing
Modular Extensions · Kent & Essex · Hornchurch

Modular Extensions in Hornchurch

Design and build specialists. Extra living space, built fast and clean, with far less disruption than a traditional brick build.

Get a Quote Call 01708 289006
The basics

What is a modular extension? in Hornchurch

A modular extension is built from large, pre-engineered panels rather than laying every brick and block on site. Each panel is made off site to your exact project, then assembled straight onto prepared foundations.

The result is the same solid, insulated, Building Regulations compliant room, built through a smarter, faster and far tidier process. As a hup! Approved installer, we design, manufacture and install across Kent & Essex.

Engineered off site, assembled on your foundations
Watertight in around two days
Fully Building Regulations compliant
Get a free modular extension quote today
Aerial view of a completed modular extension with an anthracite glazed lantern roof set against a brick home and garden
2 days
Watertight, so internal work can start almost immediately.
Types of extension

Shaped around your home

From a single room addition to a full-width rebuild, every extension is designed and manufactured specifically for your home, never adapted from a standard template.

Bright open-plan kitchen extension with a large island, roof lantern and wraparound bifold doors opening onto the garden
Most popular

Kitchen extensions

A bigger, brighter space for cooking, dining and entertaining, with room for an island and a proper family dining table.

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Roof styles & finishes

Four roof systems, finished to suit your property

Modular extension with a tiled warm roof and bifold doors

Tiled roof

A lightweight tiled finish in Carbon Grey, Harvest Brown or Terra Brick, engineered for spans up to 4 metres.

Conservatory extension with a fully glazed blue-tinted glass roof and white frames onto a paved patio

Glass roof

A fully glazed system with adjustable pitches and a wide choice of glazing options.

Hybrid roof modular extension with a solid insulated roof and a glazed lantern

Hybrid roof

A solid, insulated roof with glass panels built in wherever you want extra light.

Flat-roof modular extension with a glazed lantern and sliding doors

Flat roof

Spans up to 5.6 metres above bifold doors with no extra structural support, ideal for opening onto the garden.

Wall finishes

Walls can be finished in brick, brick mesh, timber, render or cladding, so the exterior matches the rest of your home.

Brick and brick-mesh finish colour options in charcoal, buff white, red and brown

Brick & brick mesh

A range of brick tones, from charcoal and buff through to classic reds and browns, to blend with your home.

Cladding and render finish options in natural timber, grey and cream

Timber, cladding & render

Natural timber, contemporary grey cladding or a smooth cream render for a softer, modern finish.

Cutaway 3D render of a modular extension showing the insulated panel walls, breather membrane, steel frame and flat roof build-up
Included as standard

Everything that makes it a proper room

No hidden extras or surprise upgrades. Every modular extension we build comes with the full specification as standard.

Fully insulated, ventilated wall system
A1 fire-rated fireboards
Your choice of tiled, glass, hybrid or flat roof
Brick, timber, render or cladding finish
Energy-efficient glazing, doors and rooflights
Building Regulations sign-off handled for you
Installed by our own team, never subcontractors
10-year insurance-backed guarantee
See it in action

How a modular extension goes together

A short explainer on the modular build system, from engineered panels to a finished, insulated room.

How it works

From survey to finished extension

The same clear stages as any project we handle, just faster, because so much of the build happens off site.

01

Free survey

We visit your home, discuss your requirements and assess planning.

02

Design & fixed quote

A design suited to your home, with a clear, itemised quote.

03

Offsite manufacture

Panels are engineered to your exact specifications while groundworks are prepared.

04

Installation

Panels are assembled on site, considerably faster than a brick build.

05

Sign off & guarantee

Signed off to full Building Regulations standards and backed by our guarantees.

01Free survey

We visit your home, discuss your requirements and assess planning.

02Design & fixed quote

A design suited to your home, with a clear, itemised quote.

03Offsite manufacture

Panels are engineered to your exact specifications while groundworks are prepared.

04Installation

Panels are assembled on site, considerably faster than a brick build.

05Sign off & guarantee

Signed off to full Building Regulations standards and backed by our guarantees.

Do you need planning permission?

Many single-storey extensions can be built under permitted development rights, so full planning permission may not be required. We assess your specific project against current planning rules during your survey, and handle the paperwork if an application is needed.

Book a free site visit

A free, no-obligation quote from our specialist team across Kent & Essex.

Get a Quote 01708 289006
The difference

Modular vs a traditional brick build

The same finished room, reached through a smarter, faster and far tidier process.

The Rex modular way
Up to 5× faster to build
Watertight in around two days
Minimal mess and far less time on site
Built off site, unaffected by the weather
Fixed, itemised quote from the start
10-year insurance-backed guarantee
A traditional brick build
Weeks, often months, on site
Watertight only once fully roofed
Skips, scaffolding and dust for longer
Progress stalls in bad weather
Costs can creep as work drags on
Guarantees vary by builder
Why modular

The advantages over a traditional brick build

A shorter build time

Panels are manufactured off site while groundworks happen in parallel, so your project moves considerably faster.

Less disruption at home

Fewer weeks of scaffolding, noise and mess, and in many cases a lower overall cost thanks to a faster build.

Watertight in two days

A breathable membrane makes the structure watertight within two days, so internal work can start almost immediately.

Built to last

Ventilated wall construction and A1-rated fireboards, built to a standard that is BBA approved for a 60-year lifespan.

Faster to build
Than a traditional brick build
0
Days to watertight
So internal work starts fast
0 yr
BBA-approved lifespan
Ventilated walls, A1 fireboards
0 yr
Guarantee
Plus a 10-year manufacturer's warranty
Recent work

Modular extensions we've built

View the gallery
Homeowner reviews

Trusted by families across Kent & Essex

Our partners

A hup! Approved installer, FENSA registered and independently reviewed

hup! Approved InstallerFENSA Registered CompanyGQA QualificationsUltraframeTrustATrader Approved Business
Common questions

Modular extension FAQs in Hornchurch

Do I need planning permission for a modular extension?

Many single-storey extensions fall under permitted development, so full planning permission may not be required. It depends on size, height and how close it comes to a boundary. We assess your project against current rules at survey and handle any application needed.

How long does a modular extension take?

Because panels are engineered off site while groundworks happen in parallel, most homeowners see a noticeably shorter gap between survey and finished room than with a traditional build. The structure is typically watertight within two days of assembly.

Is a modular extension cheaper than a brick build?

In many cases, yes. A faster build means less labour, fewer site facilities and less time in temporary living arrangements. Your written quote itemises everything, so you can see exactly what you are paying for.

Is it as strong and warm as a traditional extension?

Yes. You get the same solid, insulated, Building Regulations compliant space you would from a brick extension. Ventilated wall construction and A1-rated fireboards are built to a standard that is BBA approved for a 60-year lifespan.

What guarantees come with the work?

Every extension is backed by a 10-year manufacturer's warranty alongside a 10-year insurance-backed guarantee, with a 5-year warranty on glass components. We're also a family-owned team with over 25 years of combined experience.

Looking for more answers? Browse our full knowledge base of FAQs →

Start your project

Get your free quote today

Whether you're picturing a new kitchen, a garden room or a full rear extension, we'd love to help. No pressure, no hard sell, just honest advice.

Get a Quote01708 289006WhatsApp

Looking for a service other than Modular Extensions in Hornchurch?

We provide a whole range of glazing options for our Hornchurch clients:

Conservatory Warm RoofsUPVC Double Glazed WindowsTriple Glazing WindowsBifold DoorsComposite DoorsSliding Patio Doors

Not in Hornchurch? Still looking for Modular Extensions near you?

We cover Kent, Essex and the London boroughs between them:

Modular Extensions in MaidstoneModular Extensions in TonbridgeModular Extensions in BrentwoodModular Extensions in CanterburyModular Extensions in GraysModular Extensions in Royal Tunbridge WellsModular Extensions in TenterdenModular Extensions in Romford

We also install modular extensions in North Ockendon, Herongate, Aveley, Purfleet and Creekmouth.

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