Hands applying render with a trowel and hawk

Brands we install

Choose by look and budget first — brand second.

Every window and door we sell sits in one of four tiers. The quote builder shows them side by side, so you can see exactly what more money buys.

Compare tiers in the quote builder Browse products

Four tiers

What each tier gives you

Each tier is priced against the Value (uPVC) baseline. Example: sliding patio doors, 3 m, installed, as at 11 October 2026.

Value

REHAU uPVC

Look: White, grey, anthracite and woodgrain foils
Why choose it: A-rated double glazing, up to 20-year guarantee

Baseline price

£2,200–£3,800

Price in Value

Contemporary

SMART or AluK aluminium

Look: Slim aluminium, any RAL colour, dual colour
Why choose it: Strong, slim sightlines, heritage options

1.6–1.9× the uPVC price

£5,000–£8,500

Price in Contemporary

Engineered

Schüco aluminium

Look: Large spans, triple glazing, acoustic
Why choose it: Best thermal and acoustic performance

2–2.4× the uPVC price

£6,500–£10,500

Price in Engineered

Signature slimline

Cortizo Cor Vision

Look: Minimal 20–30 mm frames, floor-to-ceiling
Why choose it: The architectural, frameless look

2.4–3× the uPVC price

£8,500–£14,000

Price in Signature

Glazing brands

Aluminium windows and doors

Three tiers of aluminium, from slim contemporary frames to near-frameless slimline glazing.

ContemporaryAluminium, British

SMART Systems

Heritage, period and conservation-area homes; mid-range contemporary

About SMART Systems

ContemporaryAluminium, British-supplied

AluK

Contemporary homes, short lead times

About AluK

EngineeredAluminium, German

Schüco

High-spec, triple glazing, Passivhaus-grade, large spans

About Schüco

Signature slimlineAluminium, Spanish

Cortizo

Signature minimal-frame glazing for architect-led projects

About Cortizo

Glazing brands

uPVC and composite

The best-value way to A-rated windows, plus composite front and back doors.

ValueuPVC, German

REHAU

Best-value energy-efficient replacement windows

About REHAU

GRP composite

Composite doors

Front and back doors

About Composite doors

Glazing brands

Roof windows and rooflights

Chosen by brand rather than tier: pitched roof windows and bespoke flat rooflights.

Roof windows

VELUX

Loft conversions and pitched roofs (LINX standard spec)

About VELUX

Roof windows

FAKRO

Value alternative to VELUX

About FAKRO

Rooflights, British

Cambridge Skylights

Extensions, terraces, non-standard sizes

About Cambridge Skylights

Beyond glazing

Renewables and insulation makes

These don't have brand pages — we choose the right make for your home at survey.

Renewables

The makes we install for heating, cooling and storage. We recommend one at survey based on your home.

Renewables

Heat pumps

Air and ground source heat pumps

Vaillant
Worcester Bosch
Mitsubishi Electric
Daikin
Samsung
Panasonic
LG
Grant

HVAC

Air conditioning

Single-room and multi-split systems

Daikin
Mitsubishi Electric
Panasonic
Fujitsu
LG

Storage

Batteries

Home battery storage with or without solar

Tesla
GivEnergy

Insulation and façades

Materials and systems used by our insulation division, specified by service.

Fabric

Insulation

Full list by service in the insulation division

Knauf Insulation (Earthwool, Supafil blown)
Rockwool
Superglass
Isover
Kingspan
Celotex
Recticel
Xtratherm
Steico wood-fibre
YBS and Actis multifoil

Façade

EWI and render

Insurance-backed EWI usually requires approved-installer status with the system holder

Sto
Weber
K Rend
Wetherby
Parex

Specialist

Spray foam

Selected roofs after an independent suitability assessment

A third-party certified (BBA or KIWA) open-cell system only

Begin your project

See every tier priced for your home

Pick your product and compare REHAU, SMART, AluK, Schüco and Cortizo side by side. A survey always confirms the final figure.

Start my instant quote Book a survey 020 8914 7824