Alitherm 400 Casement
Side hung, top hung, fixed, tilt & turn and flush casement options — all thermally broken, all PAS 24:2022 approved.
The details, at your pace
Products for a better home.
Explore the systems we offer. Performance, security options and guarantees depend on the product and specification; we’ll confirm what applies in your written quote. Supplier photographs show product examples, not L&P installations.
Not sure where to start? Book a free survey →
Liniar EnergyPlus · 70mm
uPVC Windows · Liniar System
The Liniar EnergyPlus profile.
We build our uPVC windows on Liniar's market-leading EnergyPlus system — a British-made, six-chamber 70mm profile engineered to out-perform ordinary uPVC on warmth, strength and looks.
A++ energy rated6 symmetrical chambers100% lead-freeSecured by Design
- ◆Outstanding thermal efficiency. Six insulating chambers can reach U-values as low as 1.2 W/m²K double-glazed — A-rated warmth without paying for triple glazing.
- ◆Patented bubble gasket. Liniar's co-extruded double-action seal hugs every corner of the frame, so your windows stay genuinely draught and leak free.
- ◆Chamfered or sculptured. Choose crisp, contemporary chamfered frames or softer ovolo sculptured profiles to suit period and modern homes alike.
- ◆Casement, flush sash & tilt-and-turn. Add mock sash horns, astragal or Georgian bars, woodgrain foils and dual colours for a perfect match.
- ◆Built-in security. Multi-point locking as standard, with PAS 24 and Secured by Design options for total peace of mind.
Liniar · Real-world case study
An energy efficient ideal home — real results.
A supplier case study from Derbyshire: a home fitted with Liniar EnergyPlus windows by Rooms & Views. This is not an L&P Windows installation.
BEPC energy rating achieved
A++Window energy rating
6Insulating chambers
100%Liniar-approved fabrication
Liniar reports that the EnergyPlus windows and the home’s energy performance were important factors in the homeowners’ decision to buy.
Summary of Liniar’s supplier case study — Derbyshire
The home achieved a B energy performance certificate (EPC) rating, with the Liniar windows and high-performance glazing earning the highest possible “very good (most efficient)” score — rare for a standard new build.
Condensation formed on the outside of the glass — a sign the windows are working exactly as designed, keeping the inside warm and dry while the outer pane stays cold.
The south-facing French doors open the home to the garden while the EnergyPlus insulation keeps the interior comfortable in both summer heat and winter cold — reducing energy bills year round.
Project by Rooms & Views, Liniar Approved fabricator-installer. Products: 70mm EnergyPlus casement & bay windows, French door.
Smart Systems · Alitherm 400 · PAS 24:2022
Aluminium · Smart Architectural Systems
Smart aluminium.
Slim frames, more glass.
We install Smart's Alitherm 400 system — a British-made thermally broken aluminium range combining outstanding value, class-leading thermal performance (U-value 1.4 W/m²K, WER Band A+) and PAS 24:2022 security approval across windows and doors.
Visofold 1000
Slim-line folding doors that stack flush and open your living space right onto the garden.
Visoglide Plus
Inline and lift-and-slide patio doors with unbroken views and U-values to 1.4 W/m²K.
Alitherm 400 Doors
Single or double, open-in or open-out. PAS 24:2022 approved with multi-point locking as standard.
Smart Lantern · Aluminium · Thermally Broken
Roof Lanterns · Smart Systems
Bring the sky indoors.
The Smart Lantern is the latest innovation from Smart Systems — engineered for contemporary aesthetics and intelligent performance. Narrow sightlines and fully concealed fixings deliver maximum visual impact for modern living spaces and light-filled extensions.
Narrow sightlinesThermally brokenDual colour28.8mm laminate glazing
- ◆Tap-down top capping. Designed for ease of fabrication with fully concealed fixings for a clean, minimal roofline.
- ◆Co-extruded gasket isolators. Aluminium polyamide construction with thermally broken profiles to keep heat firmly inside.
- ◆Made to your dimensions. Up to 2000mm wide and 4500mm long at a fixed 25° pitch — colour-matched inside and out.
- ◆28.8mm laminate glazing. High-performance glazing as standard, with optional self-cleaning and solar-control coatings.
Future Products · Composite
Composite Doors · Future Products
A front door that means it.
We fit Future Products composite doors in both of their ranges, so you get the right balance of value, strength and security — available in a wide range of colours, with decorative glass and matching hardware.
GRP Composite
A foam-filled core with a tough glass-reinforced-plastic skin that won't fade, peel or warp — superb thermal value and a smooth or grained finish.
Solid Core
A multi-layer hardwood slab for maximum strength and security, with Secured by Design and FD30 fire-rated options available.
- ◆Built to keep you safe. High-security cylinders and multi-point locking, with Secured by Design specification available.
- ◆Warm and weather-tight. Excellent U-values and robust weather seals keep the hallway cosy and the draughts out.
- ◆Endless colours. Single or dual foil colours and a wide glass range to match your home's character.
Acoustic Laminate · Secondary Glazing
Acoustic Glazing · Peace & Quiet
Shut out the noise.
Whether you're on a busy road, near a railway or under a flight path, L&P Windows can significantly reduce the noise entering your home — without changing the look of your windows.
Acoustic laminate glassSecondary glazingSpecification-led advice
- ◆Acoustic laminate glazing. A specialist PVB interlayer between glass panes dampens sound waves before they reach the inside — far more effective than standard double glazing.
- ◆Secondary glazing. A discreet inner window fitted behind your existing frame creates an independent air gap that's exceptionally effective at blocking low-frequency traffic and rail noise.
- ◆Keep your existing windows. Secondary glazing can often be installed behind existing frames. Listed-building, planning and landlord permissions must be checked where relevant.
- ◆Thermal bonus. As well as quieting your home, acoustic secondary glazing dramatically improves thermal performance and reduces draughts through older frames.
Liniar · uPVC Conservatories
A room you'll use
all year round.
Each Liniar conservatory is beautifully designed to your own individual style — matching windows, doors and a glazed roof in a wide choice of shapes, colours and finishes.
Six shapes & styles.
Every conservatory is built to your bespoke design. Browse the shapes below to find the best fit for your home and garden.
Lean-To
Simple and versatile — ideal for bungalows, porches and homes with limited eaves space. The pitch can vary to suit your property.
Gable End
A traditional apex roof with a fully glazed front elevation — creating the dramatic 'sunburst effect' inside and out.
Double-Hipped
Pitched roofs on both sides flood the space with natural daylight. Pairs beautifully with bi-fold doors for maximum impact.
Combination
Two glazed roof shapes united — P-shaped or T-shaped — to maximise your garden space and create a truly bespoke room.
Edwardian
A square or rectangular shape that maximises usable floor space and is easiest to furnish — no wasted corners.
Victorian
Multi-faceted curves add traditional elegance to any home — from large gardens to small patios. One of the most popular styles.
Built to perform & last.
- ◆Aluminium frame, uPVC top caps. Roofs combine an aluminium construction with EnergyPlus uPVC exterior caps for slim sightlines and superior thermal efficiency.
- ◆Perfectly matching windows & doors. All glazing uses Liniar's EnergyPlus 70mm system — colours, profiles and hardware match throughout.
- ◆Wide glazing choice. Select from standard double-glazed, solar control, self-cleaning and acoustic laminate glass options.
- ◆Kit format for seamless installation. The Liniar roof system ships as a complete kit with all components included — ensuring a clean, fast fit.
- ◆Fully recyclable PVCu. 100% recyclable uPVC profiles, lead-free and manufactured sustainably in Liniar's UK facility.
- ◆Bespoke to your home. Every conservatory is made to measure — choose your shape, colour, door style and glazing specification.
Available colours.
Colour-matched to your windows and doors throughout — inside and out.
White
Cream
Rosewood
Chartwell Green
Irish Oak
Golden Oak
Anthracite Grey
Black Brown
Perfectly matched
Every Liniar conservatory uses the same EnergyPlus uPVC system as our windows and doors — so every frame, colour and hardware detail is perfectly coordinated across your entire home.
Liniar Spaces · Garden Rooms
Your garden,
reimagined.
Versatile, comfortable and fully customisable — Liniar Spaces garden rooms blur the line between indoor and outdoor living, adding real value and year-round usable space to your home.
Work space
A tranquil home office away from distractions — separate from your main living areas.
Fun space
Host gatherings and entertain friends and family in a comfortable, dedicated space.
Healthy space
Bring the gym home — exercise confidently in comfort and privacy, any time you like.
Quiet space
A serene sanctuary with soft lighting and calming decor for mindfulness or reading.
Built to last and impress.
- ◆Planning checks come first. Whether permission is needed depends on the property, location, dimensions and intended use. Confirm the relevant requirements before ordering.
- ◆Weather tested to extremes. Rigorously tested against hurricane-force winds, violent rainstorms and heavy snow loading.
- ◆Fully customisable. Choose your size, colour, window style and door type — including uPVC bi-fold and casement options.
- ◆Solar Shield foil colours. Premium foiled wall panels resist fading with built-in UV protection, scratch and abrasion resistance.
- ◆Energy efficient glazing. Liniar's multi-chambered profiles keep your garden room comfortable year-round, hot or cold.
- ◆High-security locking. Liniar windows and doors feature multi-point locking mechanisms as standard throughout.
Technical specifications.
Overall Height2.46m
Max Width5.9m
Max Depth4.4m
Wall FinishFoil-wrapped uPVC
FrameworkPowder-coated aluminium
RoofEPDM rubber
Fully customisable
Choose your dimensions, colour, window style and door type. Liniar's design visualiser lets you see your garden room before it's built — ask us about options when you book your survey.
Liniar · uPVC Roofline
A fresh roofline,
zero maintenance.
Made from Liniar uPVC, with colour-matched options and a low-maintenance finish. We’ll confirm the suitable specification and guarantee terms with your quote.
Built better for installers.
- ◆20mm thick fascia boards. 4mm thicker than the industry standard 16mm — significantly stronger and flatter for a perfect finish.
- ◆Pre-marked protective tape. Pin guides at 100mm centres and lines at 25mm intervals speed up fitting and eliminate pre-marking.
- ◆Consistent board thickness. Extruded with the latest technology ensuring uniform thickness and improved flatness throughout.
- ◆Fire resistant. Fascia and flat boards certified Class 1Y; hollow soffit boards certified Class 2Y.
- ◆Factory-fitted foil colours. Colours applied in-house at Liniar's UK facility — guaranteed to match windows, doors and roofs.
- ◆Guarantee information. We’ll confirm the product and installation cover for your chosen roofline specification in writing.
Available colours.
All foil colours are factory-fitted in-house — matching Liniar windows and doors perfectly.
White
Cream
Rosewood
Chartwell Green
Irish Oak
Golden Oak
Anthracite Grey
Black Brown
Under one roof
Liniar soffits and fascias are manufactured at the same UK facility as their windows and doors — ensuring every profile, colour and foil finish is perfectly coordinated across your entire home.
Glass repair & replacement
Broken or misted?
We'll sort it.
From a single misted pane to a full sealed unit upgrade, our glaziers cover all of Gloucestershire — fast, tidy and fairly priced.
Misted unit replacement
Failed sealed units cause condensation between the panes. We replace just the glass — not the whole frame — saving you time and money.
Broken glass replacement
Single pane, double or triple glazed units replaced quickly, using safety glass where required. Most jobs completed within a few days.
Sealed unit upgrades
Swap out old single or standard double-glazed units for high-performance or acoustic laminate glass without changing your existing frames.
Emergency boarding
Broken window overnight? We can board up and make safe the same day, then return to fit new glass as soon as it arrives.
Free survey & quote
Let's get started.
Tell us what you're planning and we'll arrange a free, no-obligation survey anywhere in Gloucestershire — or pop into our shop and see Liniar, Smart and Future products in person.