Windows, doors & extensions across Essex · Brightlingsea showroom
Compare Alitherm 400, Heritage and Flush aluminium windows with Spectrum Glazing. Local advice, showroom viewing and installation across Colchester and Essex.
A NEW PERSPECTIVE ON YOUR HOME
Contemporary, characterful or beautifully flush. Start with the look you love.
Slim aluminium frames, a generous choice of opening styles and the freedom to make every room your own.
Fine lines and traditional detailing for steel-look windows with a distinctly architectural feel.
An understated exterior, with an opening sash that sits flush within the frame.
Prices shown are illustrative fitted estimates including VAT, based on a 1200 × 1200 mm two-pane window. Not confirmed Spectrum quotations.
Start with the appearance you want, then confirm the right opening arrangement and specification for each room.
| Range | Appearance | A useful starting point for | Illustrative fitted price* |
|---|---|---|---|
| Alitherm 400 | Contemporary casement | Replacement windows and new extensions | From £895 |
| Alitherm Heritage | Slim, stepped steel-look frames | Period-inspired and industrial-style designs | From £1,095 |
| Alitherm Flush | Level external sash within the Alitherm 400 family | Clean elevations and cottage-inspired glazing | From £1,045 |
*Unconfirmed budget examples including VAT for a 1200 × 1200 mm two-pane window. Compare the full assumptions in the visualiser; a measured quotation is required.
For an existing home, look at the whole elevation before deciding how many panes and openers you need. Keeping consistent horizontal lines can help a bay, bedroom and adjoining extension feel coordinated. Inside, a white frame can complement lighter walls even when you choose black or anthracite grey outside.
Bring plans, photographs and approximate sizes to the showroom. We can discuss how window positions relate to furniture, ventilation and access. Use the online designer to compare ideas, then confirm measurements and the installation requirements before ordering.
Explore the details and get an indicative fitted price for your chosen design.
Schematic preview, not a product photograph. Glass appearance, frame proportions, bars and hardware are indicative.
Screen colours are approximate. Special finishes shown as a £125 illustrative allowance; exact finish pricing and availability require confirmation.
Budget estimate only, not a confirmed Spectrum price. Final specification and cost subject to survey.
Enquire about this design ↗Estimates assume one standard-access replacement window, installation, removal of the existing frame and basic making good. Scaffolding, structural alterations, specialist glazing and decoration are excluded. Glass and hardware compatibility must be checked before ordering.
Go bold, blend in, or choose a different finish for each side of your windows.
Textured finishes with a tactile surface. These selected shades offer alternatives to a smooth RAL finish.
Metallic-inspired powder-coated finishes with the character of an anodised appearance.
Soft, traditional shades for cottage and period-inspired designs. Planning approval remains a separate consideration.
Everyday neutrals and deeper architectural colours, including textured options within the wider collection.
Selected colours from Smart’s collections, all selectable in the window visualiser. Swatches approximate colour only, not texture or metallic sheen. View Smart’s complete colour guide ↗
Explore RAL colours alongside Smart’s Sensations textured finishes, Alchemy metallics, Naturals and Cotswold palettes. Ask us about the finishes available for your chosen profiles.
On-screen colours are approximate. View a physical sample before ordering. Special finishes and dual colours can affect lead times and price.
Compare modern lever and traditional-style handles, then choose a finish that suits the frame. We’ll check locking, restrictors, ventilation and escape requirements as part of your specification.
The visualiser shows possible design preferences; not every combination is available on every window.
Explore photography and product details from Smart’s brochures. Select an image to view it larger.
Images © Smart Systems and credited photographers. Brochure photographs are inspiration; some show suitable project types rather than a verified installation of the selected system.
Short, silent brochure image tours. Play here or expand to full screen.
Brochure photo tour · not installation footage
Brochure photo tour · not installation footage
Brochure photo tour · not installation footage
0% finance over 12 months is available on qualifying projects. Talk to us about eligibility and the deposit required for your installation.
Window finance options ↗*Illustration: £3,000 borrowed, 12 payments of £250, £3,000 total loan repayment, £0 interest. Any deposit is additional. Not a credit offer. Finance is subject to status, eligibility and lender terms; confirm current terms with Spectrum.
Spectrum Glazing introduces finance through Ideal4Finance (Ideal Sales Solutions Ltd, a credit broker, not a lender; FRN 703401). Ask for the current finance disclosures before applying.
Smart aluminium windows are available to view at our showroom. Feel the finish, try the handles and talk through the right style for your home with our family-run team.
18 High Street, Brightlingsea
Colchester, Essex CO7 0AE
Visiting for a particular range, colour or handle? Call ahead so we can confirm the displays and samples available.
Replacing one tired window or planning a whole-house transformation? We’ll help you balance appearance, ventilation, privacy and budget.
Alitherm 400 is a versatile contemporary system. Alitherm Heritage is a separate slim steel-look system. Our Alitherm Flush page presents the flush-sash option within Alitherm 400, where the external opening sash sits level with its surrounding frame.
No. They are illustrative budget estimates for the sizes and options shown, including VAT and standard installation assumptions. Spectrum will confirm a price after checking your measurements, access, glazing and specification.
Dual-colour options can be specified. Choose white inside in the visualiser, or ask about other combinations. We’ll confirm availability and any cost difference.
A steel-look appearance does not itself give planning or listed-building approval. Discuss your property with the relevant authority before committing to replacement windows.
Speak to our Brightlingsea team about installations in Colchester, Clacton-on-Sea, Chelmsford, Maldon, Wivenhoe and surrounding Essex towns and villages.
Our Brightlingsea showroom is a place to compare Smart windows in person before deciding on your home. We discuss projects in Colchester, Clacton-on-Sea, Chelmsford, Maldon, Wivenhoe and the surrounding Essex area.
For exposed or coastal homes, tell us about the location so the finish, hardware and care requirements can be considered in the specification. Call 01206 258056 to discuss your property and the displays available.
Visit our Brightlingsea window showroom ↗Considering alternatives? Compare Spectrum’s aluminium window ranges.
Tell us a little about your project and include your window design. We’ll help you take the next step towards a measured quotation.
01206 258056
sales@spectrumglazing.co.uk
This form prepares an email in your own email app. Nothing is sent until you send that email.
