Listed building slim double glazed units

Glazing Quick Quote – TRADE ONLY

It’s quick and easy to use and is guaranteed to speed up your standard orders and quotes. We are now producing toughened glass for our own units down to a size of 120mm x 120mm. For all standard orders we aim to get back to you with a quote within 4 hours and for all orders within 1 business day.

Please be aware the Warranty is only valid where installed by a professional trades person.

Payment for non-account customers in full is required at the time of order confirmation for all purchases under £500.

For information on Slenderpane’s glazing guidelines, warranty and our Quick Quote Form please download our Information Pack .

Just click on the fields to input your specification. (We have included advice and tips to help with your selection).

For any special glass units that you require, please give us a call:

Acoustic Glass
Leaded Glass
Restoration Glass
Laminated Glass
Obscure Glass
Self Clean Glass
Solar Control Glass
Low Iron Glass
Please complete the form as carefully as possible so that we can respond quickly.

    (This is the make up e.g. 4/4/4: inner and outer pane 4mm, no low E spacer 4mm giving overall thickness of 12mm.)
    10mm Can't be toughened. Can't have low "E" glass so very poor "U" value. NOT RECOMMENDED
    11mm - Can only be toughened one side.
    14mm - RECOMMENDED


    Glass Type
    KA Low E - Good "U" value. RECOMMENDED
    Softcoat Low E - Good "U" value but renowned for toughened imperfections. NOT RECOMMENDED.

    KA Low ESoftcoat Low ENo Low E

    Spacer Colour
    (Black/White - 6,7,8,9 & 11mm / Grey Spacer (only 9 & 11 mm).
    Black is RECOMMENDED
    White is more expensive.


    (What you see on the face of the unit, where the glass sits on the rebate. Rebate needs to be 1.5mm larger that the sightline.)
    6mm - One year guarantee on toughened. White more expensive.
    6mm - 3 year guarantee on annealed. White more expensive.
    7mm - 10 year guarantee on annealed and toughened. Black recommended. White more expensive.
    9mm - 10 year guarantee on annealed and toughened. Less expensive version of white.
    11mm - 10 year guarantee on annealed and toughened.

    6 Toughened6 Annealed7911Other

    Argon Gas - Will give a very poor "U" value in a slim unit. NOT RECOMMENDED. OK for thicker units 20mm+
    Krypton Gas - Good "U" value and economic RECOMMENDED
    No Gas - Will give very poor "U" value. NOT RECOMMENDED

    KryptonArgonNo Gas

    Toughened Glass
    Toughened glass is more expensive than annealed and, due to the toughening process is renowned for problems of warping, scratches and imperfections. The delivery period for toughened is longer than for annealed units.

    SAFETY MARKINGS - Toughened units require safety makings. This can be a KITE MARK which is placed in a corner, not necessarily the same corner or a LINE LOGO which runs along the edge and is hardly visible. We can also provide a certificate.

    It is well worth only ordering toughened strictly when it is needed to reduce costs. (Please give us a call for guidance).

    ToughenedNon Toughened

    Delivery or Collection
    For 24kg and under delivery is £40.


    For non-account customers payment of the deposit is required prior to production. Payment details will be issued on your quote. Please include Quote Number when making payment, if possible.

    Slenderpane logos

    Social Media

    Opening Hours

    Monday - Thursday: 8.30am - 5.00pm
    Friday: 8.30am - 4.00pm
    Saturday, Sunday & Bank Holidays: Closed

    Slenderpane's Workshop Showroom visits for Trader customers are by appointment only.

    We are proud to be sponsors of the Florence Nightingale Hospice Charity

    Florence Nightingale Hospice Charity

    Contact Form