Trade supply terms · Updated 10 November 2026
These terms cover business purchases of aluminium windows, doors and glazing from Delta Trade Frames. Read them together with your written quotation, specification and order confirmation. Please contact us before ordering if you are buying mainly for personal use; these trade terms do not remove any mandatory consumer rights.
1. About us and contact details
1.1 Delta Trade Frames is a trading name of Dimple Services Limited, registered in England and Wales under company number 02660836. Our registered office is Unit 5, The Argent Centre, Silverdale Road, Hayes, England, UB3 3BS.
1.2 Contact us on 020 8813 7272 or at windows@dimplegroup.com. Written notices may also be sent to our registered office, marked for Delta Trade Frames. References to writing include email.
1.3 We may contact you using the telephone number, email address or postal address supplied with your enquiry or order. Tell us promptly if those details change.
2. Enquiries, quotations and your contract
2.1 The online configurator calculates a full VAT-inclusive product price for eligible collection specifications. Those collection orders are paid in full at checkout. Delivery orders and specifications that are not fully priced online are submitted as quotation requests without payment; displayed estimates for those requests are subject to confirmation. Submitting a request does not reserve stock or authorise manufacture. The separate bespoke project brief builder creates a downloadable brief; saving, printing or downloading it does not send it to us. Email that brief to us for review.
2.2 A contract is formed only when we and you have agreed the final written order confirmation. The quotation, final specification, agreed drawings, order confirmation and these terms together form the contract. An expressly agreed variation in the order confirmation takes priority over these terms.
2.3 Check the company purchasing, quantities, dimensions, system, opening arrangement, handing, finish, glazing, hardware, price, VAT, collection or delivery arrangements and any stated warranty before confirming. Do not authorise manufacture until the information is correct.
3. Products, images and system availability
3.1 Website photographs and illustrations show design inspiration and are not proof of a Delta installation or a technical specification. Screen colours and photographs may differ from the finished product. Where the finish is important, ask about a suitable sample before ordering.
3.2 Product and component availability, including any requested Cortizo system, must be confirmed in the written quotation. A brand or system shown on the website does not by itself confirm availability, certification, suitability or a particular performance level.
3.3 Only the specification and performance information confirmed for your particular system, size and configuration form part of the agreed product description. Do not rely on a general brochure as confirmation that every configuration has the same dimensions, performance or certification.
4. Measurements, specification and installation
4.1 For products made to your measurements, you are responsible for providing accurate and complete dimensions, quantities, drawings, handing and opening details, and for checking the final manufacturing information. Tell us clearly what each dimension represents.
4.2 Unless expressly included in writing, a trade supply order does not include an installation service, structural work, a site survey, removal of existing glazing, disposal, access equipment or making good. Any separate service must be described and priced in the order confirmation.
4.3 You and your appointed installer are responsible for checking site conditions, structural support, access, suitability for the intended use and applicable project requirements. Ask us to clarify system-specific information before authorising production.
4.4 Do not remove existing installations or commit to a fitting date solely on an estimated supply date. Check that the goods have arrived, are complete and match the order before fitting them.
5. Changes to an order
5.1 Contact us promptly if you want to change an order. We will confirm whether the change is possible and any effect on the specification, price or supply date. A change takes effect only when agreed in writing.
5.2 We may propose minor technical changes or changes needed by law. We will explain any change that affects the agreed appearance, performance or price and obtain your agreement before supplying a materially different product.
6. Supply, collection and delivery
6.1 Collection or delivery arrangements, any delivery charge and the estimated supply date will be stated in the quotation or order confirmation. Dates are estimates unless we expressly agree a firm commitment in writing.
6.2 Provide complete delivery instructions and tell us about restricted access, unloading arrangements and any special handling requirements before we confirm delivery. Safe access and any unloading responsibilities must be agreed in advance.
6.3 We will tell you about a delay as soon as reasonably practicable and discuss revised arrangements. If you delay collection or cannot accept an agreed delivery, we will discuss any reasonable additional storage or redelivery costs before they are incurred.
6.4 Risk in the goods passes when they are delivered to the agreed address, or when you or your nominated carrier collect them. Ownership passes when we have received payment in full.
7. Prices and payment
7.1 The agreed price, VAT treatment, deposit, balance payment date and any agreed credit terms will be set out in your written quotation or order confirmation. Fully priced online collection orders require payment of the full displayed VAT-inclusive total at checkout. For delivery and unpriced specifications, online estimates are not a binding quotation: Delta confirms the complete total, including any agreed delivery charge, before sending a secure payment link. The website does not automatically grant a credit account.
7.2 Pay each amount by its agreed due date. We may suspend production or supply if an agreed payment is overdue, after notifying you. Any interest or recovery charges must have a contractual or statutory basis; a payment arrangement for another Dimple business does not automatically apply to Delta.
7.3 If VAT changes before the relevant supply, we will apply the legally applicable rate and explain any resulting adjustment. Tell us promptly if you believe an invoice is incorrect so that it can be investigated.
8. Cancellation and returns
8.1 Contact us in writing if you want to cancel. Products made to a confirmed specification cannot be treated as ordinary stock returns. We will confirm the stage reached and any reasonable, evidenced costs or non-recoverable commitments arising from the cancellation, taking account of costs saved and applicable law.
8.2 Do not return goods without contacting us to agree the arrangements. Cancellation or returns arrangements do not remove rights concerning goods that are defective or do not match the contract.
8.3 Installation cancellation periods or pre-fit survey arrangements offered by Dimple Glazing do not apply automatically to a Delta trade supply order.
9. Inspection, defects and aftercare
9.1 Inspect the packaging and goods on receipt and tell us promptly about missing items, visible damage or a specification discrepancy. Record delivery damage where possible and provide the order reference, photographs and details. A delivery signature does not by itself waive a claim for a concealed defect.
9.2 Do not fit goods with a known defect or discrepancy before discussing it with us. Keep affected goods available for inspection and take reasonable steps to prevent further damage.
9.3 Where goods fail to meet the contract, we will investigate and arrange the appropriate remedy in accordance with the contract and applicable law. Give us reasonable access to inspect the issue or agree a return where required.
9.4 Follow the installation, maintenance and care information applicable to the confirmed product. Damage caused by incorrect installation, misuse, unauthorised alteration or a failure to maintain the goods is not a manufacturing defect.
10. Product warranties
10.1 Any additional manufacturer or Delta warranty, including its duration, scope and conditions, must be confirmed in writing for the product ordered. Ask for the applicable warranty information before confirming your order.
10.2 The installation, PVCu, foiled-product, building-work and conservatory warranties on the Dimple Glazing website are not warranties for Delta aluminium trade supply. No universal aluminium, glazing or hardware warranty period is promised by this website.
10.3 Send warranty enquiries to windows@dimplegroup.com, quoting your order reference and supplying written details and photographs. Any inspection charge must be disclosed and agreed before a chargeable visit. Additional warranties do not replace rights that cannot lawfully be excluded.
11. Responsibility for loss
11.1 Each party is responsible for its breach of the contract in accordance with applicable law. You should take reasonable steps to avoid or reduce loss, including checking the final specification and inspecting goods before installation.
11.2 Nothing in these terms excludes or restricts liability for death or personal injury caused by negligence, fraud or fraudulent misrepresentation, or any other liability that cannot lawfully be excluded or restricted.
11.3 Any proposed financial liability cap or exclusion of business losses must be expressly stated in the agreed order documentation and satisfy applicable legal requirements. No percentage liability cap is created by this website.
12. Ending the contract
12.1 If you do not pay an amount when due, provide essential information or make agreed collection or delivery arrangements, we may notify you in writing and give you a reasonable opportunity to put the issue right. If it remains unresolved, we may suspend supply or end the affected order, subject to applicable law.
12.2 Ending an order does not remove accrued payment obligations or either party’s rights relating to an earlier breach. Any amount retained or charged will take account of the work completed, reasonable costs and applicable law.
13. Other terms
13.1 Changes to these website terms apply to future orders. An existing contract changes only by agreement or where the law requires it. You may not transfer contractual obligations to another person without our written agreement.
13.2 If a term is unenforceable, the remaining terms continue to apply so far as legally possible. A delay in enforcing a right does not waive it. Nothing excludes liability for a statement or right that cannot lawfully be excluded.
13.3 Our Privacy & website data page explains how enquiries and website information are handled. These terms and the contract are governed by English law, with disputes subject to the courts of England and Wales, without restricting any mandatory consumer rights.
Contact Delta Trade Frames if you need clarification before placing an order.