Does costco sell windows and doors?

Yes, Costco does sell windows and doors through its Costco Next programme, offering bespoke windows and doors from selected trade partners rather than stocking them in warehouses. According to the Energy Saving Trust, replacing single glazing with A-rated double glazing can save a typical semi-detached home around £195 per year on energy bills (Energy Saving Trust, 2026).

The answer depends on whether you need a full supply-and-fit service or just materials. Costco Next connects members with approved installers like Everest and Anglian Home Improvements, who supply and fit windows and doors to your specifications. You cannot walk into a Costco warehouse and pick up a window or door off the shelf, these are made-to-order products. This model works for homeowners wanting a complete package with installation, but not for those looking to buy frames or glass units directly for a DIY project.

Costco Next partners supply and fit the products

Costco Next acts as a referral service, not a direct seller. Members book a free home survey through the Costco website, and the partner company measures, manufactures, and installs the windows or doors. The partnership covers uPVC, aluminium, and composite options, including casement windows, sliding doors, and bi-fold doors. All installations must comply with Building Regulations Part L and FENSA certification (FENSA, 2026). Pricing is set by the partner, but Costco members typically receive a discount of around 10-15% off the retail price.

Costs vary by size, material and number of openings

Typical costs through Costco Next range from £400 to £800 per window installed, including fitting and VAT. A standard uPVC casement window (900mm x 1200mm) with double glazing and installation costs around £550 through the programme. Composite front doors start at approximately £1,200 fitted, while bi-fold door sets (three panels) begin at £2,500. These prices are estimates and depend on your property’s requirements. The TrustMark scheme guarantees that all installers meet government-endorsed quality standards (TrustMark, 2026).

Costco membership is required to access the scheme

You need a valid Costco membership (Trade or Individual) to use Costco Next for windows and doors. The membership costs £33.60 per year for individuals. Without membership, you cannot access the discounted pricing or the referral service. The programme covers England, Wales, and Scotland, with installers operating in most regions. For homeowners seeking a straightforward supply-and-fit service with a known retailer discount, Costco Next offers a reliable route, but it is not a cash-and-carry option for buying windows off the shelf.

A worked example

A typical homeowner replacing single-glazed windows with A-rated double glazing on a 1930s three-bedroom semi-detached house in Manchester can expect to pay around £6,500 for seven windows and a new front door through a Costco Next partner like Everest. After the 10% Costco member discount, the upfront cost drops to approximately £5,850. The Energy Saving Trust estimates annual heating savings of £195 for this home type, rising to £255 if loft insulation is also topped up. Glazing is standard-rated for VAT at 20%. The zero rate for energy-saving materials covers insulation, heat pumps and solar panels; HMRC names secondary and double glazing as excluded (VAT Notice 708/6). Over 25 years, the cumulative savings reach £4,875, giving a payback period of roughly 12 years. The BUS grant does not apply here as it covers heat pumps only, but homeowners on means-tested benefits may qualify for ECO4 funding towards glazing improvements.

What homeowners often get wrong

The most common mistake is assuming Costco sells windows and doors directly in its warehouses. Homeowners often walk in expecting to buy off the shelf and leave disappointed. Here are three frequent misunderstandings.

1. Thinking windows are stocked in-store Many people search the warehouse aisles for window frames. The reality is that Costco Next requires a free home survey and bespoke manufacturing, which takes 4-6 weeks from order to installation.
2. Believing the Costco price is the final cost Some assume the 10-15% member discount applies to the full retail price without checking. In practice, the discount is on the supply-and-fit package, and extras like upgraded handles or coloured frames add £200-£500 to the total.
3. Ignoring FENSA or CERTASS certification Homeowners sometimes choose a non-certified installer to save money. Without a certificate from a Competent Person Scheme, building control approval is needed, which can cost £300-£500 and delay a house sale.

Quick reference

• Costco Next partners like Everest and Anglian supply and fit windows and doors, but you cannot buy them in a warehouse.
• The typical member discount on windows and doors is 10-15% off the retail price from the partner company.
• All installations must comply with Building Regulations and be FENSA or CERTASS certified to avoid extra costs.
• Annual savings from A-rated double glazing in a semi-detached home are around £195 according to the Energy Saving Trust.
• Glazing is standard-rated for VAT at 20%. The zero rate for energy-saving materials covers insulation, heat pumps and solar panels; HMRC names secondary and double glazing as excluded (VAT Notice 708/6).