Buying a window or door installation business?

A window or door installation business with a strong forward order book, an established customer referral base, and a skilled installation team is a genuinely fundable acquisition. Customer deposits on signed orders provide a forward revenue visibility that specialist lenders can assess alongside historic trading performance. A well-run installation business with consistent order volumes, recognised accreditations, and a reliable installer team is a more fundable proposition than many buyers expect.

What lenders look at

The forward order book and deposit position are the foundation. Lenders will examine the value of signed orders at the point of acquisition, the deposit percentage collected on each order, and the expected installation and completion schedule. A business with a strong forward order book — ideally covering three to six months of projected revenue — and customer deposits already collected provides the income visibility and cash position that lenders look for. The quality of the order book matters as well as its size — orders with full surveys completed, products specified, and manufacturing instructed are more advanced and more certain than enquiries still at the quoting stage.

FENSA or CERTASS registration is central to the underwriting. Window and door installations that replace thermally controlled elements are notifiable work under Part L of the Building Regulations — the business must be registered with a competent person scheme such as FENSA or CERTASS to self-certify its installations without notifying the local authority. Most mortgage lenders and conveyancers need FENSA or CERTASS certificates on completion of a property sale, making registration a condition of operating effectively in the residential market. Lenders will check registration status as a primary due diligence step — the maintenance of FENSA or CERTASS registration through the ownership change must be confirmed before a funding offer is issued.

Customer acquisition and referral sources are assessed alongside the order book. Window and door installation businesses generate new orders through a mix of channels — showrooms, online enquiries, door-to-door canvassing, and customer referrals. A business with a strong referral rate — existing customers recommending the business to friends, family, and neighbours — demonstrates the installation quality and customer service that drives sustainable order flow. Lenders will want to understand the customer acquisition model and how dependent the order pipeline is on the personal selling activity of the outgoing owner.

Installer retention and CSCS card status are reviewed carefully. Installation businesses are operationally dependent on their fitting teams — experienced window and door installers are difficult to recruit and their departure directly affects both installation capacity and quality. CSCS card holding — the Construction Skills Certification Scheme — is increasingly specified by commercial clients and housing developers. Lenders will want to understand the installer team's stability, their experience and qualifications, and whether key fitters are contracted to stay through the transition.

How we help

We are acquisition finance and loans brokers, not lenders. We package your application, present it to the funders with genuine trade services appetite, and manage the process from first conversation through to completion.

We also arrange government-backed facilities for window and door installation business acquisitions — helping buyers access up to £2 million toward their purchase where the criteria are met.

Every installation business acquisition is different. Tell us about the business. We will take it from there.