How To Offer Finance For Basement Conversions

What customer finance really adds to a basement-conversion business

Customer finance lets you present a basement conversion as a manageable monthly cost rather than a single large invoice. In practice, it means a regulated lender pays you (or your supplier chain) and the customer repays over an agreed term, subject to status and affordability checks. For your business, finance can reduce “let me think about it” delays, protect cash flow, and help you confidently quote complete projects that include design, compliance and finishes. It also supports more consistent pipeline planning, because customers can make decisions based on budget certainty rather than timing their savings.

Why homeowners fund basement projects rather than pay upfront

Basement conversions sit in an awkward middle ground: often more cost-effective than moving or building out, but still a significant capital outlay. UK cost guides commonly place conversion costs around £750 to £3,000 per square metre, with high-end London excavations and premium fit-outs potentially exceeding £3,000 to £4,500 per square metre once structural work, waterproofing and finishes are included. Many total project budgets land in the £80,000 to £200,000 range, which is beyond what most households keep in readily available cash. On top of build costs, professional fees can be material, with architects frequently around 10 to 12% of construction costs and other specialists adding further cost, often paid in stages.

How finance helps you win work and protect margin

Offering finance can increase sales by removing the need for customers to compromise on scope. Instead of downgrading the specification or shelving the project, customers can choose a term that fits their monthly budget and proceed with a more complete design. It can also reduce discount pressure: when the conversation shifts from “Can you take £10,000 off?” to “What would this look like per month?”, you can defend quality and programme. For higher-value projects, finance can help you secure earlier commitment, which supports scheduling and procurement. The net effect is often higher conversion rates, larger average order values, and steadier cash flow.

Understanding affordability is not just about the rate. It is about what the customer can comfortably repay month to month.

Typical transaction values in the UK basement-conversion market

What you can put on finance

1. Structural works (underpinning, steelwork, drainage adjustments)

2. Waterproofing and tanking systems

3. Electrical, plumbing and heating upgrades (including underfloor heating)

4. Staircases, light wells and glazing

5. Ventilation and fire-safety improvements required for compliance

6. Fit-out and finishes (joinery, flooring, kitchens, bathrooms)

7. Professional services (architect, structural engineer, surveying where applicable)

8. Planning application and building-control related costs

FCA and compliance essentials in plain English

If you introduce finance, your business must handle promotions and customer communications carefully. Claims should be clear, fair and not misleading, and you should avoid implying approval is guaranteed. Present key information consistently, including the fact that finance is subject to status and affordability and that terms and rates may vary. Customer data must be collected and shared securely, with privacy information provided at the right time. Your staff should know when to signpost the lender’s explanations and when to pause if a customer shows vulnerability.

How introducer and broker models fit together

In an introducer model, you refer customers to a finance provider and your role is to introduce, not to advise on which regulated credit product they should take. The lender (or a broker acting as an intermediary) manages the application, underwriting and regulated disclosures. This structure suits basement conversion firms because it keeps your process focused on design, specification and delivery while still allowing customers to access suitable finance routes. Depending on the lender and product, funding can be paid as a single amount or staged, which can align with project milestones and certifications. For larger projects, staged drawdowns can be paired with monitoring surveyor visits, helping manage risk and ensuring the release of funds matches progress.

What the customer journey typically looks like

1. Customer enquiry and budget check: Confirm rough scope, indicative cost per m², and preferred monthly budget.

2. Site survey and specification: Produce a clear proposal that separates build, professional fees, and approvals where relevant.

3. Finance eligibility prompt: Offer finance as an option early, before value engineering becomes the default.

4. Application: Customer completes a short application and provides required details.

5. Decision and offer: The lender confirms approval, terms and any conditions.

6. Acceptance and documentation: Customer reviews and accepts the agreement.

7. Project funding: Funds are released either upfront or in stages, depending on the product and project size.

8. Works delivered: You complete the project, keeping paperwork organised for any staged releases.

9. Aftercare: Provide completion documents and maintain a clear snagging process.

How to launch finance with Kandoo

Getting started is about making finance part of the way you quote, not a last-minute rescue tool. Kandoo can help you position repayments alongside the full project price so customers can compare options confidently. You will typically align your proposal format, train staff on compliant conversations, and embed a simple application link or workflow at the point customers are most ready to proceed, often after the outline design and budget range are agreed. From there, you focus on delivering the conversion, while the finance process runs in parallel through a regulated journey, keeping decisions, disclosures and affordability checks where they belong.

Next steps to implement this week

• Add a “from £X per month” example next to your typical basement packages (with clear subject-to-status wording).

• Update your quote template to show build costs plus professional and regulatory costs as a complete project.

• Decide whether larger projects should be offered with staged funding aligned to milestones.

FAQs

Q: What does it cost to convert a basement in the UK?
A: Costs vary widely, but guides often cite around £750 to £3,000 per m², with high-end London projects potentially exceeding £3,000 to £4,500+ per m² depending on excavation, waterproofing and finishes.

Q: What is a typical total budget for a basement conversion?
A: Many projects fall in the £80,000 to £200,000 range, with complex excavations and premium specifications sometimes rising into several hundred thousand pounds.

Q: Can finance cover architects, engineers and approvals as well as building work?
A: Often, yes. Professional fees can be significant, and planning and building-control costs can add further spend, so it is sensible to explore finance that covers the full project stack.

Q: Do lenders offer a dedicated “basement-dig mortgage”?
A: Not typically as a named product. Basement works are usually treated as home improvements funded via remortgaging, additional borrowing, or secured lending, subject to affordability and lender criteria.

Q: What finance routes do homeowners commonly consider for basement conversions?
A: Common routes include remortgaging to raise funds over longer terms, or secured home-improvement loans that can suit customers who do not want to replace their existing mortgage.

Q: Can funding be released in stages during the build?
A: Yes, staged drawdowns are often used for larger projects, with funds released as work is certified, which can support cash flow and reduce risk.

Q: Will offering finance slow down my sales process?
A: Done properly, it often speeds decisions up. The key is to introduce finance early, price the full project clearly, and keep the application journey simple.

Q: What should I avoid saying when discussing finance with customers?
A: Avoid implying acceptance is guaranteed or suggesting a product is “best” for them. Keep language factual, signpost that finance is subject to status and affordability, and ensure the lender provides the regulated explanations.