Interbay Development Finance Review (2026): Bridging, Developer Exit and Verdict

Interbay is a specialist lender whose development lending sits inside its bridging finance range — not as a standalone “development finance” product. If you arrive expecting published loan-to-GDV ratios and a clear drawdown schedule, Interbay will feel opaque. If you arrive via a specialist broker with a developer exit, commercial conversion, or refinance and development requirement, it can be a credible and well-capitalised option.

This review covers Interbay’s bridging products with development application. Pricing and eligibility are bespoke throughout — this review explains what that means in practice.

Interbay Development Finance at a Glance

Our Verdict

Interbay is a solid option for experienced developers and investors who need flexible, case-by-case underwriting rather than a tick-box product. Its backing from OSB Group (OneSavings Bank PLC) — one of the UK’s larger specialist lending groups — provides balance sheet strength and institutional credibility. The trade-off is near-total opacity on pricing, criteria, and process: you cannot access Interbay directly and you will not find a published rate table or eligibility checker. Everything flows through a broker, and every deal is assessed on its own merits by a Transactional Credit Committee.

For straightforward development projects or first-time developers, there are better-signposted alternatives. For complex, higher-value deals where bespoke structuring is a feature rather than a bug, Interbay belongs on the shortlist.

Best For

• Experienced developers needing a developer exit loan at up to 75% LTV
• Commercial conversion projects requiring flexible underwriting
• Refinance and development requirements on larger or complex assets
• Borrowers operating through limited companies, SPVs, LLPs, trusts, or SIPPs
• Deals requiring a lender with significant balance sheet depth (£54.5m central London transactions completed in Q1 2026)

Not Ideal For

• First-time developers with limited track record
• Borrowers who need published pricing before approaching a broker
• Time-critical deals where a fast, automated decision is needed
• Smaller transactions where the bespoke process is disproportionate to the loan size
• Borrowers who prefer to deal directly with a lender rather than through an intermediary

Key Facts

• Products: Developer exit loans, commercial conversions, refinance and development loans (all accessed via bridging finance range)
• Indicative rate: From 0.79% per month
• Developer exit LTV: Up to 75%
• General bridging LTV: 55% for newer products
• Loan sizes: Case studies range from £600,000 to £54.5 million; no published minimum or maximum
• Access: Broker-only; no direct applications accepted
• Parent group: OSB Group (OneSavings Bank PLC)
• Trustpilot: 3.5 out of 5 (70 reviews)
• Regulated: Commercial and bridging lending is unregulated under FSMA 2000

What Is Interbay Development Finance?

How Interbay Development Finance Works

Interbay does not use the phrase “development finance” as a product name. Its bridging finance range covers developer exit loans, commercial conversions, and refinance and development loans — all with clear development application but structured around bridging rather than the traditional ground-up development model. Understanding this framing matters before you approach a broker.

In practice, Interbay suits the later stages of a development: refinancing an existing development loan, releasing equity from completed or near-completed stock, or converting a commercial asset. Borrowers seeking a ground-up facility with staged drawdowns against architect certificates will find more appropriate structures elsewhere.

All lending is bespoke. The Transactional Credit Committee reviews each case individually — no published loan-to-GDV ratio, no standard fee schedule, no automated decisioning. This gives experienced developers headroom to present complex deals, but places significant weight on broker presentation quality and track record.

OSB Group Ownership and Background

Interbay is a trading name of InterBay Funding Limited (Company Registration Number: 05595882), which sits within OSB Group PLC — OneSavings Bank. OSB Group is a FTSE 250 specialist lending group that also owns Kent Reliance, Precise Mortgages, and Charter Savings Bank. The group reported originations of £1.2 billion in Q1 2026, an 11% increase year-on-year, reflecting underlying demand for specialist lending across its portfolio.

The OSB Group umbrella matters for two reasons. First, it provides Interbay with access to institutional balance sheet depth: the £54.5 million central London refinance completed in April 2026 demonstrates the scale of transactions the lender can absorb. Second, it offers borrowers the reassurance of lending through a regulated group entity — even though commercial bridging lending itself sits outside the FCA’s FSMA 2000 framework. Interbay is not a fringe or newly capitalised lender; it operates within a group that holds full banking licences and is subject to PRA supervision at the parent level.

Interbay Development Finance Rates, Fees and Leverage

Interest Rates and Indicative Pricing

The only published rate indicator from Interbay is a headline bridging rate from 0.79% per month. All other pricing is bespoke, negotiated on a case-by-case basis through the Transactional Credit Committee. There is no published rate card, no indicative LTV-to-rate matrix, and no fee schedule available without a broker submission.

A recent publicly documented transaction illustrates the upper end of the pricing range: a £54.5 million complex refinance of two central London office buildings with high ESG credentials was completed in April 2026 on a 10-year interest-only structure, fixed for five years at 6.99%. This is a commercial refinance rather than a short-term bridging product, but it gives a real-world data point for larger, longer-term structured deals.

For developer exit loans and shorter-term bridging, the 0.79% monthly floor translates to a headline annualised cost of around 9.5% before fees, though actual rates will reflect deal size, LTV, borrower profile, and asset type. Rolled-up or serviced interest arrangements are available but not published as standard options — both are common in the bridging market and almost certainly available on request via a broker.

Fees and Borrower Costs

Interbay does not publish an arrangement fee, exit fee, or valuation fee schedule. Costs are negotiated at point of credit committee review. Borrowers should budget on typical specialist bridging market assumptions: arrangement fees of 1–2%, plus third-party costs including RICS valuation, legal fees for both sides, and monitoring surveyor costs where staged drawdowns are agreed. You cannot model total borrowing costs without heads of terms in hand — factor in a wider cost range at feasibility stage.

Loan-to-Value and Loan Size Ranges

Interbay publishes one clear LTV figure: developer exit loans are available at up to 75% LTV. For newer general bridging products, the published LTV is 55%. All other leverage ratios — including loan-to-GDV and loan-to-cost for development-related transactions — are not published and are determined on a case-by-case basis.

The 75% LTV on developer exit is competitive. Many mainstream bridging lenders cap developer exit at 65–70% LTV, and the additional headroom at 75% can be meaningful when releasing equity from completed stock to recycle capital into the next project. The 55% cap on general new bridging products is comparatively conservative, reflecting a cautious approach to general-purpose bridging where the exit strategy may be less defined.

On loan size, Interbay’s published case studies range from a £600,000 commercial conversion to a £24.9 million refinance and development loan. The £54.5 million central London refinance completed in April 2026 demonstrates that the lender can operate well above that published range for the right deal. There is no stated minimum, but the bespoke underwriting model implies a natural lower floor — the committee-level process makes very small loans operationally inefficient for both lender and borrower.

Interbay Development Finance Eligibility

Developer and Borrower Types Accepted

Interbay accepts a wide range of borrowing structures: individuals, limited companies, SPVs, LLPs, partnerships, trusts, and SIPPs. This flexibility is a genuine advantage over lenders whose products are restricted to standard limited company borrowers. Developers who hold assets in trust structures, pension-linked vehicles, or complex partnership arrangements will find Interbay more accommodating than many high-street alternatives.

The lender’s stated position is that it offers “bespoke and flexible solutions and pricing on a case-by-case basis.” In practice, this is not a lender for inexperienced or under-capitalised developers. Case studies and intermediary commentary consistently point to Interbay working with borrowers who have an established track record, clear exit strategies, and assets of sufficient quality to justify the Transactional Credit Committee process. A first-time developer with a single-unit project will not typically be the right fit, regardless of loan size.

Project Types and Property Criteria

Interbay’s development-relevant bridging products cover three main project types: developer exit loans (refinancing completed or near-completed stock), commercial conversions (change of use or repurposing of commercial assets), and refinance and development loans (refinancing an existing development position, typically mid-project). This is a more targeted suite than a full-spectrum development lender, and borrowers should be clear about which category their project falls into before approaching a broker.

Property criteria are not published in detail. From case study evidence, Interbay has funded central London office buildings, mixed-use conversions, and residential-led development refinances. The ESG credentials of the £54.5 million April 2026 transaction suggest the lender is alert to sustainability factors on larger commercial assets, which may be increasingly relevant for deals in that segment.

Assets that would typically be challenging across the bridging market — agricultural land, high-rise residential above a certain height, ex-local-authority blocks, properties with significant structural issues — are not explicitly excluded by Interbay but should be flagged to a broker at the outset. The bespoke model means exceptions can potentially be accommodated, but they will require a stronger overall case.

Credit Profile Requirements

Interbay does not publish a minimum credit score or adverse history threshold. Credit profile is assessed holistically alongside deal quality, asset value, and exit strategy. Mild adverse history — satisfied CCJs, historical missed payments — may be accommodatable for experienced developers with compelling overall cases. Borrowers with more significant credit issues will find specialist lenders with explicit adverse mandates a better starting point.

The most important eligibility factor is the credibility of the exit strategy. The committee will scrutinise it closely regardless of borrower strength. Vague or over-optimistic exit assumptions are the most common reason a deal does not proceed.

Interbay Development Finance Application and Drawdown

How to Apply Through a Broker

Interbay operates a broker-only model. There is no direct application route for borrowers. Access is through Interbay’s selected Key Partners and specialist packagers — intermediaries who have established relationships with the lender and understand its underwriting appetite. If you approach Interbay’s website directly, you will be directed to contact the team via a broker; individual borrower enquiries are not processed.

Choosing the right broker matters here more than with most lenders. Because Interbay’s appetite is undisclosed and case-by-case, a broker with active experience of Interbay deals will be better placed to assess fit, package the submission effectively, and manage expectations on timeline and terms. Generalist mortgage brokers without specialist bridging and development experience are unlikely to be the right channel. Specialist bridging packagers and property finance brokers with Interbay key partner status are the appropriate route.

Transactional Credit Committee and Underwriting

Every Interbay development-related deal is reviewed by its Transactional Credit Committee — an internal body that considers the full case rather than applying automated scoring. This is both a strength and a constraint. The strength is that complex, unusual, or high-value deals can be assessed on their actual merits rather than filtered out by a tick-box system. The constraint is that the process takes longer than automated underwriting platforms and places significant weight on the quality of documentation and presentation.

Interbay does not publish decision timelines. In the specialist bridging market, committee-level decisions on complex deals can take anywhere from a few days for a well-packaged case to several weeks for transactions requiring additional due diligence. The £54.5 million central London refinance cited by Interbay was completed in 14 weeks from initial engagement to drawdown, which provides a useful data point for larger, more complex transactions. Simpler developer exit deals will typically move faster.

Drawdown and Loan Management

Drawdown mechanics are not published as a standard framework. Developer exit loans will typically involve a single drawdown against valuation. Commercial conversions and refinance and development loans may involve staged drawdowns against milestones, structured individually as part of credit committee approval. Borrowers should clarify extension terms, early repayment provisions, and monitoring requirements at heads of terms — not after drawdown.

Interbay Development Finance Project Support and Risk

Bespoke Solutions and Case Handling

Case studies on Interbay’s website illustrate deals requiring creative structuring: a £24.9 million refinance and development loan completed mid-project where other lenders required full completion first, and a £600,000 commercial conversion with specialist security analysis. These suggest a lender genuinely willing to engage with deal complexity rather than apply standard product filters.

Time invested in broker selection and case preparation is repaid in the quality of terms offered. A well-packaged submission — clear on project, track record, asset value, and exit strategy — gives the committee its best basis for approval. Undercooked submissions produce extended due diligence or decline, not goodwill.

Developer Risks and Interbay’s Risk Appetite

The primary risk is pricing opacity. Without a published rate card or fee schedule, it is impossible to assess value for money until heads of terms are in hand. Alternatives such as Aldermore and Octopus Real Estate are more transparent at the research stage; Interbay terms may ultimately prove competitive, but only the broker and committee process will confirm that.

The secondary risk is deal duration. The committee-based process adds time, and Interbay publishes no decision SLAs. For deals with tight acquisition deadlines, this is a genuine constraint. Interbay’s risk appetite is calibrated toward established developers, quality assets, and credible exits — the 75% LTV on developer exit is generous in principle, but the committee will require a strong overall case to lend at that level.

Interbay Development Finance Customer Reviews

What Intermediaries Say

Interbay holds a Trustpilot rating of 3.5 out of 5 stars, based on 70 reviews. The low review count is consistent with the lender’s intermediary-only business model: borrowers interact with their broker rather than with Interbay directly, which means the end-client experience is mediated and reviews are sparse relative to direct-to-consumer lenders. Positive intermediary commentary tends to focus on Interbay’s willingness to engage with complex cases, the competence of its underwriting team, and the institutional backing that comes with OSB Group ownership.

Specialist brokers who work regularly with Interbay generally position the lender as a credible option for larger, more complex bridging and development refinance deals where bespoke structuring is required. The Transactional Credit Committee process draws both praise and criticism: experienced brokers who present well-packaged cases value the flexibility; brokers who encounter Interbay for the first time can find the lack of published criteria frustrating.

Common Concerns

The most consistent concern raised about Interbay is the opacity of its pricing and process. Borrowers and some brokers report difficulty in obtaining indicative terms without a full submission, making it hard to assess Interbay against alternatives at an early stage of deal exploration. This is a structural feature of the bespoke model rather than a specific operational failing, but it creates genuine friction for borrowers who want to compare lenders efficiently.

A smaller number of reviews reference slower-than-expected decision timelines, particularly on complex deals requiring extended due diligence. Given the committee-based underwriting model, this is not surprising, but it underlines the importance of engaging Interbay early — not as a last resort when other lenders have declined — if the transaction timeline is tight.

Interbay Development Finance Support and Regulation

Broker Support and Key Contacts

Interbay’s intermediary support is structured around its Key Partners network — specialist brokers and packagers approved to submit business directly. Brokers without an existing relationship must register through the lender’s intermediary portal first. No public BDM directory or regional contact list is available; broker-facing contacts are provided during onboarding or via packager relationships. Response times are not published as SLAs; intermediary experience varies and is best assessed through broker peer networks rather than the lender’s own materials.

Regulatory Status and Complaints

Interbay’s commercial bridging and development lending is unregulated under FSMA 2000. Borrowers do not receive the statutory protections that apply to regulated mortgage contracts — including Financial Ombudsman Service access. This is standard across the specialist bridging market and applies to the vast majority of development finance products from all lenders in this space.

InterBay Funding Limited (Company Registration Number: 05595882) operates within the OSB Group regulatory perimeter. OSB Group PLC holds a full UK banking licence and is regulated by both the PRA and FCA at group level, providing structural financial oversight absent from some smaller bridging lenders. Complaints about commercial lending should go to Interbay’s internal complaints process first; unresolved disputes have recourse through the courts rather than the Financial Ombudsman.

Interbay Development Finance vs Alternatives

Interbay vs Aldermore Development Finance

Aldermore offers a dedicated development finance product with published criteria: loans up to £50 million, up to 65% LTGDV, explicit track record requirements. Aldermore publishes indicative rate ranges and eligibility details, making self-screening straightforward before broker engagement — Interbay offers no equivalent transparency.

Interbay’s advantage is the higher LTV on developer exit (75% vs Aldermore’s more conservative refinancing approach) and greater flexibility for complex borrower structures. Aldermore is a structured bank development facility; Interbay is a bespoke bridging arrangement. The right choice depends on project stage and deal complexity.

Interbay vs Octopus Real Estate Development Finance

Octopus Real Estate is an institutional fund manager with a dedicated development finance product suite, published leverage ratios, and clear eligibility criteria. It offers a full-stack facility from land with planning through to practical completion — a scope Interbay’s bridging range does not match. Developers needing a lender from day one of a ground-up project will find Octopus a better fit. Developers refinancing a development position or exiting completed stock may find Interbay’s 75% LTV and bespoke structuring more competitive.

Interbay vs Other Bridging and Development Lenders

The broader market includes Roma Finance, Hilltop Credit Partners, West One Loans, and Shawbrook. Some offer higher leverage on ground-up residential development or explicitly welcome first-time developers. Others compete on developer exit LTV with more published criteria and faster decisioning.

Interbay’s position is as a mid-to-large complex-deal specialist: not the fastest, not the most transparent, not the most accessible to newer developers. For deals that do not fit a standard template — unusual borrower structures, complex asset types, large loan sizes — its committee-level flexibility and OSB Group balance sheet offer something a purely product-led lender cannot.

Final Verdict: Is Interbay Right for Your Development?

Interbay is a specialist’s lender in the truest sense: it offers genuine flexibility on complex deals, but that flexibility comes at the cost of transparency. If you need published pricing, clear eligibility criteria, and a fast decision, there are better-suited options in the market. If you have an experienced track record, a strong deal, and access to a specialist broker with an Interbay relationship, it can be a credible and well-capitalised choice — particularly for developer exit at up to 75% LTV, commercial conversions, or larger refinance and development transactions.

The OSB Group parentage is a meaningful stability factor. The Transactional Credit Committee model, while slower, allows genuine engagement with deal complexity. The 3.5-star Trustpilot rating reflects a B2B intermediary model where direct borrower reviews are structurally sparse — it should not be read as a proxy for deal quality or lender reliability.

Approach Interbay through a specialist broker, present a well-evidenced case, and allow adequate time for the committee process. Do not use Interbay as a last resort after other lenders have declined — its appetite is for quality deals, not salvage situations. Used correctly, it is a solid addition to the shortlist for experienced property developers and investors with the right deal profile.

Frequently Asked Questions

• Does Interbay offer standalone development finance?

  No. Interbay does not offer a product labelled “development finance” as a standalone category. Development lending is accessed through its bridging finance range, which includes developer exit loans, commercial conversions, and refinance and development loans. If you are looking for a ground-up development facility with staged drawdowns from land acquisition through to practical completion, Interbay’s current product range is unlikely to be the right fit.

• What LTV does Interbay offer for developer exit loans?

  Interbay offers developer exit loans at up to 75% LTV. This is one of the more competitive LTV ratios in the specialist bridging market for developer exit, where many lenders cap at 65–70%. The 75% LTV is subject to case-by-case credit committee approval and will depend on the quality of the security, the clarity of the exit strategy, and the borrower’s overall profile.

• Can Interbay fund commercial conversions?

  Yes. Commercial conversions are an explicit part of Interbay’s bridging finance range. Published case studies include a £600,000 commercial conversion facility, demonstrating appetite for smaller transactions as well as larger deals. Terms for commercial conversions are bespoke and will be assessed by the Transactional Credit Committee on a case-by-case basis.

• Does Interbay have a Trustpilot page?

  Yes. Interbay holds a Trustpilot rating of 3.5 out of 5 stars based on 70 reviews. The relatively low number of reviews reflects the lender’s intermediary-only model: borrowers interact with their broker rather than with Interbay directly, which reduces the volume of end-borrower reviews compared with direct-to-consumer lenders. The rating should be contextualised accordingly.

• Is Interbay development finance regulated by the FCA?

  No. Interbay’s commercial bridging and development-related lending products are unregulated under FSMA 2000. Borrowers do not receive the statutory protections — including Financial Ombudsman Service access — that apply to regulated mortgage contracts. This is standard across the commercial bridging and development finance market. Interbay’s parent, OSB Group PLC, holds full banking licences and is regulated by the PRA and FCA at the group level, which provides structural financial oversight even where the individual lending products fall outside the consumer regulatory framework.

How We Reviewed Interbay Development Finance