How Development Finance Works: Drawdowns, QS Reports & Interest

Development finance operates very differently from a standard bridging loan or mortgage. The headline rate is one thing — but the mechanics of how funds are drawn, how interest accrues, and how the lender monitors the project are what determine whether the product actually works for your scheme.

This guide walks through the entire lifecycle of a development finance loan: from the initial facility agreement through to final drawdown and exit.

The Facility Structure

A development finance facility consists of two main components:

Land / acquisition element — if the lender is funding land purchase as part of the facility, this is the amount released on day one against the site. Not all development lenders fund land; some only fund construction.

Construction element — the funds drawn during the build, released in stages tied to build progress.

Together these form the total facility. A typical facility letter will state:

• Total facility: £X
• Land element: £Y (released on completion of land purchase)
• Construction element: £Z (drawn in tranches during the build)
• Drawdown schedule: agreed milestones or periodic inspections

The Drawdown Process

Construction funds are not released in a lump sum. They are drawn in tranches — typically four to eight drawdowns over the course of the project, though this varies by project size and lender.

How Each Drawdown Works

Step 1: Developer submits a drawdown request When a milestone is reached (e.g., foundations complete, roof on, first fix complete), the developer submits a drawdown request to the lender. This request details the works completed and the amount requested.

Step 2: QS inspection The lender's Quantity Surveyor (QS) visits the site to verify that the claimed work has been completed to the agreed specification and cost plan. The QS checks:

• Work completed matches the drawdown request
• Quality of work meets specification
• Build programme is on track
• Remaining costs are sufficient to complete the scheme

Step 3: QS certifies the drawdown The QS issues a certification report to the lender confirming the works and the recommended drawdown amount. If the QS identifies defects, programme delays, or cost overruns, the drawdown may be reduced or withheld until these are resolved.

Step 4: Lender releases funds The lender transfers the approved drawdown amount to the developer (or directly to the contractor, on some facilities).

Typical drawdown timeline: from request submission to funds in account — 5–10 working days if the QS inspection goes smoothly.

The Quantity Surveyor (QS)

The QS is one of the most important participants in a development finance deal, but one that developers sometimes underestimate until they hit a drawdown issue.

Who appoints the QS? The lender instructs the QS from their approved panel. You don't choose them. The cost of QS monitoring is paid by you (the developer), typically invoiced per inspection or as a lump sum up front.

What the QS monitors:

• Build cost schedule — the agreed breakdown of construction costs across all work packages. The QS checks that the actual costs being incurred match this schedule.
• Progress relative to programme — is the build on schedule? Lenders need confidence the scheme will complete within the loan term.
• Retention of value — the QS confirms that the works completed to date represent the value claimed.
• Cost to complete — critically, the QS maintains a running estimate of how much it will cost to finish the scheme. If this number rises above the agreed build budget, it's a trigger for the lender.

What happens if the QS flags a problem?

• Minor issues (small cost overruns, minor programme slippage): the QS notes it; the lender may ask for a brief explanation.
• Moderate issues (material overruns, specification changes, contractor problems): the lender may require additional information, cost re-forecasting, or an updated programme.
• Serious issues (the contingency is exhausted, the contractor has failed, the scheme risks stalling): the lender may withhold future drawdowns until the issue is resolved, or in extreme cases call in the loan.

Having an experienced main contractor and a clear cost plan minimises QS issues. Surprises are expensive — in both time and relationship with the lender.

How Interest Accrues

This is where development finance differs most materially from a bridging loan.

Interest is charged only on the drawn balance, not the total facility.

If your facility is £800,000 but you've only drawn £250,000 so far, interest accrues on £250,000.

Example Interest Calculation

Facility: £800,000 Monthly rate: 0.85%

Compare this to a bridging loan of £800,000 at 0.85%/month over 8 months:

• Month 1 interest: £6,800
• Total interest (approx): £56,000+

The staged drawdown structure saves the developer approximately £22,000 in interest on this example — simply because you're not paying interest on money you haven't yet deployed.

Where Does the Interest Go?

Like bridging, development finance interest is typically rolled up — added to the outstanding loan balance rather than paid monthly. A portion of the construction facility is often reserved to service the rolled-up interest, ensuring there's always capacity in the facility to cover it.

Some lenders also offer retained interest (deducted upfront from the facility), which reduces net funds but simplifies cashflow forecasting.

The Drawdown Schedule and Milestones

Most development finance facilities use one of two drawdown structures:

Milestone-based: Funds are drawn upon completion of specific construction milestones. Common milestones include:

• Substructure complete (foundations and ground floor slab)
• Superstructure complete (walls to wall plate)
• Roof structure complete (weathertight)
• First fix complete (internal framing, electrical and plumbing first fix)
• Second fix and plastering complete
• Practical completion

Periodic inspection: Some facilities use regular QS inspections (monthly or quarterly) regardless of specific milestones, with drawdowns based on percentage of works complete at each inspection date. More common on larger or more complex schemes.

The drawdown schedule is agreed with the lender before the facility is signed. It should align with your contractor's payment schedule — if your contractor invoices monthly and your facility draws quarterly, you have a cashflow gap to manage.

Practical Completion

Practical completion (PC) is the point at which the development is finished to a standard that allows occupation — typically confirmed by the architect or building inspector issuing a Practical Completion Certificate.

PC is the key milestone for development finance because:

1. The development loan term typically expires at or shortly after PC — the loan must be repaid (via sales, refinance, or exit finance) once the project completes.
2. Insurance changes — during construction, you need construction insurance. After PC, you need standard buildings insurance.
3. NHBC warranty (for new builds) — the 10-year structural warranty typically activates at PC.
4. Sales can now exchange and complete — buyers (and their mortgage lenders) will not typically complete until PC is confirmed.

If you're retaining completed units as investments, PC is the trigger to start mortgage applications for the long-term financing. See Development Finance Hub for guidance on exit routes.

Common Pitfalls

Underestimating build costs: The QS will review your cost plan before the facility is agreed. If your numbers are unrealistic, the QS will flag it — which can lead to a lower maximum facility or conditions being placed on the loan. Get your build costs professionally costed before application.

Slow drawdown requests: Some developers delay requesting drawdowns when cashflow is comfortable. This is generally fine, but check your facility for any minimum draw requirements or longstop dates.

Contractor problems: If your main contractor goes into administration or abandons the site, the QS will immediately flag this to the lender. Have a plan in place — who can take over, at what cost, and on what timeline.

Planning conditions: If the planning permission has conditions that must be discharged before construction can proceed past a certain point, ensure these are in hand before the lender reaches that drawdown. Lenders will not advance against works that breach planning conditions.

Interest reserve exhaustion: If the scheme runs over schedule, the rolled-up interest grows beyond the reserve amount. Make sure the facility includes sufficient headroom and that you have a plan if the build takes longer than expected.

Getting the Deal Structured Correctly

Development finance deals are more complex than bridging loans, and structuring them correctly from the outset saves significant time and money. Key decisions:

• Senior vs mezzanine structure: For developers wanting to maximise LTC, a senior + mezzanine stack (with a mezzanine lender sitting behind the senior lender) can unlock higher effective LTCs — sometimes up to 90%.
• Land and build vs construction only: If you own the land or are acquiring it separately, a construction-only facility reduces complexity and often improves pricing.
• Drawdown schedule alignment: Ensure drawdown milestones align with your contractor's payment terms to avoid cashflow crunches.

Get in touch with our team to discuss how to structure your development finance deal. We'll review your appraisal, identify the right lenders, and manage the process from application through to final drawdown.