Broker / Investor Guide

Commercial conversion due diligence: what investors must check first.

Commercial conversions can look strong on a spreadsheet, but the real test is planning, structure, cost control, compliance, valuation logic and exit viability.

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Core principle

A conversion is not just a change of use.

Commercial conversion opportunities can be attractive because they combine planning upside, value creation and a clear property story. But the risks are often hidden in the detail. A building may appear capable of conversion, but that does not mean the legal route, planning history, physical structure, building regulations, fire strategy, funding structure and exit route all work.

Before capital is committed, the investor should understand what is already permitted, what still needs approval, what professional advice has been obtained and what could prevent the strategy from completing inside the intended finance term.

Finanze Capital view: the most credible conversion cases separate what is confirmed from what is assumed. Lenders can work with complexity, but not with unanswered questions.

Planning and legal position

The planning route must be clear.

The first due diligence question is whether the proposed use is legally achievable. Some schemes rely on full planning consent, some rely on permitted development rights, and some need prior approval or confirmation that existing use has been lawfully established.

Planning history

Review previous applications, refusals, conditions, enforcement issues and any site-specific restrictions.

Permitted development

Check whether the relevant rights apply, whether prior approval is needed and whether any Article 4 direction or restriction affects the site.

Title constraints

Restrictive covenants, rights of way, access, easements, leasehold consents or third-party rights can affect delivery.

Technical due diligence

The physical building decides whether the numbers are real.

Commercial buildings can hide costs that are not obvious at viewing. Structure, roof condition, floor loading, drainage, utilities, asbestos, damp, fire escape, sound insulation and building services can all change the cost and programme.

Structural condition

Survey the building properly. A weak roof, poor frame, water ingress or structural movement can materially change the funding requirement.

Fire and access

Escape routes, compartmentation, alarms, sprinklers, access, shared areas and management arrangements should be considered early.

Utilities and services

Capacity for power, water, heating, ventilation, drainage and broadband can affect cost, timetable and final marketability.

Cost control

The works budget needs more than a headline figure.

A conversion budget should be broken down into major packages with contingency. Lenders will look for evidence that the borrower understands the works, the professional team, the programme and the drawdown requirement.

Budget quality

Separate acquisition costs, professional fees, planning costs, statutory costs, building works, contingency, finance costs and sales or refinance costs.

Delivery route

Explain who will manage the works, whether a contractor is appointed, whether fixed pricing is available and what happens if costs increase.

A weak budget can make an apparently profitable conversion unbankable. If the contingency is too low or the programme is unrealistic, the lender may reduce leverage or decline the case.

Valuation and exit

The exit must match the completed asset.

Conversion finance usually depends on either sale or refinance after the scheme is completed or stabilised. The lender therefore needs to understand current value, completed value, rental value, market evidence and whether the proposed end product is genuinely demanded in that location.

Who is the likely buyer or refinance lender after completion?
Will the completed units be mortgageable?
Do local rents support the refinance assumption?
Are comparable sales genuinely comparable?
Does the borrower have enough time and contingency if sales are slower than expected?

Conversion exits should be stress tested. A sale-led exit, refinance-led exit and fallback hold position can produce very different funding conclusions.

Submission checklist

What to provide before requesting terms.

Planning pack

Planning history, consent status, permitted development analysis, drawings, conditions and professional planning commentary.

Works pack

Schedule of works, cost plan, contingency, programme, contractor details, professional team and known technical risks.

Funding pack

Purchase price, current value, GDV or completed value, borrower contribution, facility requirement, drawdown need and exit route.

Next step

Use the Get A Quote route and include the planning position, proposed works, cost schedule, current value, expected end value, borrower structure and exit route. Indicative terms remain subject to underwriting, valuation, legal due diligence, credit approval and final documentation.