Identifying the right development site has always been one of the most critical decisions a property developer can make.

However, in today’s market, where build costs remain elevated, planning timelines can be uncertain, and buyer demand is more nuanced, selecting the right site is more important than ever.

A scheme that might have worked a few years ago may no longer stack up under current conditions. Margins are often tighter, and there is less room for error.

👉 In today’s environment, a “good” development site is not just about potential, it’s about certainty, viability, and deliverability.

In this article, we explore the key factors that define a strong development site in today’s market, and what developers should be focusing on when assessing new opportunities.

1. Planning Potential and Certainty

Planning remains one of the most significant variables in any development project.

A strong development site typically benefits from:

Existing planning consent
A clear and realistic planning pathway
Alignment with local authority policies

Sites with full planning permission offer:

Greater certainty
Faster mobilisation
Lower upfront risk

However, sites with planning potential can still present strong opportunities, provided the risks are well understood and properly priced.

Developers should consider:

Local planning authority track record
Policy support for the proposed scheme
Likelihood of delays or objections

👉 In today’s market, certainty of planning is often more valuable than speculative upside.

2. Location and Underlying Demand

Location has always been fundamental in property development, and that hasn’t changed.

However, what defines a “good location” has evolved.

Developers are increasingly focusing on:

Areas with strong rental demand
Locations benefiting from infrastructure investment
Regional towns and cities with population growth
Affordability driven markets

Key considerations include:

Transport links
Employment hubs
Local amenities
Supply vs demand dynamics

In some cases, secondary locations can now offer:

Better entry pricing
Stronger yields
Greater demand resilience

👉 A good site is not just well located, it is aligned with real, sustainable demand.

3. GDV vs Total Project Cost

At its core, development viability comes down to numbers.

A strong development site must offer:

A sufficient margin between Gross Development Value (GDV) and total project costs
Room for contingencies
Protection against market fluctuations

Developers should ensure:

GDV assumptions are realistic (not optimistic)
Build costs are accurately assessed
Finance costs are fully accounted for

In today’s market, many developers are taking a more conservative approach by:

Stress testing GDV
Allowing for cost overruns
Building in margin buffers

👉 If the numbers only work under perfect conditions, the site is unlikely to be robust enough.

4. Buildability and Site Constraints

A site may look attractive on paper, but practical considerations can significantly impact delivery.

Common constraints include:

Access limitations
Ground conditions
Topography
Existing structures
Utility connections

These factors can:

Increase build costs
Extend timelines
Introduce unforeseen risks

Developers should undertake early due diligence to assess:

Site feasibility
Construction complexity
Potential cost implications

👉 A good development site is not just viable in theory, it must be practical to deliver in reality.

5. Clear and Achievable Exit Strategy

Every development project should begin with the end in mind.

A strong site will support a clear exit strategy, whether that is:

Sale of units
Refinancing onto a term facility
Long term hold for rental income

Developers should assess:

Buyer demand for the end product
Pricing sensitivity
Rental yields and refinance viability

In uncertain markets, flexibility can be key. Sites that allow for:

Multiple exit options
Phased delivery
Mixed use strategies

can provide additional resilience.

👉 If the exit is unclear, the risk increases significantly, regardless of how attractive the site may appear.

6. Alignment with Market Conditions

Markets evolve, and successful developers adapt accordingly.

In today’s environment, there is increasing focus on:

Practical, deliverable schemes
Mid market housing rather than premium stock
Strong rental demand rather than purely speculative sales

Developers should consider:

Who the end buyer or tenant is
Whether the product matches current demand
How the scheme performs under different market scenarios

👉 A good site is one that fits the market as it is today, not as it was in the past.

7. Funding and Lender Appetite

A critical but sometimes overlooked factor is whether a site is fundable.

Even if a scheme appears profitable, it must also meet lender criteria.

Lenders will typically assess:

Loan-to-GDV (LTGDV)
Loan-to-cost (LTC)
Developer experience
Security position
Exit strategy

Sites that are:

Overly speculative
Poorly structured
Lacking sufficient security

may struggle to secure funding.

In contrast, well structured deals with strong fundamentals are far more likely to be supported.

👉 A good development site is one that works not just for the developer, but also for the lender.

8. The Importance of Discipline

Perhaps the most defining characteristic of successful developers in today’s market is discipline.

With fewer “easy wins” available, developers are:

Walking away from marginal deals
Taking a more cautious view on risk
Prioritising quality over volume

This approach helps:

Protect capital
Maintain profitability
Ensure long-term sustainability

👉 Not every opportunity is worth pursuing, and knowing when to say no is a key part of success.

Common Mistakes When Assessing Development Sites

Even experienced developers can fall into common traps, including:

Overestimating GDV
Underestimating build costs
Ignoring planning risks
Failing to account for delays
Entering deals without a clear exit
Purchasing a site above it’s residual land value

Avoiding these pitfalls is essential to selecting the right site.

How Onyx. Supports Developers

At Onyx, we work closely with property developers across a wide range of projects, from refurbishments and HMOs to ground up developments.

We understand that:

Identifying the right site is only the first step
Structuring the right funding is equally important
Speed and certainty can make the difference in securing opportunities

Our development finance solutions are designed to support developers in today’s market, including:

Funding up to 100% of project costs, when supported by additional property security
Flexible structures tailored to each scheme
In house legal and monitoring processes to help maintain momentum

Whether you’re acquiring a new site, repositioning an existing asset, or delivering a full development scheme, we aim to provide funding that supports execution, not delays it.

Final Thoughts

A good development site in today’s market is defined by more than just potential.

It must offer:

Planning clarity
Strong underlying demand
Robust financial viability
Practical deliverability
A clear exit strategy

In a market where conditions can change quickly, the best opportunities are often those that balance ambition with realism.

Developers who take a disciplined, informed approach to site selection are best positioned to succeed, regardless of market conditions.

Looking to Fund Your Next Development?

At Onyx, we provide flexible development finance and bridging solutions tailored to property developers across the UK.

If you’re assessing a new site and want to explore how funding could be structured to support your project, we’d be happy to discuss your requirements.