What Rising Interest Rates and Construction Costs Mean for Your First Development

Picture of REBECCA LLOYD-JONES

REBECCA LLOYD-JONES

Through Permit Pending and Site Intel, she analyses the forces shaping residential development in real time - from planning policy and interest rates through to construction costs, infrastructure pressure, feasibility and delivery risk - translating complex market signals into grounded, practical development intelligence.

Rising interest rates and construction costs are changing what projects are viable. A simple guide for first-time developers on understanding feasibility in 2026.

Share Post:

chart showing the feasibility squeeze in 2026, where rising construction costs and interest rates compress developer margins as buyer capacity remains constrained.

There has been a lot of noise this week about interest rates, global tensions and rising oil prices.

It can feel overwhelming, especially if you’re planning your first development or trying to make sense of your feasibility.

The key takeaway is actually quite simple:

Costs are rising, borrowing is tighter and buyers are more limited in what they can afford.

This combination is quietly changing what projects are viable – and how you need to assess risk.

1. Interest rates are changing how deals work

Higher interest rates increase:

  • your loan repayments
  • your holding costs
  • your overall project risk

They also reduce how much your future buyer can borrow.

This means your project needs to be more financially resilient from the start.

 

2. Construction costs are not stabilising as much as it seems

You may hear that prices are “settling” – but that doesn’t mean they are going down.

Global factors like oil prices affect:

  • transport of materials
  • manufacturing
  • labour and subcontractor pricing

Even short-term increases tend to become long-term cost increases.

 

3. Buyer budgets are becoming more constrained

This is one of the most important points for new developers.

Your final sale price depends on:

  • what buyers can borrow
  • how confident they feel
  • what alternatives they have

You cannot assume your end value will keep increasing.

 

4. What this means for your feasibility

A feasibility is not just a spreadsheet – it is your RISK MANAGEMENT TOOL.

Right now, you should be:

  • allowing for higher build costs
  • including realistic timeframes
  • increasing contingency
  • testing your end values conservatively

A project that only works under perfect conditions is not a safe project.

 

5. The "feasibility squeeze" explained simply

Here’s what’s happening:

  • costs are increasing
  • finance is more expensive
  • end values are capped
This creates pressure on your margin.
 

This is called the feasibility squeeze.

 

Chart showing the feasibility squeeze in 2026, where rising construction costs and interest rates compress developer margins as buyer capacity remains constrained.
Margins aren't disappearing dramatically. They're being compressed quietly - from both sides.

6. The biggest mistake new developers make right now

To make the numbers work, many people start cutting costs:

  • cheaper finishes
  • simpler design
  • reduced detailing
But this can create a new problem.
 

The product no longer matches the price you need to achieve.

This can make your project harder to sell – even if it was originally well designed.

 

7. What you should do instead

Focus on:

  • realistic feasibility assumptions
  • strong, efficient design
  • understanding your buyer clearly
  • building in contingency
The goal is not just to make the numbers work. It is to make the project work in the real market.

 

Final takeaway

The current market is not broken – it is more disciplined.

That’s a good thing.

But it does mean:

You need to approach your project with clearer assumptions, better planning and a stronger understanding of risk.

 

You can do this. Get in touch if you need more support.

Strategic development management for developers, builders and housing providers. Helping projects move from concept to construction with greater clarity and confidence.

Practical commentary on planning, feasibility, delivery and market conditions.

No spam. Just strategic updates, commentary on planning, feasibility, delivery and market conditions.