What Actually Happens Before You Build: Inside a Feasibility and Compliance Call

Most people considering a modular home, garden annexe, or retrofit start with the same question: is this even possible on my site? It’s a fair question, and it’s usually impossible to answer with a quick yes or no. That’s what a feasibility and compliance call is for.

It starts with the site, not the design

Before anyone talks about layouts, materials, or timelines, the first job is understanding the site itself. That means looking at access (can a modular unit actually be delivered and craned or wheeled into position), ground conditions, existing structures, boundaries, and any obvious constraints like slopes, trees, or overhead lines. A site that looks straightforward in photos can turn out to have real limitations once someone looks properly, and a site that looks tricky can sometimes be more workable than expected.

Then come the compliance questions

Modular housing and retrofit projects in the UK sit under planning and building regulations that vary depending on what you’re building, where, and how big it is. Some projects fall under permitted development rights and don’t need full planning permission. Others do, particularly if a property is listed, in a conservation area, or the proposed structure exceeds certain size or height thresholds. Because these rules change and depend heavily on local authority interpretation, this stage isn’t about guessing. It’s about identifying which route applies to your specific project and flagging it early, before any money is spent on design work that might not be approvable.

Delivery coordination gets mapped out too

Modular and retrofit projects usually involve several different trades and suppliers working in sequence: groundworks, the modular unit itself, connections to utilities, finishing work. A feasibility call isn’t just about whether a project can happen, but roughly how it would need to be sequenced and coordinated so nothing gets built in the wrong order or held up waiting on something else.

What you walk away with

By the end of a feasibility and compliance call, you should have a realistic picture of:

• Whether your site can support what you’re hoping to build
• Which compliance route applies, and what it would require
• What the rough shape of the project looks like in terms of sequencing
• What questions still need answering before design work starts

It’s not a sales pitch and it’s not a quote. It’s the groundwork that makes everything after it, including design, planning applications, and delivery, much less likely to hit an expensive surprise halfway through.

If you’re not sure whether your project needs this step, the honest answer is: almost every modular or retrofit project benefits from it, even ones that seem simple on paper.