Insight

5 Ways Heritage Assets Can Derail Your Development Scheme (And How to Avoid the Delays)

06.3.26

Heritage assets are a bit like surprise guests at a dinner party: sometimes charming, sometimes challenging - but always deserving of attention.

In planning terms, a heritage asset is any building, monument, site, place, area or landscape considered valuable because of its historic, architectural, archaeological or artistic interest. That includes the big hitters (listed buildings, conservation areas, scheduled monuments, registered parks and gardens) as well as non-designated gems such as locally listed buildings or historic assets that emerge only once the planning wheels start turning. And don’t forget their setting; what surrounds an asset can matter just as much as the asset itself.

These places aren’t just “nice to have”, they’re protected by law, and the National Planning Policy Framework (NPPF) gives their conservation Great Weight. That means that any change to a heritage asset resulting from a development has to be handled with care, or the project timetable (and budget) can take an unwelcome hit. Of course, the heritage itself doesn’t cause delays. A lack of foresight, however, definitely does. Here are the five biggest culprits and more importantly, how to avoid falling into their very old, very inconvenient traps.

Contributors:

Virginia Brewer

Partner, Head of Heritage

1. The “Oh No, It’s Listed?!” Moment

We’ve all seen it: the late realisation that a listed building, conservation area or other heritage asset is part of your site (or just nearby). Cue the submission being held back, a frantic scramble to commission a heritage statement, and a chain reaction of redrafting other documents to reflect heritage constraints. It’s the planning equivalent of discovering you’ve been building on quicksand.

Likely delay: 4–24 weeks.
Avoid it by: doing early checks. Very early.

2. Assuming Anyone Can Write the Heritage Report

Letting your architect or planner “sort the heritage bit” may seem cheaper and quicker, but the NPPF clearly states that applicants must describe the significance of every affected heritage asset, including its setting. That requires proper research: historical records, architectural analysis, archaeological context… the works. Underestimating the level of specialist input needed can stall applications and unravel design assumptions.

Likely delay: 4–12 weeks.
Avoid it by: commissioning a proper heritage significance and impact assessment upfront.

3. Dodging Early Engagement (Until It Bites Back)

For more complicated schemes, skipping a pre-application advice from the Local Authority or not engaging with other key stakeholders such as Historic England may seem like a timesaver - right up until they object. And when consultees push back, you may be looking at redesigns, redocumentation or even a brand-new application.

Likely delays:
• Revising the application after negative feedback: 5 –20 weeks
• Submitting an entirely new, amended application: 4–12 months

Avoid it by: talking to consultees early. They’re not the enemy - they’re your route to approval.

4. Treating Heritage as an Afterthought in Design

A beautiful, expensive design that later proves incompatible with heritage constraints is a painful (and costly) lesson. Archaeological assessments, heritage advice or structural surveys of historic buildings often reveal issues that force changes to layout, massing, materials or methods. If heritage isn’t informing the design from the outset, it will disrupt it later.

Likely delay: 8–32 weeks.
Avoid it by: embracing heritage-led design from day one.

5. Forgetting That Heritage Law Is, Well… Law

Assumptions about what you can or can’t change on a historic building can lead to unintentional offences - yes, actual criminal offences. On top of this, there’s no time limit on slapping an enforcing notice on an owner to reinstate or regularise unauthorised works to listed buildings, and the offence stays with the building, not with the culprit. Retrospective consent is slow, complex and far from guaranteed. Enforcement appeals can drag on for years.

Likely delay: 6 months – 2 years.
Avoid it by: knowing your responsibilities—and getting advice before touching anything.

How to Keep Your Scheme Moving Smoothly

The best shortcut? Start early. Get heritage advice at preacquisition or preconcept stage. A competent heritage consultant will flag constraints and opportunities before they become problems. A great one will also engage stakeholders early, negotiate on your behalf, and help build heritage considerations into the foundations of your scheme, not bolt them on later.

Most importantly, treat heritage as a driver of design quality rather than a hurdle—when integrated properly, it can unlock value instead of causing delay.

Get in touch

Virginia Brewer

Partner, Head of Heritage

With a background as a Chartered Surveyor, Virginia appreciates and understands the commercial pressures of development in terms of costs and timescale.

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