Concept illustration of a traditional brick and timber-framed cottage with a contemporary glazed rear extension, set within a garden

Concept artwork — proposed sympathetic extension

Listed Buildings & Conservation

Protection changes what's possible. It doesn't have to stop it.

Owning a listed building or a property in a conservation area doesn't mean nothing can change — it means changes have to be understood and justified differently. We help owners across Milton Keynes and the surrounding area assess significance, setting and risk before proposing anything, so the right route is clear from the start.

This page is for anyone whose building or site carries a heritage designation — a listed building, a conservation area, or both — and needs to understand what that actually means before changing anything, extending, or dealing with work that's already happened.

I own a listed building
My property is in a conservation area
I want to extend a historic home
I need consent for alterations
I have unauthorised works to regularise
I need heritage advice before submitting

Listed & protected

How do you change a sensitive building without harming its character or risking refusal?

Before any design work begins, a sensitive building needs to be understood on its own terms — what makes it significant, how its setting contributes to that significance, and what a conservation officer will realistically accept. Proposing changes before this is understood is the most common way a good idea becomes a refused application, or unauthorised work that has to be regularised after the fact.

Listing status
Conservation area designation
Significance
Setting
Materials
Scale and massing
Historic fabric
Visibility from public realm
Previous unauthorised works
Conservation officer risk
Planning history

Decision diagram: how a proposal for a historic or protected building is assessed for impact on significance and setting, to identify the right route forward.

Every building and every setting is different, so the first step is understanding what yours can support.

Our approach

We check feasibility before full drawings.

Rather than proposing a design first, we start by assessing what makes your building or area significant — its historic fabric, setting and any prior planning history — before recommending the right approach and consent route. Structural, heritage and Building Regulations considerations happen alongside the design, not after it, so nothing discovered late forces a resubmission or a revised strategy.

Once the right approach is clear, here's exactly what happens next.

Concept illustration of a side extension shown as a massing overlay on an existing Georgian brick house

How it works

What happens once you get in touch.

Initial Discussion

Understanding your building, its designation, and what you're hoping to achieve, before discussing the right approach forward.

Feasibility

Typically 1–2 weeks — assessing significance, setting and prior planning history, and identifying the likely consent route, before any design work begins.

Design Development

Initial ideas are refined into a proposal that responds to the building's significance, planning requirements and your brief.

Planning

Listed building consent, planning permission, or both — most listed building consent applications have an eight-week determination period from validation, although complex or linked applications can take longer.

Technical Design

Building Regulations drawings and structural coordination, prepared sensitively so construction can proceed with confidence.

Construction Support

Where required, we continue supporting the project during construction, helping resolve design queries as they arise.

With the process clear, here are the questions we're asked most often.

Common questions

Questions about protecting what makes your building special.

Do I need Listed Building Consent?

Listed Building Consent may be required for internal or external works that affect the building's special architectural or historic character, regardless of whether planning permission is also required. Any effect on the listed building's setting is considered separately, through the planning process rather than Listed Building Consent itself. Carrying out unauthorised works to a listed building without consent is a criminal offence, not just a planning breach, which is why we check this before any design work begins.

Can I extend a house in a conservation area?

Often, yes, but Permitted Development rights are more restricted inside a conservation area than elsewhere, and the design has to respond to the area's character, not just your own plot. We assess what your specific conservation area actually requires before assuming any rule applies.

What happens if works were carried out without consent?

Unauthorised works require careful, case-specific advice. The local authority may invite an application seeking consent to retain the works, require alterations or reinstatement, pursue listed building enforcement, or consider prosecution. Any consent granted later does not remove potential liability for carrying out the original works without consent. We handle this calmly and directly, focusing on the most appropriate route to address the unauthorised works.

What is a Heritage Statement?

A Heritage Statement assesses the significance of a heritage asset and explains how a proposal may affect it. It's normally required for listed building consent applications, and is often required where a planning proposal affects a conservation area, a listed building or another heritage asset — the level of detail should be proportionate to the proposal. We prepare these as a normal part of the process, not as a separate, optional extra.

Will the conservation officer object?

It depends on the specific proposal and how well it responds to the building's significance — there's no blanket answer. Early, informal engagement with the conservation officer, before a formal application, is usually the most reliable way to find out and to adjust the approach if needed.

Can modern design work on a historic building?

Yes — contemporary interventions are often more successful, and more readily accepted, than pastiche imitation, provided they're clearly legible as new work and respect the building's scale, materials and setting. We treat this as a design opportunity, not a constraint to work around.

If a situation like this looks familiar, here's what it can look like once it's resolved.

Related projects

We've done this before.

Exposed roof timbers and a sash window looking out over Warwick's historic town centre, mid-way through refurbishment works

Retrospective PlanningConservation AreaWarwick

Retrospective Refurbishment in Warwick Conservation Area

Preparation of a retrospective planning application and heritage documentation for refurbishment works to a property within the Warwick Conservation Area, including liaison with the local planning authority and consultant team.

See our current work

Watercolour concept illustration of a stone period building with a contemporary glazed extension

Conservation AreaPendingLocation TBC

Future case study

Project details will be published once the work reaches a suitable stage and client approval allows it.

Every one of these started with the same understanding-first conversation.

What you'll know before arranging heritage advice.

Whether your building or area carries a heritage designation, and what that actually restricts.
Whether your proposal is likely to respect the building's significance, or needs rethinking.
What consent route applies, and roughly how long it takes.
What the next step should be, whatever your building's history.

Let's find out what's possible.

Heritage advice is the fastest way to know what your building or site can support, before you commit to a design.

Arrange heritage advice Send an email

Heritage advice is focused on understanding your building's significance and identifying the most realistic approach forward — whatever that turns out to be.