Planning changes 2026: what it means for your home extension
As we move into Summer 2026, changes to the planning system are beginning to take shape – and they’re likely to affect how homeowners approach home extensions and alterations in the years ahead.
For a long time, there has been a fairly common approach to householder applications. Designs would often start slightly larger or more ambitious, with the expectation that planners might request changes along the way. It wasn’t always the most efficient route, but it did allow a degree of flexibility as proposals developed.
But that approach is becoming far less viable.
Earlier this week, we were invited to attend a Planning Agent’s Forum at South Derbyshire District Council. It was a valuable opportunity to be in the room with both planning officers and other professionals working in this space, discussing how the system is evolving and the challenges on all sides. We genuinely appreciated the opportunity to be part of that conversation, and we hope it’s something that continues – because open dialogue like this is an important part of improving the process for everyone involved.
We’ve been working in architectural design for over 10 years now, supporting homeowners across the East Midlands, and one thing has become increasingly clear: what should be a straightforward process for improving your home is, in many cases, becoming harder to navigate.
At The Practical Planning Company, we’ve always believed in helping everyday homeowners create the space they deserve. But the question we’re beginning to ask is whether changes like these are making that goal easier to achieve – or slowly pushing it further out of reach.
So, what’s actually changing? And what does it mean for people simply trying to improve their homes? Read on to find out (it’s a long one so stick with us!)…
Quick questions about home extensions (UK)
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Quick questions about home extensions (UK) -
If you’re thinking about extending your home, these are some of the most common questions we’re asked:
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Start by understanding what you need from your space, then speak to an experienced designer or architect to assess feasibility, budget and planning requirements before progressing any designs.
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Most extensions in 2026 range between £40,000 and £100,000+, depending on size, specification and complexity.
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Not always. Some extensions fall under permitted development, but many require formal planning approval depending on size, location and design.
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You are not legally required to appoint one, but working with an experienced, local architectural designer can significantly improve your chances of approval and reduce risk.
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From initial design to completion, most extension projects take between 6–12 months, depending on scale and complexity.
Why is planning permission becoming more difficult?
Before looking ahead, it’s worth recognising the current reality. Planning authorities across England are managing high volumes of applications, often with limited resources. In early 2025, more than 90,000 applications were submitted in a single quarter, while the number of decisions being issued fell compared to previous years.
Planning authorities across England are managing high volumes of applications, often with limited resources. In early 2025, in a single quarter, while the compared to previous years.
At the same time, delays are still a common frustration. While the statutory target for most applications is eight weeks, many homeowners experience much longer wait times – sometimes several months – before receiving a decision. And yet, despite these challenges, around 87% of applications are approved nationally.
So, the issue isn’t simply whether applications are successful. It’s the experience of getting there.
For many homeowners, that experience can feel uncertain, inconsistent, and at times unnecessarily complex – something we have seen first-hand when supporting clients through the process.
In the early years of our practice, it was far more common to work through proposals collaboratively with planning officers, resolving concerns, refining designs, and arriving at a solution that worked for everyone. Increasingly, that journey feels less open.
And for homeowners, that can make what should be an exciting project feel like a risk.
A more fixed approach to decision-making
The proposed changes aim to address part of this. Councils are working towards determining applications as they are submitted, within the eight-week statutory period, with less opportunity for changes once the application has been validated.
In principle, this should lead to faster decisions and a more streamlined process. But it also changes how applications need to be approached.
The more informal process – where designs evolve through ongoing dialogue – is becoming less common. If a proposal doesn’t align with policy from the outset, the result is more likely to be a refusal, rather than a revised solution.
Can I still extend my home easily in 2026?
In practice, this places more responsibility at the very start of the process. Applications need to be well thought through, clearly justified, and aligned with local policy before they are submitted. For most projects, this means:
Extensions that are clearly subservient to the original property
The use of materials that match or complement the existing house
Designs that have minimal impact on neighbouring homes
These principles are nothing new. But what is changing is how strictly they are applied – and how little opportunity there may be to refine things once submitted. And when you consider that many extensions now cost £40,000 to £100,000+, and can add 10–20% to a property’s value, the importance of getting this right becomes clear.
For many of the homeowners we work with, this isn’t about pushing the limits for the sake of it. It’s about creating a kitchen that actually works for family life, adding a bedroom for a growing household, or making better use of the space they already have.
These are everyday ambitions. And yet the process around achieving them can increasingly feel anything but straightforward.
A better process – or a more demanding one?
It would be easy to view these changes as purely restrictive. But the reality is slightly more nuanced. A system that delivers quicker, clearer decisions has obvious benefits. Delays often lead to increased costs, disruption, and uncertainty for homeowners.
However, one of the long-standing challenges within the planning process has not just been speed, but communication. Where applications fall short, it is often not because they are fundamentally unacceptable, but because there hasn’t been an opportunity to resolve concerns early or collaboratively. In some cases, relatively small changes could make a proposal acceptable, but without that dialogue, the result is refusal and reapplication.
This is something we have consistently raised in our wider work – because ultimately, the planning system should support residents in improving their homes, not create avoidable barriers.
That’s something we care deeply about. Because when the process becomes harder to navigate, it’s not developers or large-scale projects that feel it most – it’s everyday homeowners trying to improve their living space.
And that raises an important question about who the system is ultimately working for.
Where pre-application advice becomes more important
As a result, more of the focus now sits at the beginning of the process. Pre-application advice is likely to play a larger role, helping to identify potential issues before anything is formally submitted. Government guidance already highlights that early engagement can improve the quality of applications and increase the likelihood of approval.
When it works well, this can:
Reduce delays
Avoid unnecessary costs
Provide clearer direction from the outset
However, its effectiveness is not always consistent. Pre-application advice is not a statutory requirement, which means access to early guidance can vary – influenced by council resources, internal processes and local demand.
In some cases, what is intended to create a smoother, more predictable process can still leave homeowners facing uncertainty before they have even submitted an application.
So, is this a positive change?
That largely depends on how it is implemented. If it leads to clearer guidance, faster decisions and more consistent outcomes then it has the potential to significantly improve the experience for homeowners.
But if flexibility is reduced without improving communication, there is a risk of more refusals, more reapplications, and ultimately increased costs.
As is often the case with planning, the outcome is unlikely to be entirely one or the other – and will depend on how consistently these changes are applied in practice.
For us, this is what it ultimately comes back to. The planning system plays a vital role in protecting the quality and character of our built environment – but it should also enable people to adapt their homes in a way that supports modern living.
The challenge is finding that balance, without losing sight of the people at the centre of it.
Where do I start if I’m planning a home extension?
Our advice at PPCo…
If you’re considering extending or improving your home, seeking the help of an experienced designer or architect has never been more important. Taking the time to properly develop your design, understand local policy and seek professional advice at the outset can make a significant difference – not just to the outcome, but to the overall experience, all the way through from planning to construction.
Done well, the process doesn’t need to feel uncertain or frustrating. It can be clear, structured and ultimately rewarding.
Thinking about a home extension in 2026 or beyond?
If you’re based in the East Midlands and want to explore ideas for your home, we’re here to help. We offer free, no-obligation design consultations to talk through your options, advise on planning requirements, and help you develop a scheme that works both practically and creatively.
We also continue to support wider conversations around improving the planning process – because it should be fair, accessible and genuinely supportive of homeowners.
Common questions about extending your home
Is it harder to get planning permission now than before?
In many cases, yes. The process is becoming more fixed, with fewer opportunities to revise applications once submitted.
What causes planning applications to be refused?
Typically, issues around scale, impact on neighbours, or conflict with local planning policy.
Is extending still worth it in 2026?
In many cases, yes. Extensions can significantly improve how your home works while adding long-term value.
Can I extend my home on a £50k budget?
Possibly, depending on size and specification — but early advice is essential to understand what’s achievable
In simple terms, extending your home in 2026 is still very achievable – but it now requires clearer thinking, better preparation and the right guidance from the very start.
Call us on 07743 686654 or email hello@practicaplanningco.co.uk. We’re always happy to talk through your ideas and help you take the next step.