Planning permissions are a vital piece of the puzzle that ensures our developments align with local guidelines and contribute positively to our communities.
Planning Permission in 2025
Embarking on a construction or renovation project is a thrilling prospect, but navigating planning permission can often feel like a daunting task. From our experience, we’ve found that one of the most common questions we get asked is, “How long is my planning permission actually valid for?”. It’s a question with significant implications, as the answer can directly impact the timeline and success of any building project.
Planning permission isn’t just a rubber stamp; it’s a vital piece of the puzzle that ensures our developments align with local guidelines and contribute positively to our communities. However, what many people don’t realise is that planning permissions come with a shelf life. This lack of awareness can lead to unexpected hurdles, costly delays, and even the need to reapply, setting projects back significantly. We’ve encountered numerous situations where individuals have mistakenly believed their planning permission would last indefinitely. This assumption can have serious ramifications, potentially throwing entire projects into disarray and leading to substantial financial losses. That’s precisely why we believe it’s so important to clarify this topic and give you the knowledge you need to successfully navigate the world of planning permission.
The Standard Validity Period
Generally speaking, in the UK, full planning permission typically lasts for three years from the date it’s granted. This means you’ve got three years to get the ball rolling and commence the development. It’s important to note that “commencing” doesn’t mean the whole shebang needs to be finished within that time; it simply means that some “material operation” needs to have begun.
It is worth noting that local planning authorities can set different time limits when granting planning permission. So, in some instances, they might allow a longer period, while in other instances, they may shorten it, depending on circumstances. Therefore, always read your planning permission documents to understand the specific conditions and time frames applicable to your project.


Why Timely Action is Key
Because planning permissions have a limited lifespan, it’s vital to act swiftly after you’ve got the go-ahead. If you delay starting your project, you risk your permission expiring, which would mean you’d need to reapply. This can be a real headache, as planning policies and local circumstances could have changed since your original application, potentially affecting your chances of getting approval again.
Over the years, we’ve seen plenty of cases where clients have lost valuable time and money because their planning permission expired. It’s a situation that can be easily avoided with proper forward-thinking and planning. We always tell our clients to make a practical timeline for their projects, accounting for possible hold-ups, and making sure that work starts well within the validity period.
What About Extending Planning Permission?
If you’re nearing the end of your planning permission’s lifespan and haven’t started work yet, don’t despair. There are ways to potentially extend your permission, however this will involve reapplying before the original permission expires.
One option is to apply for planning permission again, for the same development, retaining the benefit of the original permission, whilst also potentially incorporating any changes you might want to make to the original plans


Understanding 'Lawful Commencement'
Knowing what “lawful commencement” actually means is key to keeping your planning permission valid. This basically refers to the actions that legally count as the start of your development. It’s more than just popping by the site or doing a bit of prep work; you need to carry out a “material operation” as defined by planning law.
Typical material operations include things like digging foundations, laying pipes, or building a road for access. It’s crucial that any work you do to start the development is substantial and clearly linked to the approved plans. There have been instances where developers thought they’d started, only to find out that their actions didn’t meet the legal mark for “material operation”, leading to their planning permission expiring.
Keep a Record of When You Start
Once you’ve started work on your development, it’s really important to keep good records. This acts as proof that you started within the validity period of your planning permission. We suggest taking dated photos of the work, keeping detailed notes of what’s been done, and perhaps even letting the local planning authority know you’ve commenced.
In our experience, keeping detailed records has been a lifesaver in situations where the start of development has been questioned. It gives you a clear paper trail that can protect you from potential arguments or challenges to your planning permission’s validity.
Understanding how long planning permissions last is a must for anyone starting a development project. By knowing the time limits, acting fast, and making sure you commence and document everything properly, you can sidestep the dangers of expired permissions and bring your project to life within the rules.

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At A9 Architecture, our projects serve as a testament to our commitment to bringing architectural visions to life. Each endeavour highlights our expertise and the unique solutions we provide to meet our clients’ goals. From bespoke residential designs and innovative commercial spaces to functional outbuildings and vibrant public areas, our diverse portfolio showcases the breadth of our work. We take pride in our meticulous attention to detail and dedication to quality, ensuring that every project not only meets but exceeds expectations. Explore our projects to see how we have brought architectural visions to life. Each project highlights our expertise and the unique solutions we provide to meet client goals. These examples showcase our diverse range of work and commitment to quality.
The intention is to create 6-bedroom 2 storey property with 3 gables and balcony to the front elevation and single-storey rear wrap-around with central courtyard and landscaping on the site.
The proposed design achieves Georgian period architecture to the front & flank elevations of the two-storey element and a contemporary style to the single-storey rear.
The proposed application seeks the approval to create a single storey dwelling within a pitched roof over to the rear of 262 Outwood Common Road. The proposed site would have an area of 462.2m2 which would achieve off road parking of 183.3m2, front amenity space of 45.3m2, a rear amenity space of 113.6m2 and a proposed footprint of 86.8m2.
The dwelling would then achieve an enclosed front amenity space which would provide access to the dwelling front door that is located centrally. The rear amenity space is then located within the north of the site which would also be enclosed by a public footpath and natural woodland.
The front entrance is location of the north elevation centrally within the property. On entering the property an open plan kitchen, dining and social living area is located to the south east section of the dwelling. This would have a set of bi-fold doors located to the north east elevation leading out onto the private amenity space. The dining area and kitchen will be located centrally and to the south east section on the building with combined floor area achieving 30 m2. The family bathroom would achieve disabled standards and be located adjacent the existing kitchen 8 containing all the utility in one area of the proposed dwelling. A corridor to the south elevation of the dwelling will the provided access to the two proposed bedrooms. High level windows will be located to the south elevation providing natural light and ventilation when desired. A double bedrooms will then be located onto the north west elevation of the site achieving a floor area of 15.6 m2 with a windows overlooking the front amenity space. The second bedroom is to be a single with a proposed floor area of 9.1m2.
The surrounding context comprises of two storey dwelling with an approximate ridge height of 8.5 metres. However the site is located at the lowest point within the surrounding context. The proposed ridge height of the dwelling is to be 4.6 metres in height with an eaves height of 2.8 metres.
Outwood Common Road comprises of a variation of material with the prominent being facing brick. In addition to the facing brick, render, cladding and hanging tiles with interlocking roof tiles. The surrounding driveways are made of concrete, tar mac, permeable paving or unbonded materials.
Permission is sought for the removal of the garage block and the erection of three detached bungalows. These would have an overall height of approximately 5.4m and a mixture of brick, render and clay roof tiles as the external materials.
Extrodinary Design by A9
Salient
by ThemeNectar
Why You Should Choose A9 Architecture
Choosing A9 Architecture means choosing a team of dedicated professionals committed to delivering remarkable results. Our architects and designers are passionate about their work and take pride in every project. With a focus on customer satisfaction, we ensure every project meets our clients’ needs and preferences. A9 Architecture is standing by to discuss your project and discover how we can help bring your vision to life. We offer no-obligation quotes, contact us today.