How long does planning permission actually take? The honest answer for a householder application in the North West is around eight weeks from valid submission, plus the time it takes to prepare the drawings and sort out any pre-application advice. Building regulations approval runs in parallel for some routes and afterwards for others, so the total paperwork lead time before any work starts is typically 10 to 14 weeks for an extension and shorter for jobs that fall under permitted development.
Most homeowners we meet underestimate this stage. Drawings get talked about as if they take a fortnight, and the council is treated as a rubber stamp. Neither is true. This guide sets out the real timelines, the routes most projects take, and how to keep the paperwork moving while the build remains achievable.
The two permissions, and why they are not the same
Planning permission and building regulations are two separate consents. Planning permission deals with whether you are allowed to build something in a particular spot: the size, the look, the impact on neighbours, the use of the land. Building regulations deal with how it is built: structural safety, insulation, ventilation, fire, drainage, energy. A project can need one, both, or sometimes neither, and the routes are independent.
Permitted development rights cover a surprising amount of work. Many single-storey rear extensions, garage conversions, porches and outbuildings can be built without a planning application as long as they sit within set limits. The Planning Portal’s common projects pages set out the limits clearly, and we always check the specifics against the actual property before promising a homeowner a permitted route.
Building regulations apply to almost any structural, drainage or habitable work, regardless of whether planning permission is needed. That includes garage conversions, loft conversions, RSJ installations, knock-throughs, new windows in some cases, and any extension. The application is made through your local authority building control or an approved inspector, and inspections happen at set stages of the build. We manage this end-to-end on every job we run, because the paperwork trail is part of the value of the work.
Realistic timelines for the most common projects
A householder planning application has a statutory determination period of eight weeks. In practice that runs from validation, not submission, and validation can take a week or two if drawings need clarification. Add two to four weeks for design and submission preparation, and you are at 10 to 14 weeks for the planning stage of an extension or two-storey extension. Larger projects or sites in conservation areas can run longer.
Building regulations approval can be sought through a Full Plans application or a Building Notice. Full Plans takes around five weeks for sign-off and is the safer route for any structural work because the local authority approves the design before construction starts. A Building Notice allows work to begin without prior approval and is suitable only for minor jobs. Either way, inspections happen on site at foundation, structural, drainage, insulation and completion stages.
Permitted development projects skip the planning stage entirely, but a Lawful Development Certificate is a sensible safety net. The certificate confirms in writing that your work falls within permitted development, which protects you on resale. Determination usually takes around eight weeks. The cost is low, and the peace of mind is worth it when planning a renovation in stages.
Where the timeline most often slips
Validation delays. A planning application is only “live” once validated, and councils kick back applications with missing drawings, incomplete location plans or unclear ownership certificates. A good architect or builder submits a complete pack first time, but it pays to check.
Neighbour comments. The neighbour consultation period inside the eight weeks is when objections land. Most do not change the outcome, but a clean conversation with neighbours before submission avoids surprises. If the project is near a shared boundary, the Party Wall etc. Act 1996 may also come into play, and that has its own notification timeline of one to two months.
Conditions on approval. Many planning approvals come with conditions to discharge, such as approving materials, drainage or landscaping plans. These need to be discharged before the relevant stage of work, not at the end. Missing this is one of the most common reasons a build stalls in week six.
Building control on site. Inspections need to be booked, not assumed. We give 48 hours notice for the critical stages, and we plan the trades around the inspection slots. This is part of why a project manager matters: the inspector is not chasing you, and the work does not stop for paperwork.
How to keep the paperwork from costing you the summer
Three habits make the difference. First, get a builder involved before the drawings are finalised. We have stopped projects being over-designed at the planning stage by flagging what is impractical to build before the application goes in. Second, treat May as the planning month for a late-summer or autumn build, and start the design conversation now. Third, decide your route honestly: do you need a full planning application, or are you genuinely within permitted development?
Most of our extensions and structural projects across the North West follow the same pattern: site visit, brief, drawings, planning or LDC submission, building regulations Full Plans, builder selection, start on site. Mixing the order or skipping a step is what stretches a 12-week paperwork stage into 20.
Frequently Asked Questions
How long does planning permission actually take for an extension?
A householder planning application has a statutory eight-week determination period from validation. In practice, allow 10 to 14 weeks from first drawings to decision when you include design time and validation. Larger or more complex projects can run longer, particularly in conservation areas.
Do I need planning permission for a single-storey rear extension?
Often no, if the extension falls within permitted development limits on size, height, materials and proximity to boundaries. We always check the specifics against your property because rules vary by house type and any Article 4 directions in place locally.
What is a Lawful Development Certificate and do I need one?
It is a written confirmation from the council that your project falls within permitted development. It is not legally required, but it is strongly recommended because it gives certainty and protects you on resale. The determination period is around eight weeks.
Can building regulations approval happen at the same time as planning?
Yes. The two consents are independent, so you can submit building regulations Full Plans in parallel with the planning application. We usually advise doing exactly that, because it avoids the dead weeks waiting for one decision before submitting the next.
What happens if I build something without permission?
Enforcement action can require you to alter or remove the work, and unauthorised work shows up on a buyer’s solicitor search. Retrospective applications are possible but not guaranteed to be approved. The safer, cheaper route is to get permission first.
Who actually applies for the permissions?
You can apply yourself, or your architect, designer or builder can apply on your behalf. We handle building regulations submissions and inspections directly for every project we manage, and we work alongside designers and architects on planning applications.
Permissions are not the exciting part of a renovation, but they are the part that decides whether you start in August or January. If you want a straight answer on what your project actually needs, get a site visit booked and we will map the route through with you.
