Getting the right paperwork together is the first step towards planning permission for your extension in London. Missing files can make an application invalid, which means the council will not start assessing it until the problem is fixed.
Most householder applications need an application form, the fee, a location plan, a block plan, floor plans, elevations and an ownership certificate. Some projects also need a Design and Access Statement, a Heritage Statement or extra reports.
Our specialists can help you steer clear of the errors that slow applications down. Book your free consultation with us today.
Essential Documents for a Planning Application in London
These are the documents most homeowners need when applying for house extension planning permission in London.
Councils need accurate site location maps first. A location plan shows your property outlined in red, with any other land you own outlined in blue. Measured floor plans show your existing room layouts, and proposed elevations show how the new design will look. A block plan marks your property boundaries accurately.
| Document | What it is | When you need it |
|---|---|---|
| Application form | The form with your details and a description of the proposal | Every application |
| Application fee | The fee set for your type of application | Every application, unless an exemption applies |
| Location plan | A map showing your property outlined in red | Every application |
| Block (site) plan | Shows boundaries and the position of the new work | Most applications |
| Existing and proposed floor plans | Show the current and new room layouts | Most extensions |
| Existing and proposed elevations | Show the outside of the building before and after | Most extensions |
| Ownership certificate | Confirms who owns the land (Certificate A, B, C or D) | Every application |
| Design and Access Statement | Explains your design choices | Larger or more complex projects and listed building applications |
| Heritage Statement | Explains the effect on a historic building | Listed buildings and many conservation area cases |
| Flood risk assessment | Assesses flood risk on the site | Some sites in higher flood risk zones |
Your council may also publish its own local list of requirements, so it is worth checking before you submit.
Qualified planning consultants in Croydon and across London prepare precise drawings. Our experts measure your property dimensions with care. We create professional layouts that match council standards.
Clear documents show how your build meets local rules. Scaled drawings help planning officers understand the proposed heights.
Councils will not start assessing an incomplete submission. Avoiding an invalid planning application can save you weeks. Our guidance helps make sure your submission includes every required form.
You gain confidence when professionals manage your paperwork. Missing ownership certificates, for example, delay council validation checks.
Statements You May Need: Design and Access, Heritage
Submitting correct forms requires careful attention to detail. A Design and Access Statement explains your project goals and design choices.
A Heritage Statement applies when a property is listed or sits in a conservation area. Our guide to understanding listed building consent explains this in more detail. Written statements help justify the proposed changes to local planners.
Follow these planning permission tips before you submit:
- Check your council’s local validation list for extra documents
- Draw every plan to a recognised scale
- Include the application form, the fee and the correct ownership certificate
- Add a Design and Access Statement or Heritage Statement if your project needs one
- Compare your submission against the national requirements on the Planning Portal
Our team brings four years of hands-on planning experience. We carry full public liability insurance for your peace of mind.
HB Planning Services can act as your official agent. We deal directly with the council’s planning officers, handle the council portals for you and respond promptly to any officer queries. That leaves you free to focus on your project while we deal with the paperwork.
How London Boroughs Check Your Application
Different boroughs enforce their own local planning policies. London extensions need knowledge of urban restrictions, and our designers understand the guidelines of individual councils across London.
We conduct thorough property surveys before drawing plans. Precise measurements help prevent costly mistakes during construction. Detailed technical packs support your builder on site.
What Makes a Planning Application Invalid?
An invalid application means the council cannot start assessing it because something is missing or incorrect. A refused application means the council has assessed it and decided against it. Invalid applications can usually be fixed by supplying the missing items, which is why getting the documents right first time matters. You can read more in our guide to the reasons a planning application is marked as invalid.
Incomplete paperwork is the main reason applications are marked invalid. Many homeowners overlook the required block plans and location drawings. Drawings at the wrong scale are usually marked invalid by planners. Our professional planners check all drawing scales before submission. By working with experts you avoid costly validation delays. Securing planning permission in London can be a drawn-out process. Planning officers handle hundreds of applications across all boroughs.
With clearly defined drawings, officers can identify the details of your application more easily, which supports a smoother process. Incomplete or messy hand sketches slow the council process down. Our professional CAD drawings make a good first impression and show professionalism. Some sites need extra reports. Flood risk assessments, for example, may be required in higher-risk flood zones, and larger schemes can need further assessments. Your council may ask for these reports before validating your application. Identifying special requirements from the outset saves you valuable time and effort. We provide a complete technical service to cover every part of your application.
After Planning: What Building Regulations Need
Securing planning permission is the first hurdle, but your extension will also need building regulations approval. Structural calculations show that your building is safe and stable. Technical drawings take your builder through the construction process. Full building plans also help your building control inspector assess the work smoothly. Clear technical drawings can prevent lost time on site and delays to your build. Builders work more efficiently when technical details are clear, so less work is halted while instructions are clarified.
Our team prepares the building regulations documents you need to apply for approval efficiently. We work closely with structural engineers to produce detailed calculations for all steelwork. Fire safety is given particular attention in all our projects. You will get a complete technical drawing set to take to site, and HB Planning Services will support you throughout the build.
Conclusion
With proper documentation, your project is better placed for a smooth council review. Our team will handle your application professionally and aims to keep delays to a minimum.
Request your free consultation from HB Planning Services to get started with your property development today.
FAQs
What documents do councils need for extensions?
Most councils ask for an application form, the fee, a location plan, a block plan, floor plans, elevations and an ownership certificate. Some projects also need extra statements or reports.
Why do applications become invalid so often?
Missing forms, the wrong fee, drawings at the wrong scale or incorrect boundary lines are common causes. The council cannot start assessing an invalid application until these are fixed.
How do consultants help secure council approval?
Consultants prepare precise drawings that follow local rules and check that your submission is complete before it goes to the council. This helps your application be assessed without avoidable delays.
Do I need a design and access statement?
Not always. Larger or more complex projects and listed building applications usually need one, and a Heritage Statement is often needed for listed buildings and conservation areas. Check with your council.
How long does local council approval take?
Councils usually aim to decide householder applications within eight weeks of validation, although complex cases can take longer.
Can HB Planning Services act as my agent?
Yes. Our team can manage all council communication for you.
