For a home extension, new dwelling, change of use, or land development, you will usually need both. The good news is that the distinction is straightforward once you know what each plan is meant to communicate.

Location plan vs site plan: the key difference

A location plan shows where your property or land sits within the surrounding area. It is a wider-context map, normally based on licensed Ordnance Survey mapping, with the application site clearly marked in red.

A site plan, also called a block plan in many UK planning applications, focuses much more closely on the site itself. It shows the land, buildings, access, boundaries, nearby properties, and other details that help the planning authority understand the proposed work on the ground.

Put simply, a location plan answers, “Where is the site?” A site plan answers, “What is on the site, and what is changing?”

Both are mapping documents, but they should not be treated as interchangeable. A location plan gives the planning authority geographic context. A site plan provides the detail needed to assess relationships with neighboring land, roads, trees, parking, and access.

What a location plan should show

A location plan covers a broad enough area for the site to be easily identified in its neighborhood or rural setting. For most planning applications, the usual scale is 1:1250 in built-up areas or 1:2500 for larger or more rural sites. At these scales, the map should include enough surrounding roads, buildings, and features to make the location unmistakable.

The application site should be outlined with a red line. If you own or control adjoining land, a blue line is generally used to identify that land. This is particularly relevant for larger plots, phased developments, access routes, or projects where land outside the red-line area is connected to the proposal.

Your location plan should also be current, clearly scaled, and centered so that the red boundary is visible without sitting too close to the edge of the page. A map that is too tightly cropped can make it difficult to understand access or the relationship to nearby streets.

For example, if you are applying for a rear extension to a semi-detached home, the location plan will show the house within the surrounding streets and properties. It is not intended to show the extension design in detail. That belongs on the site plan and architectural drawings.

Why the red boundary matters

The red line is not simply a marker around the building where work will take place. It should normally cover the full application site, including relevant garden areas, parking spaces, access, and land needed to carry out or operate the proposal.

For a straightforward extension, this may be the entire residential plot. For a new home on a former garden plot, it may include the proposed access and parking area. Drawing the boundary too narrowly is a common mistake, especially where access, drainage, or landscaping extends beyond the new building footprint.

What a site plan should show

A site plan provides a closer view, usually at 1:200, 1:500, or sometimes 1:1000, depending on the size and complexity of the proposal. The scale should be large enough for a planning officer to read the information clearly without making the drawing unnecessarily large.

It should show the existing layout of the site and clearly identify the proposed work. That may include the position of existing and proposed buildings, site boundaries, neighboring buildings, roads, footpaths, driveways, parking spaces, gates, walls, and trees.

The exact detail depends on the project. An extension site plan may show the existing house, the extension footprint, garden boundaries, and nearby homes. A new-build proposal may need a much fuller layout, including vehicle access, turning space, bin storage, landscaping, cycle parking, and distances to boundaries.

Where relevant, a site plan can also show the direction of north, levels, drainage features, public rights of way, protected trees, and the position of any demolition. The aim is not to overload the drawing. It is to include the details that help the planning authority assess the application without guessing.

Existing and proposed details must be clear

A good site plan makes a clear distinction between what is already there and what is proposed. Labels, hatching, line styles, or a simple legend can help, provided the drawing remains easy to read when printed or viewed on screen.

If a garage will be removed, show that. If a new driveway will be created, show its position and connection to the road. If a boundary fence is moving, identify both the existing and proposed line where practical. These details can affect privacy, access, highways safety, drainage, and the impact on neighboring properties.

Which plan do you need for your application?

Most householder and full planning applications ask for both a location plan and a site plan. However, local planning authorities can set their own validation requirements, so it is sensible to check the relevant application guidance before submitting.

A simple proposal may need only a basic block plan alongside a location plan. A larger development, listed building project, or proposal affecting trees, flood risk, highways, or protected land may require additional drawings and reports. The mapping remains the starting point, but it cannot replace detailed elevations, floor plans, design statements, or technical surveys where those are required.

If you are unsure, think about the information a reviewer needs. If they need to find the property, use a location plan. If they need to see the proposal in relation to the plot and its surroundings, use a site plan. If they need to understand the building itself, provide architectural drawings as well.

Common mistakes that can slow validation

Planning departments do not reject maps because they expect graphic design perfection. They do need plans that are legible, accurately scaled, and suitable for making a decision. Problems usually arise when the required information is missing or unclear.

Common issues include using an online screenshot rather than properly licensed mapping, omitting the scale, failing to mark a north point on a detailed plan, or drawing an incomplete red boundary. Another frequent problem is using a plan that is too old or too low-resolution to read property outlines and road names.

A site plan can also cause confusion when proposed work is not labeled. A highlighted rectangle may make sense to the applicant, but it may not tell a planning officer whether it represents an extension, a shed, a new home, or a parking area.

Do not assume a plan accepted for one project will be right for another. A small rear extension and a new house on land behind an existing property have very different mapping needs, even if they share the same address.

Choosing the right scale

Scale is one of the most practical parts of preparing planning maps. A larger denominator shows a wider area with less detail, while a smaller denominator gives a closer, more detailed view.

A 1:1250 location plan is often suitable for a typical residential property because it gives enough neighborhood context. A 1:2500 plan may work better for rural land, farms, or extensive sites. For site plans, 1:500 is widely used because it shows property boundaries and neighboring features clearly. A 1:200 plan is useful where fine detail matters, such as a compact urban plot or a close relationship with adjoining buildings.

The best scale depends on the site. A plan should show enough of the surroundings to explain the proposal, but not so much that the important details become too small to read.

Preparing compliant maps without extra delay

Start by identifying the full land area associated with your application, not just the building work. Then select a location plan that gives suitable context and a site plan scale that shows the relevant site features clearly. Mark the red and blue boundaries carefully, add annotations only where they assist understanding, and check that every label remains legible.

For applicants who need professional mapping quickly, UK Planning Maps provides licensed Ordnance Survey MasterMap-based location and site plans in standard planning scales. You can search by address, postcode, coordinates, or map position, draw boundaries, and download the finished PDF immediately. That is useful when an application deadline is close, but it also helps experienced professionals keep repetitive mapping work moving.

Before you submit, compare your plans with the planning authority's validation checklist and your architectural drawings. The boundaries, access points, building positions, and proposed works should all tell the same story.

A clear location plan gets your site recognized. A clear site plan gives the proposal its proper context. Taking a few extra minutes to match each plan to its purpose can save far more time once your application reaches the validation desk.