Planning Permission in Slough | A Homeowner’s Guide Before You Build
If you’re planning building work in Slough, understanding planning permission rules is one of the most important steps before your project begins. Whether you’re considering a home extension, loft conversion, garden room or major renovation, getting the planning stage right can save time, money and unnecessary stress.
With Slough continuing to see strong demand for family housing, many homeowners are choosing to improve their existing properties rather than move. This guide explains planning permission in Slough, how Permitted Development works, and what you need to know before building in 2025.
Do You Always Need Planning Permission in Slough?
No — not all building work requires planning permission. Many home improvement projects can be completed under Permitted Development (PD) rights, provided they meet specific national guidelines.
However, planning requirements in Slough can vary depending on:
- The type of property
- The size and design of the project
- Whether the property is in a conservation area
- Previous extensions or alterations
Because of this, it’s always wise to confirm requirements before starting work.
What Is Permitted Development?
Permitted Development allows homeowners to carry out certain types of work without submitting a full planning application, as long as size, height and design limits are respected.
Projects that may fall under Permitted Development include:
- Single-storey rear extensions (within size limits)
- Certain loft conversions
- Garage conversions
- Internal alterations
- Garden rooms and outbuildings
Even if planning permission is not required, Building Regulations approval is still mandatory.
When Is Planning Permission Required in Slough?
You will usually need planning permission if your project involves:
1. Double-Storey Extensions
Planning permission is almost always required for:
- Double-storey rear or side extensions
- Large extensions that exceed PD limits
- Extensions close to property boundaries
These developments are more likely to affect neighbouring properties.
2. Side or Front Extensions
Side extensions, particularly two-storey builds, typically require planning approval. Front extensions almost always need permission due to their impact on the street scene.
3. Properties in Conservation Areas
Some areas of Slough have additional planning controls. If your property is in a conservation area:
- Permitted Development rights may be restricted
- Design and materials are more tightly controlled
Always check local policies before finalising designs.
4. Listed Buildings
If your property is listed, you will need:
- Planning permission
- Listed Building Consent
This applies to most internal and external alterations.
5. Significant External Alterations
Planning permission may also be required for:
- Large dormer loft conversions
- Changes to roof shape
- External cladding or rendering
- Major alterations to windows and doors
Do Loft Conversions Need Planning Permission in Slough?
Many loft conversions fall under Permitted Development if:
- Volume limits are not exceeded
- The conversion does not extend beyond the front roof slope
- Materials match the existing property
Planning permission may still be required for:
- Hip-to-gable loft conversions
- Large rear dormers
- Homes in conservation areas
Regardless of planning permission, Building Regulations approval is always required.
Do Garden Rooms Need Planning Permission?
Most garden rooms do not require planning permission if:
- They are single-storey
- Height limits are respected
- They are not used as separate dwellings
- They do not cover more than 50% of the garden
Planning permission may be needed for larger structures or properties with restricted development rights.
Planning Permission vs Building Regulations
It’s important to understand the difference:
- Planning permission controls what you can build
- Building Regulations control how it is built
Building Regulations approval is required for:
- Structural work
- Foundations
- Insulation and energy efficiency
- Fire safety
- Electrical and plumbing installations
Even if planning permission is not required, Building Control approval still applies.
How Long Does Planning Permission Take in Slough?
Typical planning timescales include:
- Householder applications: around 8 weeks
- More complex applications: up to 13 weeks
Delays can occur if:
- Plans need revision
- Additional information is requested
- Neighbour objections are raised
Proper preparation helps avoid unnecessary delays.
Common Planning Mistakes Homeowners Make
Some of the most common mistakes include:
- Assuming planning permission isn’t required
- Starting work before approval is granted
- Ignoring conservation area restrictions
- Submitting low-quality drawings
- Not considering neighbour impact
These mistakes can result in refused applications or enforcement action.
How a Local Slough Builder Can Help
An experienced local builder can:
- Advise whether planning permission is required
- Work with architects and planning consultants
- Ensure designs meet local planning policies
- Coordinate Building Regulations approval
- Help avoid costly delays and redesigns
Local knowledge is particularly valuable when navigating Slough’s planning requirements.
Final Thoughts
Understanding planning permission in Slough before you build is essential for a smooth and successful project. While many home improvements fall under Permitted Development, larger extensions, loft conversions and external alterations often require approval.
Whether you’re planning a house extension, renovation or garden room, getting professional advice early can save time, money and stress — and help ensure your project progresses without unnecessary setbacks.