One of the most common questions homeowners ask when considering a loft conversion in Reading is:
‘Do I need planning permission?’ The good news is that many loft conversions can be completed under Permitted Development Rights, which means you won’t need to apply for planning permission at all. However, there are important exceptions and conditions that every Reading homeowner should understand.
At Blenheim Constructions, we guide our clients through the planning process every step of the way. In this blog, we’ll explain when planning permission is required, when it isn’t, and how to ensure your loft conversion complies with all regulations.
Permitted Development Rights: What Are They?
Permitted Development Rights allow homeowners to carry out certain types of building work without needing to submit a planning application to the local authority. Loft conversions often fall under these rights, provided they meet specific criteria set out by the government.
Key Point: Even if your loft conversion qualifies for Permitted Development, you’ll still need to comply with Building Regulations, which are separate and mandatory for all loft conversions.
When Do You NOT Need Planning Permission for a Loft Conversion in Reading?
Most loft conversions in Reading fall under Permitted Development and do NOT require planning permission if they meet the following conditions:
- The Roof Height Does Not Increase
The highest part of your roof must remain the same. This means you cannot raise the ridge line or extend the roof upwards. Dormer windows that sit below the ridge line are generally acceptable under Permitted Development.
- Additional Volume Is Within Limits
There are strict limits on how much volume you can add:
- Terraced houses: Up to 40 cubic metres
- Detached and semi-detached houses: Up to 50 cubic metres
Important: This volume limit includes any previous extensions or alterations made to your property since 1948.
- Materials Match the Existing Property
The materials used for the loft conversion (roof tiles, brickwork, cladding, etc.) must be similar in appearance to the existing house. This ensures the conversion blends seamlessly with your property’s original design.
- Side-Facing Windows Are Obscure-Glazed
Any windows on the side elevation of your loft conversion must be:
- Obscure-glazed (frosted or opaque glass)
- Non-opening, unless they are at least 1.7 metres above the floor level
This rule is designed to protect the privacy of neighbouring properties.
- No Verandas, Balconies, or Raised Platforms
You cannot add verandas, balconies, or raised platforms to your loft conversion under Permitted Development. These features would require planning permission.
- The Property Is Not a Flat or Maisonette
Permitted Development Rights for loft conversions only apply to houses. If you live in a flat or maisonette, you’ll need planning permission for any loft conversion work.
When DO You Need Planning Permission for a Loft Conversion in Reading?
While many loft conversions qualify for Permitted Development, you will need to apply for planning permission in the following situations:
- Your Property Is a Listed Building
If your home is a listed building, you’ll need
Listed Building Consent in addition to planning permission. The local authority will assess whether the proposed loft conversion would adversely affect the building’s historical character or architectural integrity.
- Your Property Is in a Conservation Area
If you live in a conservation area, there are stricter rules around alterations to your property. Dormer windows or roof extensions visible from the street may not be allowed under Permitted Development, and you may need to submit a planning application.
- Permitted Development Rights Have Been Removed
In some areas of Reading, the local authority has removed Permitted Development Rights through an
Article 4 Direction. This means that even standard loft conversions require planning permission. You can check with Reading Borough Council to see if your property is affected.
- The Loft Conversion Exceeds Volume Limits
If your proposed loft conversion adds more than 40 cubic metres (terraced) or 50 cubic metres (detached/semi-detached) of volume to your property, you’ll need planning permission.
- You’re Raising the Roof Height
If you plan to increase the height of your roof to create more headroom, this will require planning permission. Raising the roof ridge is not covered under Permitted Development.
- You’re Adding a Balcony, Veranda, or Raised Platform
As mentioned earlier, these features automatically require planning permission.
What About Building Regulations?
Even if your loft conversion doesn’t need planning permission, it
always requires Building Regulations approval. These regulations ensure that the work is structurally sound, energy-efficient, and safe.
Building Regulations cover:
- Structural stability (floor joists, roof structure, load-bearing walls)
- Fire safety (escape routes, fire-resistant doors, smoke alarms)
- Thermal insulation and energy efficiency
- Staircase design and compliance
- Ventilation and natural light
- Sound insulation (particularly in semi-detached or terraced properties)
At Blenheim Constructions, we handle all Building Regulations applications, inspections, and certifications on your behalf, ensuring full compliance throughout your loft conversion project.
How to Check if You Need Planning Permission
If you’re unsure whether your loft conversion requires planning permission, here’s what to do:
- Check Your Property Type
Is your property a house, flat, or listed building? Is it located in a conservation area?
- Review Previous Extensions
Have you added any extensions or alterations since 1948? If so, these will count towards your volume allowance.
- Contact Reading Borough Council
You can contact the planning department at Reading Borough Council to confirm whether your property is subject to any restrictions such as Article 4 Directions.
- Consult a Professional
The easiest and most reliable way to determine whether you need planning permission is to consult an experienced loft conversion specialist like Blenheim Constructions. We’ll assess your property, review local planning rules, and advise you on the best course of action.
Applying for Planning Permission: What’s Involved?
If your loft conversion does require planning permission, here’s what to expect:
- Submit a Planning Application
You’ll need to submit detailed drawings, plans, and supporting documents to Reading Borough Council. This includes elevations, floor plans, and a design and access statement.
- Neighbour Consultation
The council will notify your neighbours and give them an opportunity to comment on your application. This process typically takes 21 days.
- Decision Timeline
The council has 8 weeks to make a decision on your application. They may approve it, approve it with conditions, or reject it.
- Cost
Planning application fees vary depending on the type and scale of the work. As of 2025, a householder planning application in England costs around £258.
At Blenheim Constructions, we can manage the entire planning application process on your behalf, including preparing drawings, liaising with the council, and addressing any concerns raised by neighbours or planning officers.
Why Choose Blenheim Constructions for Your Reading Loft Conversion?
Navigating planning permission and Building Regulations can be complex, but with Blenheim Constructions, you’re in safe hands. We offer:
- Expert advice on planning requirements and Permitted Development Rights
- Full Building Regulations compliance on every project
- Professional planning application support if needed
- Transparent communication throughout the process
- High-quality craftsmanship and attention to detail
We take the stress out of loft conversions, ensuring your project is compliant, beautifully executed, and hassle-free.
Get Expert Planning Advice for Your Reading Loft Conversion Today
Unsure whether you need planning permission for your loft conversion? Contact Blenheim Constructions today for a free consultation. We’ll assess your property, explain your options, and handle all the paperwork so you can relax and enjoy your new living space. Visit
https://blenheimconstructions.co.uk/ or call us to get started.