Loft Conversion in Portsmouth


Loft conversions are becoming increasingly popular in Portsmouth as more homeowners want to maximise the space in their homes without opting for expensive extensions or moving to larger properties. Our loft conversion builders in Portsmouth can help add significant value to your property, increase the living space and create additional room in your home.  

Loft Conversions in Portsmouth
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Loft Conversion in Portsmouth

Types of Loft Conversions

Velux or Roof Light Loft Conversion

This is the most straightforward type of loft conversion, which involves adding skylights or roof windows to the existing loft space. This cost-effective way to create more light and space does not usually require planning permission.

Dormer Loft Conversion

The most common type of loft conversion, it extends the roof outwards to create additional space.

A dormer loft conversion typically involves adding a flat-roofed box structure to the back or side of the roof. Dormers can be designed in various shapes and sizes and include multiple windows to bring in more natural light.

Hip-to-Gable Loft Conversion

This type is best suited for buildings with a hipped roof. The process entails transforming the sloping side of the roof into a vertical gable end, generating more headroom and space. It adds a larger bedroom or more living space to the property.

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Mansard Loft Conversion

This more complex type involves complete altering of the roof structure. It typically involves raising the party wall shared with your neighbour and creating a steep roof on one side of the property. These conversions almost always require planning permission.

Modular Loft Conversion

A modular loft conversion is a type of loft conversion that involves using pre-fabricated modular units to create additional living space in the loft. Unlike traditional loft conversions constructed on-site, modular loft conversions are built off-site and transported to the property for installation.

Modular loft conversions are popular for homeowners who want to minimise disruption and speed up the conversion process. The modular units are built in a factory-controlled environment, ensuring consistent quality and reducing delays due to inclement weather.

The modular units can be designed to match the property’s existing style. They may include windows, doors, and insulation to ensure a warm and energy-efficient space. Once the modules are transported to the property, they can be installed quickly and easily, usually in just a few days.

Loft Conversion
Velux Loft Conversions
Hip-to-Gable Loft Conversions
Dormer Loft Conversion
House Extension
Garage Conversion
Mansard Loft Conversions
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Planning Permission

Most loft conversion ideas in Portsmouth do not need planning permission and fall under permitted development rights. However, there are certain restrictions in place:

  • The maximum extension height of 50 cubic metres for detached and semi-detached properties and 40 cubic metres for terraced properties is allowed.
  • The extension should not exceed the size of the existing roof
  • The materials utilised must be consistent with those of the existing property.

Building Regulations

All modern loft conversions in Portsmouth must comply with building regulations to verify they are safe, structurally stable, and meet health and safety standards. These regulations cover various aspects of the conversion, such as insulation, fire safety, ventilation, and the stability of the structure. A building control officer inspects the work throughout the process to ensure compliance.

Structural Requirements

Loft conversions can put a lot of strain on the existing structure of your property, so it is vital to ensure that the design can support the new load, for which you may consult with a structural engineer and ascertain the requirements.


We are also extremely proud to say that we have formed a partnership with Tree-nation and will be planting 100 trees for every loft conversion we build.

We feel it is our responsibility to put back into the environment what we take out and play a role in creating a sustainable world for future generations.

Cost of Loft Conversion

The cost of a loft conversion depends upon several factors, including the project’s complexity, the materials used, the property’s location and your loft conversion company in Portsmouth.

As a rough estimate, our loft conversion contractors in Portsmouth can help carry out the conversion between £15,000 and £25,000, while more complex projects with higher-end finishes and bespoke features may cost up to £40,000.

To get an accurate idea of the cost of a loft conversion in Portsmouth, contact us as your loft conversion specialists in Portsmouth for a detailed quote based on your specific needs.