If you are considering creating an additional bedroom, home office or living space, the likely cost will naturally be one of your first questions.
There is no single price that applies to every loft conversion. The final cost will depend on your property, the type of conversion, the structural work required and your chosen specification.
Visit our pricing page to view our current starting prices for each conversion type. For an accurate cost based on your home, we also provide a free property survey followed by a detailed, no-obligation quotation.
How Does the Conversion Type Affect the Cost?
The type of loft conversion you need will have a significant effect on the overall quotation.
Velux Loft Conversion
A Velux conversion uses the existing roof space, with roof windows added to provide light and ventilation. As the main roof shape is retained, it may involve less building work than other conversion types.
This option is most suitable when the loft already has sufficient headroom and usable floor space.
Dormer Loft Conversion
A dormer conversion extends outwards from the roof slope, creating additional headroom and a more practical room shape.
The size of the dormer, number of windows and internal layout will all influence the final cost.
Hip-to-Gable Loft Conversion
A hip-to-gable conversion replaces the sloping side of a hipped roof with a vertical wall. It may be suitable for detached, semi-detached and end-of-terrace properties.
This type of conversion involves structural changes to the roof and is often combined with a rear dormer to maximise the available space.
L-Shaped Dormer Loft Conversion
An L-shaped dormer combines two connected dormer sections. It is generally suited to period or terraced homes with an existing rear addition.
The additional floor space may allow for a principal bedroom with an en-suite, a bedroom and office, or two separate rooms.
Mansard Loft Conversion
A mansard conversion involves more extensive changes to the roof structure. Its steep sides can create a generous amount of full-height living space and make the conversion feel like a natural additional floor.
The structural work, planning requirements and larger internal area will all contribute to the final quotation.
What Other Factors Affect Loft Conversion Costs?
The conversion type is only one part of the overall price. Other important factors include:
- The size, shape and condition of the existing roof
- Structural steelwork and floor strengthening
- The design and position of the staircase
- The number and style of windows
- Plumbing and drainage for an en-suite
- Insulation and ventilation
- Heating, lighting and electrical work
- Bespoke cupboards and other joinery
- Flooring, decorating and interior finishes
- Scaffolding and access to the property
- Planning and Building Regulations requirements
A property survey allows these elements to be assessed before an accurate quotation is prepared.
Does the Intended Use of the Loft Affect the Price?
Yes. A straightforward bedroom or home office will have different requirements from a principal suite with an en-suite bathroom, bespoke wardrobes and premium finishes.
Before requesting a quotation, consider:
- How many rooms you need
- Whether you would like a bathroom
- How much storage is required
- The preferred number and position of windows
- Your lighting and heating requirements
- The standard of interior finish you want
Making these decisions during the design stage helps ensure the quotation reflects the finished room you actually want.
Will Planning Permission Add to the Cost?
Many loft conversions can be completed under permitted development rights, provided they meet the relevant conditions. Others may require a planning application because of their size, design or location.
Different requirements may apply to listed buildings, conservation areas and properties where permitted development rights have been restricted.
Building Regulations approval will still be required when converting a loft into habitable accommodation. Your quotation should clearly explain the planning, design and Building Regulations support included.
What Should a Loft Conversion Quotation Include?
A detailed quotation should define the agreed work and specification. Depending on the project, this may include:
- Survey and design
- Structural calculations
- Planning support where required
- Building Regulations
- Scaffolding and site preparation
- Structural and roofing work
- Staircase installation
- Windows and insulation
- Plumbing and electrics
- Plastering and decorating
- Project management
- Final completion and sign-off
When comparing quotations, check what is included rather than looking only at the total. A lower quotation may exclude work or finishes included elsewhere.
How Can You Get an Accurate Loft Conversion Cost?
An online estimate can provide an initial indication, but every property must be assessed individually before a complete price can be confirmed.
During a property survey, we will inspect the roof space, consider the available headroom and assess the likely structural requirements. We will also discuss how you want to use the room and the level of finish you would prefer.
You will then receive a detailed, no-obligation quotation based on the proposed design and specification.
Get a Loft Conversion Quotation
Bigger Living Lofts combines more than 30 years of industry experience with a complete design and build service.
Our team can manage your project from the initial survey and structural calculations through to planning support, construction and completion.
View our current starting prices on our pricing page, call 01732 523199, or request an online estimate to get started.