Shell loft conversions

A shell loft conversion offers you the dream loft. Easy to customise, affordable and spacious - paired with a super-efficient timescale. Find out more on the, costs and how to get an instant quote.

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What is a Shell loft conversion?

A shell loft conversion provides the structural framework and external features, like roofing and windows, but leaves the interior unfinished for homeowners to customise. This method is cost-effective compared to full loft conversions that include complete internal finishes.

The main advantages are lower initial costs and the flexibility for homeowners to personalise the interior. The potential for substantial cost savings and tailored design options is a significant benefit.

How much does a Shell loft conversion cost?

The cost of a shell loft conversion in the UK can vary depending on several factors, such as location, size, and the complexity of the project. Generally, the cost of a loft conversion ranges from £10,000 to £30,000. Here’s our shell loft conversion experts' breakdown of the costs:

Loft Conversion Cost Ranges
Range Estimated Cost (£) Description
Lower Range £10,000 - £17,500 This covers the basic structural work, including reinforcing the roof and floor, installing basic windows and external doors, and ensuring the space is watertight. This is suitable for smaller projects or areas with lower labour costs.
Middle Range £17,500 - £22,500 Includes more extensive structural work and basic utilities such as rough electrical wiring and plumbing. This range is ideal for mid-sized projects where additional structural modifications are necessary.
Upper Range £22,500 - £30,000 At this level, you can expect comprehensive structural work, higher-quality materials for roofing and windows, and the inclusion of more complex installations like steel beams for additional support. This is suitable for larger projects or areas with higher living costs, such as London.

Shell loft conversion cost calculator

Estimating the cost of a shell loft conversion can help you plan your budget effectively. This section provides a straightforward tool to calculate the expenses, considering factors like structural work, roofing, windows, and basic utilities.

Use this calculator to get a clear idea of the potential costs and make informed decisions for your project.

Estimated Cost: £0

*For an exact quote from trusted professionals, please use our quoting tool to get a quick, accurate cost.

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What is included with a shell loft conversion?

A shell loft conversion includes essential structural work and external features, preparing the space for the homeowner to customise internally. Here’s what typically comes with a shell loft conversion:

  • Structural framework: The conversion includes reinforcing the roof, floor joists, and walls. This ensures the loft is structurally sound and can support the additional load.
  • Roofing and insulation: New roofing materials protect the loft from the elements. Basic insulation is also added to improve energy efficiency and comfort.
  • External windows and doors: Dormer windows, skylights, or other external windows bring natural light into the space. Necessary external doors provide access and security.
  • Staircase installation: A basic staircase provides safe and convenient access to the new loft space. This is crucial for integrating the loft with the rest of the home.
  • Making the space watertight: Ensuring the loft is watertight protects the new space from weather damage. This includes sealing any potential leaks and installing proper drainage systems.
  • Basic utilities: Rough electrical wiring and plumbing installation are completed if applicable. This prepares the space for future finishes and makes it easier to add utilities later.
  • Planning and building regulation compliance: All work must conform to necessary building regulations in England. Permits are obtained to ensure the conversion meets legal standards and safety requirements.

*Our guide on building compliance and regulations will help you understand the basics of planning permission and compliance in detail.

The process of a shell loft conversion

A shell loft conversion transforms your loft into a usable space by completing essential structural work and external features. This process leaves the interior unfinished for you to customise. Here’s a breakdown of the steps involved, from planning to completion.

Loft Conversion Project Timeline
Stage Description Expected Timescale
Initial consultation and planning Meet with a design consultant to discuss needs, possibilities, and budget. 2-4 weeks
Obtaining permissions Submit necessary applications if planning permission is required. 4-8 weeks
Preparation Conduct a full site survey to plan the conversion and ensure all materials are ordered. 1-2 weeks
Structural work Reinforce the framework with new beams, joists, and supports as needed. 3-6 weeks
Installation of external features Install dormer windows, skylights, or other windows, and roof alterations if required. 2-3 weeks
Making the loft watertight Ensure the roof and windows are fully sealed to prevent water ingress. 1-2 weeks
Basic utilities Install rough electrical wiring and plumbing needed for the loft. 1-2 weeks
Compliance and final checks Conduct final inspections to ensure all work complies with building regulations. 1 week

How long does a shell loft conversion take?

A shell loft conversion typically takes 8 to 12 weeks to complete. However, this timeframe can vary depending on several factors, including the design's complexity, the condition of the existing loft, and the need for structural reinforcements.

Loft Conversion Project Timeline
Stage Description Expected Timescale
Initial consultation and planning Meet with a design consultant to discuss your needs and preferences. Determine if planning permission is required. Draw up and approve architectural plans. 2-4 weeks
Obtaining permissions Submit applications if planning permission is needed. Often done under permitted development rights. Ensure all work meets UK building regulations. 4-8 weeks
Preparation Conduct a full site survey to plan the conversion. Erect scaffolding for safe access and protection during construction. 1-2 weeks
Structural work Reinforce the framework with new beams, joists, and a suspended floor. Install new roofing materials and basic insulation for protection and energy efficiency. 3-6 weeks
Installation of external features Install dormer windows, skylights, or other windows for natural light. Fit necessary external doors for access and security. Install a basic staircase for safe loft access. 2-3 weeks
Making the loft watertight Seal any potential leaks and install proper drainage systems to ensure the loft is weatherproof. 1-2 weeks
Basic utilities Install rough electrical wiring and plumbing to prepare for future finishes. 1-2 weeks
Compliance and final checks Ensure all work adheres to UK building regulations. Obtain permits and conduct inspections to meet safety and legal standards. 1-2 weeks
Handover for internal finishing Hand over the project to the homeowner for internal work, including plumbing, plastering, electrical installation, and second-fix carpentry. Varies based on homeowner's schedule

Benefits of a shell loft conversion

When considering a shell loft conversion, you must consider the drawbacks and the benefits. Here our experts explain the benefits of a shell loft conversion:

  • Cost-effective: Lower initial costs compared to full loft conversions.
  • Flexibility: Homeowners can design and finish the interior according to their budget.
  • DIY potential: Ideal for those with DIY skills or who want to manage their project.
  • Customisation: Allows for personalised interior design and finishes.
  • Quicker initial build: Structural and external work is completed faster, leaving interior work for later.
  • Budget management: Spread costs over time by completing the interior work in phases.
  • Increased property value: Adds usable space, increasing the property's value.
  • Personal satisfaction: Provides a sense of achievement by completing part of the project yourself.
  • Control over quality: Homeowners can choose their materials and tradespeople for the interior work.
  • Energy efficiency: New insulation improves the home's energy efficiency.
  • Planning permission ease: Often falls under permitted development, simplifying the approval process.

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How customisable is a shell loft conversion?

Our loft conversion experts are asked regarding a Shell loft conversion: How customisable are they?

The answer is: A shell loft conversion is highly customisable.

Here are the key aspects of customisation:

Interior layout and design

A shell loft conversion offers a high level of customisation. You can tailor the space to your needs and preferences. With the interior left unfinished, you can decide on the room configurations, whether you need extra bedrooms, a home office, or a playroom.

This flexibility extends to choosing the types of flooring, wall finishes, and ceiling designs, allowing you to match the new space with your home's decor.

Utilities and fixtures

A shell loft conversion includes rough installations for electrical wiring and plumbing. You can decide the exact locations and types of electrical outlets, lighting fixtures, and plumbing fittings. 

This is especially useful if you plan to install a kitchen or bathroom in the loft. You can also choose your preferred heating solutions, such as underfloor heating or radiators, and the type of insulation that meets your energy efficiency goals.

Windows and natural light

You have significant control over the placement and style of windows. Custom window placement, including skylights and dormer windows, allows you to maximise natural light and ventilation, enhancing the loft's ambience and energy efficiency.

Staircase design

The staircase is crucial in a loft conversion. The basic staircase provided can be upgraded or replaced with a design that suits your taste. Options include spiral staircases, space-saving stairs, or custom-built designs that match your home's style.

Sustainable and eco-friendly options

Sustainability is a crucial consideration when customising a shell loft conversion. You can opt for eco-friendly materials for flooring, insulation, and finishes, contributing to a greener living space. This includes using recycled materials, low-VOC paints, and energy-efficient windows.

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