Roof Lift Loft Conversion Cost

Would you like to know the cost of a loft conversion with a roof lift?

A roof lift loft conversion — sometimes referred to as a roof conversion or raising the roof — can be an excellent solution for homes with limited loft headroom, allowing for additional living space or even an extra bedroom. You can expect to pay between £55,000 and £90,000, depending on several factors.

In the UK, roof lift conversions are gaining popularity, particularly in areas with higher property values. The roof conversion cost varies based on the type of property, the amount of lift required, and the chosen finish. For growing families, this type of conversion can provide the additional space needed without the disruption of relocating.

We’ll help you understand the benefits of this type of loft conversion and how much you can expect to pay.

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Whether you’re building your dream family home with a loft or converting an existing attic, we can help you calculate costs below!

How Much is a Roof Lift Loft Conversion?

Compared to an extension, a roof lift loft conversion is affordable for many. By utilising the existing space in your property, rather than investing in materials to build a new structure, these types of attic conversions are often preferred.

On average, you can expect to pay between £55,000 and £90,000 for a loft conversion with a roof lift, although prices will vary depending on the type of property and the complexity of the conversion.

Due to the nature of the work required for a roof lift loft conversion, you can expect to pay much more than for a standard loft conversion. This is due to the extra structural work that must be carried out, which encompasses raising the ridge height of your roof. To achieve this, a significant portion of the existing roof must be removed and then rebuilt.

Roof Lift Loft Conversion Prices

A partial roof lift raises a section of the roof — typically gable to gable — to create usable head height. A raised ridge with pitch adjustment increases the ridge height with a steeper roof angle, while a full roof replacement involves removing and rebuilding the entire structure. If you want to maximise floor space as well as headroom, a combination roof lift and dormer is worth considering.

Optional Extras

As well as upgrading the loft insulation or carrying out any additional structural work at the same time as your conversion, there are several optional extras worth suggesting. These can help enhance your lift loft conversion, and really help to elevate your project into a living space to be proud of:

• Rooflights (£500 – £1,200)
• Roof windows (£800 – £1,500)
• Built-in storage (£1,000 - £2,000)
• Bespoke staircase (£2,000 - £4,000)
• Juliet balcony (£2,500 - £5,000)
• En-suite bathroom (£4,000 – £6,000)
• Dormer addition (£10,000 - £20,000)

Once you're loft is ready, you can decorate the room and add any other fixtures and fittings as required.

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Roof Lift Loft Conversion Supply Costs

The materials required for a roof lift loft conversion are extensive, ranging from structural supports to insulation and windows. The table below gives a quick overview of typical supply costs, with more detail on each item further down.

Structural Framework

Your roof lift loft design will either require steel beams or timber trusses in order to support the new roof. Steel is the more costly option, at £2,000 - £3,500, but may be necessary, especially if your attic is to be open planned.

Windows

Depending on whether you install rooflights or windows, prices will vary. For a typical Velux skylight window, prices range between £300 and £600 per piece. On the other hand, a more complex, dormer loft window can cost up to £3,000. Of course, size and finishes will always impact the final price, so keep this in mind.

Ventilation Systems

All loft conversions require a safe, working ventilation system. For instance, if you’ve installed a bathroom, an extractor fan will be required. Depending on the final ventilation system you choose, expect to pay up to £1,000 for a fit-out.

Plasterboard

Plasterboard is a highly versatile construction material and will be used across the interior of the attic. Prices for plasterboarding sit between £10 and £15 per m².

Roofing Tiles and Slats

In cases where the entire roof is being replaced, you will need to pay for new roofing slats or tiles. There is a wide range of options, with varying costs. However, basic roofing tiles are priced between £20 and £30 per m², with more premium options being up to three times this amount.

Insulation

To comply with energy efficiency building regulations, insulation is essential. Mineral wood and rigid board insulation are the two most popular options, ranging from £20 to £50 per m².

What Makes Up the Cost of a Roof Lift Loft Conversion?

Beyond the core conversion work, several other expenses contribute to the total cost. Here's a breakdown of what to budget for:

• Professional fees (architect) — Most roof lift loft conversions require planning permission and detailed drawings. Working with an experienced architect typically costs between £600 and £2,000, depending on your location and project complexity.
• Professional fees (structural engineer) — A structural engineer will assess your home's existing structure and advise on the works required to support the new roof. Structural engineer fees typically range from £400 to £1,500.
• Building control inspection — You'll need a building control inspection to confirm the works meet building regulations. Expect to pay between £300 and £750 — your local authority can provide more detail on the specific requirements.
• Internal fittings (plumbing and electrics) — Any internal fit-out costs — such as plumbing for an en-suite bathroom or new electrical work — should be factored in separately. Review cost guides for bathrooms, plumbing, and electrics to build a more accurate overall budget.
• Waste disposal — Responsible disposal of construction materials is a legal requirement. Skip hire in the UK typically costs between £200 and £500, depending on your location and the volume of waste.
• Temporary accommodation — Because a significant portion of the roof is removed during the conversion, you'll likely need to vacate the property. Budget for temporary accommodation for the duration of the structural work.
• Party wall agreement — If your property shares a wall with a neighbour — for example, in a terraced or semi-detached home — you may need a party wall agreement before work can begin. Surveyor fees for this typically range from £700 to £1,000 per neighbour.

Labour Costs for Roof Lift Loft Conversions

Labour is a significant part of the overall roof lift loft conversion cost, typically accounting for around 40% of the total on a basic build — though this rises to around 60% on more complex projects or larger properties. In the UK, weekly labour costs for a project of this scale generally range from £1,000 to £2,500, depending on the trades required and the size of your team.

Labour costs in London and the South East tend to be higher than the national average, due to the increased cost of living in those areas.

A roof lift loft conversion requires several different trades across the course of the project. While it's possible to arrange each tradesperson yourself, most reputable contractors at this scale will include project management within the overall price. Always request a detailed written breakdown in your quote to avoid unexpected charges.

Builders handle all structural work, including roof removal and reconstruction. Roofers are responsible for raising the roof and tiling the new structure. Joiners install interior elements such as floor joists and staircases. Electricians, plumbers, and decorators complete the fit-out once the structural work is finished.

Timeframes for Loft Lift Conversion

It is helpful to know what to expect in terms of the timeline for any significant construction project. Here’s a typical timeline for a roof lift loft conversion project in the UK.

Generally, this type of loft conversion will take anywhere between 4 and 8 weeks. It’s also important to consider that adverse weather conditions can significantly delay conversion projects.

• Planning and Design Stage – The planning stage, which involves the assistance of an architect and a structural engineer and the application for planning permission, can take anywhere between 2 and 6 weeks.
• Construction – Once you have all of the prerequisites in place, it’s time for construction to commence. Raising the roof on any property is a lengthy process, so you should expect this stage to take between 4 and 8 weeks in total.
• Fit-out – Once the roof has been raised and the conversion is complete, you can add any finishing touches and fit out the space. This includes installing electrics, fitting flooring, plumbing any bathrooms, and so on. This process typically takes between 2 and 4 weeks.
• Finishes and Considerations – Where the design of your roof lift loft conversion is complex, expect a longer timeline. The same can be said for works carried out during colder seasons, when adverse weather is more likely.

However, in the event you live in a listed building or within a conservation area, you should expect the initial planning process to take several weeks longer. This is due to requiring additional permission in this situation, that may also require further consultations.

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Cost Factors for Roof Lift Loft Conversions

Several factors determine the overall roof lift conversion cost. Understanding these will help you build a more accurate budget before seeking quotes.

• Property location — Labour and material costs vary across the UK. Conversion projects in London and the South East will typically cost more than those in other regions.
• Size and structure of the existing roof — Complex roof designs — such as hipped roofs — require more labour and materials than a straightforward pitched roof, increasing the overall cost.
• Amount of lift required — A minor lift will generally fall within the average cost ranges. A full roof replacement, where the entire structure is removed and rebuilt, will push costs toward the higher end.
• Internal specification — The type of fixtures, fittings, and finishes you choose will have a significant impact on the final price. A basic fit-out for storage use costs far less than a fully finished bedroom with an en-suite.
• Planning permission and structural complexities — If your project requires planning permission or involves structural challenges — such as a party wall agreement or unusually shaped loft space — additional fees for design and engineering work may apply.
• Type of property — Detached properties generally offer the most straightforward conversion. Semi-detached homes may require a party wall agreement, and terraced houses can have structural limitations that affect the feasibility and cost of raising the roof.

Building Regulations Related to Roof Lift Loft Conversions

In the UK, there are a number of regulations that govern the safety and structural integrity of loft conversions. Since roof lift loft conversions are deemed more complex than standard loft conversions, full planning permission is often necessary.

The process of increasing the height of a property’s roof is considered to be an alteration to the external profile. This means that the work is not permissible under permitted development rights.

In any case of doubt, you should consult with your local planning authority to get a clear idea of whether full planning permission is required.

Building regulations to consider:

To help you gain a full picture of which regulations are applicable to roof lift loft conversions, we’ve created a list with explanations below.

1. Structural Integrity

The structural integrity of your property is determined by a structural engineer. They will advise on the works required to support the new roof's structure. During this assessment, they will check walls, foundations, and any other structures to verify compliance with building regulations. Structural engineer fees typically range from £400 to £1,500.

2. Fire Safety

Fire safety is a major consideration across UK construction projects, and fire regulations apply to every floor of a property. When you convert a loft to a habitable room, it must have smoke alarms installed, and fire escapes must be considered. Upgrading to fire-rated doors where required typically costs between £200 and £500 per door, including fitting.

3. Insulation

Energy and insulation are regulated in the UK; for this reason, the loft conversion must be insulated to standard to meet the current energy efficiency regulations. Insulation materials typically cost between £20 and £50 per m², depending on the type used.

4. Stairways

Any new staircases that are built to allow access to the attic must be safe in terms of headroom, riser height, and tread depth. A standard staircase typically costs between £1,000 and £3,000, while a bespoke design can reach £4,000 or more.

Types of Roof Lift Loft Conversions

There is a range of roof lift loft conversion designs available, and some contractors may offer a bespoke service depending on your property’s existing structure. As with any construction job, there are a number of factors to consider, such as your budget, planning permission, and complexity.

Below, you’ll find a list of the various styles of roof lifts and a description to help you plan your project.

Gable to Gable Roof Lifts

A gable-to-gable lift will raise the entire ridge height and create two gable end walls. This results in a box structure that replaces the sloped roof. Many terraced homes feature this type of roof lift conversion as internal space isn’t affected.

The cost range for a gable-to-gable roof lift is between £50,000 and £80,000, and planning permission is generally required.

Raised Ridge Conversions

With a raised ridge roof lift conversion, there's an increase within the height of the existing roof ridge. This type of conversion is best suited to a semi-detached or detached property, where the loft space requires minimal work as it doesn't impact the pitch of the roof.

Planning permission is almost always required, and you can expect to pay between £40,000 and £70,000 for this type of work.

Full Roof Replacements

A full roof replacement involves removing the old roofing structure entirely and replacing it with a taller roof system.

This option is best for those willing to pay a higher cost, as the price for such a job can easily exceed £90,000.

Bungalow Roof Lift

A bungalow roof lift is one of the most common types of roof conversion in the UK. Because bungalows are single-storey properties, a roof lift offers the opportunity to add an entirely new floor without extending the footprint of the home. This makes it a popular choice for homeowners who want significantly more living space without relocating.

The bungalow roof lift cost tends to sit toward the higher end of the typical range, as the scale of structural work is greater than on a two-storey property. Planning permission is almost always required.

Alternative Types of Loft Conversions

Though roof lift loft conversions are an excellent investment and are a great solution for additional space, there are alternative options.

Dormer Loft Conversion

Dormer loft conversions can also create additional headroom and floor space. The process for this type of attic conversion involves extending the roof, much like a roof lift loft conversion.

As a cheaper alternative, ranging between £30,000 and £60,000, dormer conversions are suitable for a range of homes. However, they often are restricted, since the original roof design can’t be altered in the same way as a lift loft conversion.

Hip-To-Gable Loft Conversion

Another option would be a hip-to-gable conversion, which takes its name from extending the hip of the roof to create a gable.

This can add significant space to any attic and will typically cost between £40,000 and £60,000, which is more affordable than a roof lift conversion for many. A hip-to-gable conversion is only possible for properties with a hip roof.

Velux Rooflight Loft Conversion

Finally, there’s the option of a classic Velux rooflight conversion. Rooflights are a good way to bring more natural light into an attic space. They require no alteration of the existing roof structure, so you generally won’t need planning permission.

A typical rooflight installation costs between £10,000 and £20,000, but no extra headroom or floor space will be added.

Hiring Contractors Checklist for Roof Lift Loft Conversions

Finding the right specialist contractor for a roof lift conversion can feel like a major task in itself. Use our checklist below to choose an experienced contractor who will carry out the job to the high standard you expect.

• Confirm Experience with Structural Roof Work - Undoubtedly, the most important step for finding a structural roof contractor is to verify their experience. You should ask important questions and ask to see any photographs of previous projects. It’s always a good idea to look at previous client reviews, too. Any reputable contractor will have a strong portfolio of work and positive feedback.
• Verify Qualifications and Insurance - Next, you should ensure that the contractor has the essential qualifications required for a loft conversion. Check for recognised certifications and ensure that the contractor has a trade body membership. You should also ask what the contractor’s insurance policy covers; as a minimum, insurance should include public liability.
• Request References and Examples of Previous Roof Lifts - A good contractor will be able to provide references from their previous clients and show examples of their work. Photos of completed roof lift loft conversions will help you to ensure that they’re capable of delivering high-standard work.
• Get a Detailed Quote Covering All Stages - To avoid the surprise of additional costs being added to the project, an important first step is to get clear on costs for all stages. Ask for a full breakdown of the scope of work, including labour, waste disposal, and so on.
• Clarify Timelines and Payment Terms - To avoid delays, set a clear starting date for your job and end date. This will help to establish a timeline and keep the project on track from the beginning. Discuss any deposits, payment terms, and invoicing.
• Ensure Planning and Building Control Compliance is Included - An experienced roofing contractor will understand the intricacies of building control requirements and planning regulations. They will be largely responsible for the planning application process, so you should confirm this early on with them.

Removing Existing Roof Structures

Removing an existing roof structure is no straightforward task. Roof removal must be carried out carefully and requires highly skilled labour to do so correctly. There are numerous steps involved in removing an existing roof, and scaffolding must be erected to ensure safety for the workers.

Rafters, supporting timbers, and tiles must all be removed from the roof, and then a waterproof covering is used to protect the interior. Removal of an existing roof will affect the duration of the project as a whole and will incur additional costs.

From increased labour efforts to more waste disposal, removing an existing roof can easily increase the overall cost of a loft conversion by up to £10,000. Oftentimes, homeowners have to seek out temporary accommodation if a full roof removal is underway.