Builders
Carpenters
Electricians
Flooring Specialists
Gardeners
Handymen
Heating Engineers
Painters & Decorators
Plasterers & Renderers
Plumbers
Roofers
Tilers
myHip to Gable Loft Conversion Cost
At a Glance
- The average hip to gable loft conversion costs around £45,000 in 2026.
- It typically takes around 6 to 8 weeks to complete this type of loft conversion.
- NEW! Our hip to gable loft conversion cost calculator.
- A complete pricing breakdown which includes types to consider, along with what such a task usually involves.
- How long the job should approximately take and a general overview of what kind of jobs can be performed.
- How to find and hire a loft conversion specialist.
Get free estimates
Are you a trade? Get more work today!
Want to discover all the details of hip to gable loft conversion costs?
The average cost for a standard hip to gable loft conversion in the UK is £45,000, although for detached properties or projects with higher specifications can reach £55,000 to £75,000 (or over, depending on size and complexities involved).
Ready to get a quote?
MyJobQuote has a Trustpilot score of 4.8 (41,000+ reviews) and is used by more than 1 million homeowners across the UK every year.
Tell us what you need and we'll connect you with loft conversion specialists near you. They'll provide you with free and no obligation quotes for this type of job.
Need more time and information?
This guide will help you calculate how much a hip to gable conversion will cost you, although end prices may vary depending on size, design and materials.
£45,000
Table of Contents
- How Much Does a Hip To Gable Loft Conversion Cost?
- Supply Costs of Hip to Gable Loft Conversion
- Additional Hip to Gable Loft Conversion Costs
- Labour Cost of Hip to Gable Loft Conversion & Timescales
- Factors That Impact Hip to Gable Loft Conversion Costs
- What's Involved in a Hip to Gable Loft Conversion?
- Building Regulations & Planning Permission for a Hip to Gable Loft Conversion
- Types of Hip to Gable Loft Conversions
- Hip to Gable Loft Conversion Ideas
- Benefits of a Hip to Gable Loft Conversion
- Checklist: Hiring Loft Conversion Specialists Near You
- FAQs
Hip to Gable Loft Conversion Cost Calculator
How Much Does a Hip To Gable Loft Conversion Cost?
Most UK homeowners pay between £40,000 to £65,000 for a hip to gable attic conversion.
It's a large project that requires a lot of planning and involvement from different types of tradespeople. On average, you should expect a hip to gable loft conversion to take between 6 and 8 weeks to complete, although this may take longer for larger and more complex builds - poor weather conditions can also impact the time required.
What is your main reason for a hip-to-gable loft conversion?
Extra living space
1 votes - 14%14% of votes
Add an additional bedroom/guest room
3 votes - 43%43% of votes
Creating a home office or studio
0 votes - 0%0% of votes
Building a gym, home cinema or games room
1 votes - 14%14% of votes
Increase property value
2 votes - 29%29% of votes
7 votes
See results
Hide results
A hip to gable loft conversion extends a hipped roof by replacing the sloping side with a vertical gable wall, creating more full-height loft space. It's a popular choice of loft conversion for detached and semi-detached properties. These structural changes are one reason why costs can be high.
Does 7 weeks sound about right for the timescale to do a hip to gable loft conversion?
"Yes, between 6 to 8 weeks is about the timescale — especially with the weather changes in the UK."
Hip To Gable Loft Conversion Prices
Below are the estimated costs for a full hip to gable loft conversion on different types and sizes of properties:
| Size of Conversion | Average Cost | Time frame |
|---|---|---|
| Hip to gable loft conversion on average-sized semi-detached property | £35,000 – £50,000 | 5 – 6 weeks |
| Hip to gable loft conversion on large-sized semi-detached property | £50,000 – £65,000 | 6 – 8 weeks |
| Hip to gable loft conversion on average-sized detached property | £40,000 – £55,000 | 6 – 8 weeks |
| Hip to gable loft conversion on large-sized detached property | £60,000 – £75,000 | 7 – 9 weeks |
Want a custom price?
Post your job
Hip to Gable Loft Conversion Cost for a Semi-Detached House
A hip to gable loft conversion is especially common on semi-detached houses because many UK semis have a hipped side roof that limits usable loft space. Converting that sloping side into a vertical gable wall creates significantly more headroom and makes the loft much easier to use as a full room.
For an average semi-detached property, costs usually range from £35,000 to £50,000, while larger semi-detached homes or higher-spec projects can reach £50,000 to £65,000. The final price depends on roof size, staircase layout, insulation requirements, window choices and whether an ensuite is included.
Because semi-detached properties usually share a wall with a neighbouring home, you may also need to issue a Party Wall Notice before work begins. This can add extra costs if a formal agreement or surveyor is required.
Hip to Gable Loft Conversion With Rear Dormer Cost
A hip to gable loft conversion with a rear dormer costs more than a standard hip to gable conversion because it combines two major structural changes: extending the sloping side into a vertical gable wall and building a dormer extension from the rear roof slope.
In most cases, you can expect the cost of a hip to gable and dormer conversion to start from around £50,000, with many projects ranging between £55,000 and £75,000 depending on size, specification and whether plumbing is added for an ensuite bathroom. This style might also take longer to build, usually around 7 to 9 weeks.
This type of conversion is popular because it creates much more usable loft space than a standard hip to gable alone, often allowing room for a larger bedroom, extra storage and a bathroom. It also increases full-height headroom across more of the loft, making the finished space feel much more like a normal upper floor.
Hip to Gable Loft Conversion Cost Compared with Other Loft Types
A hip to gable is not the cheapest loft conversion, but it's not the most expensive either.
Loft conversion costs are typically lower for Velux and dormer loft conversions than a hip to gable loft conversion. This is mainly because these other types of loft conversions require fewer structural changes to be made to the roof. However, hip to gable conversions are usually cheaper than roof lift loft conversions, which usually require the biggest structural changes.
To put it in perspective, the cost for a dormer loft conversion is around £1,500 to £2,000 per m², while the cost of a Velux loft conversion is typically between £1,000 to £1,500 per m².
For a mansard loft conversion costs are around £1,750 to £3,000 per m², which is just a bit more than you should expect to be quoted for hip to gable loft conversion costs per square metre.
| Loft Conversion Type | Typical Usable Floor Space | Average Cost Per m² | Typical Total Cost |
|---|---|---|---|
| Velux loft conversion | 15m² – 30m² | £1,000 – £1,500 | £15,000 – £40,000 |
| Dormer loft conversion | 20m² – 35m² | £1,500 – £2,000 | £30,000 – £60,000 |
| Hip to gable loft conversion | 20m² – 35m² | £1,600 – £2,500 | £40,000 – £65,000 |
| Mansard loft conversion | 25m² – 40m² | £1,750 – £3,000 | £55,000 – £80,000 |
| Roof lift loft conversion | 25m² – 40m² | £2,000 – £3,500 | £55,000 – £90,000 |
Want a custom price?
Post your job
How much does it cost to convert a loft space that's approximately 45m² into a bedroom?
"At a minimum, loft conversion costs with roof lights only are £1,500 per square metre (excluding VAT & fees)."
Supply Costs of Hip to Gable Loft Conversion
Below is a list of the separate costs that you may need to pay for your loft conversion:
| Supply | Average Cost |
|---|---|
| Joinery | £3,500 – £4,000 |
| Staircase | £1,800 – £2,200 |
| Windows | £200 – £400 per window |
| Insulation | £5 – £25 per m² |
| Structural beams, joists, and masonry | £1,500 – £4,000 |
| Electrics | £700 – £1,000 |
| Roof structural changes and coverings | £4,200 – £4,800 |
| Plastering | £2,300 – £2,500 |
| Flooring | £5 – £50 per m² |
| Decoration | £1,000 – £1,500 |
| Scaffolding | £2,800 – £3,500 |
Want a custom price?
Post your job
Additional Hip to Gable Loft Conversion Costs
There are a number of additional costs that may come up during a hip to gable loft conversion. Below is a list of those extra costs that may come up:
- Installing light fittings - £80 to £150
- Replace a radiator - £180 to £240
- Replacing roof tiles - £180 to £200
- Architect costs - £500 to £1,200
- Rendering a house - £3,500 to £4,500
- Roof repair - £350 to £500
- Underfloor heating - £1,000 to £1,500
- Wet room cost - £7,500 to £8,500
Labour Cost of Hip to Gable Loft Conversion & Timescales
On average, the total amount you can expect to pay for labour for a hip to gable loft conversion is between £20,000 and £35,000 (although tradesperson rates are higher in London and the South East, which may impact your end cost within these areas).
When it comes to a hip and gable loft conversion, there are several different types of tradespeople that need to be involved in the job. There will usually be around 2 to 3 people working on the project at any one time.
Below is a list of the costs that you can expect to pay for the different elements of labour for a hip to gable loft conversion project and how long each type of tradesperson might be needed on site:
| Tradesperson | Typical Time Needed | Average Cost Per Day | Estimated Labour Cost |
|---|---|---|---|
| Builder | 4 to 8 weeks | £150 – £250 | £3,000 – £10,000+ |
| Carpenter | 1 to 3 weeks | £130 – £200 | £650 – £3,000 |
| Decorator | 2 to 5 days | £120 – £200 | £240 – £1,000 |
| Electrician | 3 to 7 days | £150 – £250 | £450 – £1,750 |
| Plasterer | 3 to 6 days | £150 – £250 | £450 – £1,500 |
| Plumber | 2 to 5 days | £150 – £270 | £300 – £1,350 |
| Tiler | 1 to 3 days | £140 – £250 | £140 – £750 |
Want a custom price?
Post your job
Which takes longer, a hip to gable loft conversion or a dormer loft conversion?
"Hip to gable loft conversion will take longer, as the angles and roof pitch are more complex."
Ask a Trade
Got a question that only a tradesperson can answer? We have thousands of trades ready to answer any question you may have.
Ask your question
Factors That Impact Hip to Gable Loft Conversion Costs
There are several factors that may affect the overall cost of the job. Below is a list of the main things that may affect the overall expense:
Size of Conversion
The size of the conversion can affect the overall cost of the job. A larger loft conversion will cost more, as it will need more materials. It will also take much longer to complete and so will end up costing more in labour.
Window Choices
The more windows you want in your new loft room, the more you can expect to pay. Dormer windows tend to cost more than Velux style windows. Dormer windows will cost around £4,000 to £6,000 each, whereas Velux windows will cost between £800 and £1,100 each.
Plumbing Costs
The more plumbing that needs to be added to the loft, the more you will end up paying in plumbing costs. The cost of plumbing includes material costs and plumbing labour costs. Usually, a plumber will charge around £35 to £45 per hour.
Internal Walls
If you would like to split your new loft area into more than one room, you will have to pay additional costs for internal walls. Adding an internal stud wall with plastering will cost around £700 to £1,000 depending on the size.
Electricity Costs
The more electrical sockets and lights that need to be installed in your new loft area, the more you will end up paying. An electrician will usually charge an hourly rate, so you can easily save on costs by choosing electrical items that are easy to install. The average price per hour for an electrician is around £50 to £120.
What's Involved in a Hip to Gable Loft Conversion?
A hip to gable loft conversion is a very large job that requires a lot of work. If you are able to choose a contractor who is able to provide all of the relevant tradesmen in an organised fashion with no delays, it can be completed in logical stages.
Below outlines a rough guide, although this is under the assumption weather doesn't cause any issues and the exact timeframe can vary depending on the extent of the build required.
- Week 1: Scaffolding and Initial Preparation - The job will begin with erecting scaffolding. All of the materials needed for the job will be gathered on-site, and then the roof will be opened up so that all areas can be accessed.
- Week 2: Structural Alterations - During this week, your roof structure will be altered, and walls will be added. Extra supports will be installed as needed, and if you are having windows installed, these will also be installed during this stage.
- Week 3: Completing External Work - The remaining construction on the roof will be finished off and any tiles that need to be added or replaced will be actioned. Insulation will also be added to the roof. On the internal side, the loft space will now be ready for any electrical or plumbing work that needs to be done.
- Week 4: Internal Loft Space - If there are any windows that haven't yet been fitted, these will be added now. The floor will then be ventilated as needed, and the plasterboard will also be fitted. If there are any internal walls going into the new loft space, these will also be added.
- Week 5: Interior Fittings - This is the point when the stairs will be added. If you are fitting a bathroom up there, this will also go in during this stage. All electrical fittings will also be finished at this time. Towards the end of the week, doors can be hung, skirting added, and the plaster skimmed.
- Week 6: Finishing Touches - During this week, all of the remaining unfinished jobs will be completed. If your contractor is going to be decorating, this will also be completed during this stage. The contractors will then remove all of the scaffolding and dispose of any waste.
Building Regulations & Planning Permission for a Hip to Gable Loft Conversion
In most cases, a hip to gable loft conversion does not require planning permission in the UK because it usually falls under Permitted Development rights. However, permission may still be needed if the project significantly changes the roof shape, extends beyond the existing roofline, or if your property is in a conservation area, listed building, or Area of Outstanding Natural Beauty (AONB).
If planning permission is required, the application fee is usually around £200, with decisions typically taking 8 to 13 weeks. If you are unsure, it's always best to check with your local planning authority or the official Planning Portal before work begins.
If your home shares a wall with a neighbouring property, you may also need to issue a Party Wall Notice. Where a formal agreement is required, surveyor fees usually range from £150 to £200 per hour, with total costs often reaching around £1,000.
All loft conversions must comply with Building Regulations to ensure the work is structurally safe, energy efficient and fire compliant. Inspections are carried out during the build by your local Building Control department or an approved inspector, and a completion certificate is issued once the project meets legal requirements. Building control inspection fees usually range from £350 to £1,250 depending on the size of the conversion.
If I'm converting a loft for use as a home office rather than a bedroom, will I still need to meet certain building regulations?
"You need building regulations if you are doing any structural work. You will also need to meet fire regulations, as there will need to be a way of escaping if there was a fire."
Types of Hip to Gable Loft Conversions
There are two main types of hip to gable loft conversion: a single hip to gable and a double hip to gable.
A single hip to gable loft conversion involves extending one sloping side of the roof into a vertical gable wall. This is most common on end-of-terrace and semi-detached houses, where only one side of the roof is hipped. Costs typically range from £35,000 to £50,000 depending on size and specification.
A double hip to gable loft conversion alters both sloping sides of the roof and is usually found on detached houses with hipped roofs on both sides. Because it involves more structural work, costs are usually higher at around £50,000 to £75,000 or more, but it creates significantly more usable space. A double hip to gable conversion is often combined with a rear dormer to maximise headroom and usable floor area on larger properties.
Hip to Gable Loft Conversion Ideas
When it comes to a hip to gable attic conversion, you can use it for so many different things. Basically, if you can think it, you can probably do it.
The best course of action when it comes to deciding what to do with your new loft room is to take a look at the shape and size of the room and see what would best fit in that space. Below is a list of some of the most common rooms that a loft conversion can be used for:
Master Bedroom with Ensuite
A loft can create an excellent space for a master bedroom. It's perfect as it is an entirely reclusive place away from the rest of the house. Lofts usually have a large amount of space, which can create a large bedroom as well as an en suite.
Additional cost - Around £5,000 to £10,000 on top of the base costs, for plumbing installation and the bathroom suite itself.
If I want to convert my loft into two more beds and a bath how long should this take start to finish?
"We would expect to complete this type of loft in 6/7 weeks. If the loft is a hip to gable type it would take about an extra week."
Child's Bedroom
If your loft space is relatively narrow, it would make a great children's room as a child tends to require a smaller bed and less space. Many children also like the idea of having their own space right at the top of the house.
Additional cost - Around £500 to £2,000 for flooring, lighting, built-in storage and decoration. A child's bedroom usually requires very few additional structural changes, so costs often stay close to the base loft conversion price.
Office
You can make great use of your loft space by turning it into an office tucked away from the rest of the house. Your own space at the top of the house is an excellent option, as you'll be less likely to be disrupted up there. This also allows you to create a separate work and living space in your home.
Additional cost - Approximately £800 to £3,000 over base costs, depending on the number of sockets, lighting points, built-in desks, storage units and flooring finish you choose.
Playroom
If you have children, a loft conversion makes a great space for a playroom. A whole room dedicated to toys and games is a real blessing as your family grows. Your children will also love having their own space that is uniquely theirs.
Additional cost - A playroom usually stays close to the standard conversion cost, with around £500 to £2,500 extra for soft flooring, fitted storage, extra sockets and decorative finishes.
Guest Bedroom
The new loft conversion is a great space for a guest bedroom. It's an easy space to close up if it's not used every day, and it also gives guests their own private space away from the rest of the house when they come to stay.
Additional cost - Using the loft as a guest bedroom typically adds around £500 to £2,500 to total costs, depending on flooring, fitted wardrobes, lighting and heating requirements.
Home Cinema
A loft conversion has cosy dimensions that can make it perfect for a home cinema space. Having a space upstairs dedicated to watching movies can make it an extra special experience.
Additional costs - A home cinema usually adds around £2,000 to £6,000 depending on soundproofing, electrical upgrades, wall finishes, lighting design and audio-visual equipment, so it can be one of the more expensive uses of your new loft.
Benefits of a Hip to Gable Loft Conversion
There are many great benefits to completing a hip to gable attic conversion on your home. Below is a list of some of the main advantages of completing this type of conversion:
Avoid Having to Move Home
If your family is growing and you're outgrowing your current home, then you may be thinking about moving. However, you can create extra space in your current home by converting your loft into a new room. That way, you don't need to worry about the stress of moving.
Add Value to Your Home
The money that you use to complete your loft conversion can be reflected in the overall value of your home when you come to sell it. With this in mind, a loft conversion makes a significant investment.
What type of loft conversion adds the most value to a property?
"Hip to gable dormer which includes additional bedrooms and bathrooms."
Add Natural Light to the Home
When you convert your loft into a room, you can add windows to the room and also above the new staircase. This allows you to add a lot of extra natural light into your living space, which can improve the overall aesthetic of your home.
Increase Indoor Space Without Using Up Outdoor Space
When you choose to extend your home, you may be reluctant to do so if it means compromising on your garden space. If you choose to have your loft converted instead, you can add all of the extra space you need without having to cut into any of the exterior areas of your home.
Energy Efficient
When you convert your loft, you will have to put in new insulation. This is a requirement under the building regulations. adding loft insulation means that you'll most likely make your home more energy-efficient. You may even notice a decrease in your energy bills.
Checklist: Hiring Loft Conversion Specialists Near You
There are a few things you will need to consider before hiring someone to do your hip to gable loft conversion for you. Below is a list of some of the main things that you should consider when looking for the right engineer for the job:
- Does the contractor offer any guarantees with their work?
- How much is the work to complete? – Ask for a breakdown of costs so you can ensure you are paying a fair price for each element of the job.
- Is the contractor experienced in hip to gable loft conversions?
- How many years' worth of experience does the contractor have in hip to gable loft conversions?
- Will the contractor fix any issues that may arise?
- Does the contractor have all the appropriate equipment needed to carry out a hip to gable loft conversion?
- Will the contractor follow building regulations and arrange relevant inspections and visits as needed?
- Will the contractor take care of waste removal?
FAQs
Can I build a hip to gable loft conversion on a bungalow?
Yes, you can do a hip to gable loft conversion on a bungalow.
Will my loft conversion affect my council tax band?
Although a loft conversion won't directly impact your council tax band straight away, it may be recalculated if you move home or put in a direct request with the council. Likewise, if the hip to gable loft conversion makes a significant difference to your property's value this can also impact your council tax.
How much value will a hip to gable loft conversion add to my home?
A hip to gable loft conversion can potentially add an average of around 10-20% to the value of your home, although this isn't a guarantee and can vary depending on the individual property.
Can I get a grant for my loft insulation after the conversion?
There are some grants available for your loft insulation. However, these grants are most likely dependent on your personal situation. It's best to speak to your energy supplier to be certain of whether or not you qualify for any loft insulation grants.
Can I build a hip to gable loft conversion myself?
Since a hip to gable loft conversion requires structural changes to the property, it is best to leave it up to the professionals. If you are having electrics, plumbing, and a staircase fitted, these are also all specialist projects that require an expert. Some of the jobs that you may be able to take on yourself to save some money include clearing the loft space, disposing of waste, decorating, laying flooring, plastering, and adding insulation.
