Typical budget
£45,000 to £130,000+
Depends on conversion type, borough, access, and finish level.
Create the extra room your life now needs. Without leaving the home you already love.
A well-planned loft conversion can give you the bedroom, office or guest suite you are missing while protecting the feel and long-term value of your home. We help London homeowners move from idea to finished space with clear guidance, practical planning and disciplined delivery.
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Quick Answer
Loft conversions in London are usually worth serious attention
If your house has the height and the right roof shape, a loft conversion is often the cleanest way to add an extra bedroom, office or en-suite without losing garden space or moving house.
Direct answer: most London loft conversions cost between £45,000 and £130,000+, many houses can convert under permitted development, and the full process usually takes 4 to 6 months once design, approvals and build are all counted properly.
Planning route
Often permitted development
Flats, maisonettes, conservation areas and mansards usually need more planning work.
Build phase
8 to 16 weeks on site
Total journey is usually 4 to 6 months once design and approvals are included.
Value upside
Often 15% to 25%
A well-designed loft can add a bedroom, improve layout, and strengthen resale value.
Why Loft
Why loft conversions work so well in London
The best reason to convert a loft is rarely just square footage. It is what that space lets the rest of your home become.
Stay in the area you chose on purpose
A loft conversion often gives you the extra bedroom, office or guest suite you need without walking away from your street, your school catchment, or your routines.
Gain space without sacrificing the garden
For many London homes, the space above your head is the least disruptive way to add meaningful square footage and keep ground-floor life intact.
Create a room that changes the whole house
A strong loft conversion does more than add one room. It can free up bedrooms below, improve privacy, and make the entire layout feel calmer.
Costs
Loft conversion costs by type in London
Use these numbers to sense-check affordability early and to narrow down which conversion route is realistic for your house before you start detailed design.
| Type | Typical budget | Build phase | Planning route |
|---|---|---|---|
| Rooflight / Velux | £25,000 to £45,000 | 4 to 6 weeks build | Usually permitted development |
| Rear dormer | £45,000 to £75,000 | 8 to 12 weeks build | Often permitted development |
| Hip-to-gable | £55,000 to £80,000 | 9 to 13 weeks build | Usually permitted development on suitable houses |
| L-shaped dormer | £60,000 to £90,000 | 10 to 14 weeks build | Often planning-light, but property dependent |
| Mansard | £70,000 to £100,000+ | 12 to 16 weeks build | Usually full planning |
Professional fees and structural input often add 10% to 15% on top of the build cost.
Party wall matters can add £1,000 to £3,000 per neighbour where required.
Inner London boroughs often carry a 15% to 25% cost premium versus outer areas.
Types
Which loft conversion route fits your house?
The right answer depends on your roof shape, the amount of headroom you already have, your planning context, and how much usable floor area you actually need.
£25,000 to £45,0004 to 6 weeks build
Rooflight / Velux
Best when your loft already has enough usable height and you want the simplest route to an extra room.
Planning note: Usually permitted development
£45,000 to £75,0008 to 12 weeks build
Rear dormer
The most common London option when you need proper headroom, a practical stair, and a room that feels fully usable.
Planning note: Often permitted development
£55,000 to £80,0009 to 13 weeks build
Hip-to-gable
Strong fit for semi-detached and end-of-terrace homes where the sloping side roof is limiting the space you can actually use.
Planning note: Usually permitted development on suitable houses
£60,000 to £90,00010 to 14 weeks build
L-shaped dormer
A high-value route when you want to maximise floor area and create space for a larger bedroom plus bathroom or storage.
Planning note: Often planning-light, but property dependent
£70,000 to £100,000+12 to 16 weeks build
Mansard
The premium option when you want the biggest transformation and are prepared for a more planning-led process.
Planning note: Usually full planning
Proof
What real loft reviews tend to talk about
The strongest reviews are usually specific. They mention timing, calm communication, first-time nerves, or whether the finished loft actually made life easier.
9-week delivery promise keptHouzz Review
North East London hip-to-gable loft conversion
What makes this review strong is that it answers the questions most homeowners ask before they commit: whether the company can be trusted, whether the promised timeline is real, and whether the extra space is delivered without drama.
“After comparing loft conversion companies in North East London, we chose Better Homes. The team delivered our hip-to-gable loft in 9 weeks exactly as promised.”
- Project type: hip-to-gable loft conversion
- Outcome: extra room created without moving
- Most important proof point: delivered in 9 weeks as promised
George G
Houzz Review
“I came across Better Homes through Houzz as I needed to fully renovate my first flat and I could honestly not recommend them enough.”
Perrine LeGoanvic
Houzz Review
“This was our first renovation project in our first home, so we were quite nervous about the process, but Gino and his team made it really smooth.”
Lawrance and Kate
Houzz Review
“The whole process was streamlined and efficient, with a detailed quote and a very high standard of work.”
Louise Thorogood
Houzz Review
Process
How we keep loft projects under control
The aim is not to drown you in process. It is to remove the points where loft conversions usually drift: feasibility, approvals, sequencing, and communication.
Step 1
Feasibility first
Before anyone gets excited about layouts, we check head height, stair position, roof shape, planning context, and whether the loft is genuinely worth pursuing.
Step 2
Budget and route selection
We help you compare the realistic paths available to your house so you do not over-spec the project or chase the wrong conversion type.
Step 3
Design, approvals and pre-construction clarity
The drawings, structural decisions, approvals and sequencing need to line up before site starts. That is what keeps the build calmer later.
Step 4
Build with weekly updates
Once work starts, you should never wonder what is happening. We keep progress visible, decisions moving and disruption as controlled as possible.
Step 5
Snagging and handover
A loft conversion should finish with detail, not fatigue. We close out the job with checks, snagging discipline and a handover you feel good about living with.
Guarantees that protect the work after handover
When you invest heavily in your home, you should know what happens after the builders leave. Our workmanship guarantees are there to give you clear protection and peace of mind.
10 years
Extension and loft conversion guarantee
2 years
Bathroom fitting and renovation guarantee
2 years
Kitchen fitting and renovation guarantee
1 year
Painting and decorating guarantee
Want the full guarantee breakdown?
Read it hereFAQ
Frequently Asked Questions
- Most London loft conversions sit between roughly £45,000 and £130,000+, depending on the type. Rooflight conversions are the cheapest, rear dormers are the most common, and mansards sit at the premium end because they usually involve more planning and structural change.
- Often not on standard houses, because many loft conversions can proceed under permitted development. But flats, maisonettes, listed homes, conservation-area properties, and mansard proposals usually need more planning work. We assess that early so you do not build assumptions on the wrong route.
- The build phase is often around 8 to 16 weeks depending on the type, but the full journey including design, approvals, party wall matters and contractor scheduling is usually closer to 4 to 6 months.
- As a rule of thumb, you want around 2.2 metres from the top of the existing ceiling joists to the underside of the ridge. Borderline lofts may still work, but only after a proper feasibility check.
- Yes. Many loft projects work best when the room, storage and bathroom are planned together rather than treated as separate add-ons later.
Useful Reading
The loft guides worth reading before you commit
If you are still comparing routes, these are the pages that answer the questions most London homeowners ask before they spend serious money.
Loft conversions in London: the complete 2026 guide
The big-picture guide covering types, costs, timelines, ROI and common planning constraints for London homeowners.
Planning permission for loft conversions in London
Use this if you need clarity on permitted development, conservation areas, Article 4 and when full planning becomes necessary.
How to finance an extension or loft conversion in London
Useful if you are comparing remortgaging, further advances, savings and the real cost of moving instead of improving.
Loft conversion vs house extension in London
Read this if you are still deciding which route gives you better value, less disruption, or more suitable space.
Next Step
If loft conversion is on your shortlist, start with clarity
A good first conversation should tell you whether your loft is viable, which route fits your house, and where the major cost and planning variables sit. That alone can save weeks of wasted time.