Question 1

Do I need planning permission for a basement conversion in Leeds?

Accepted Answer

In most cases, no. Converting an existing basement or cellar into a habitable living space falls under Permitted Development rights, which means you do not need to apply for planning permission from Leeds City Council. However, you may need planning permission if your property is in a conservation area, your home is a listed building, you are excavating to create a new basement where none existed before, or you plan to add a new external entrance, window, or lightwells visible from the street. We advise all clients on whether planning permission is required during their free initial consultation.

Question 2

Do I need building regulations approval for a basement conversion in Leeds?

Accepted Answer

Yes — unlike planning permission, building regulations approval is always required for a basement conversion, regardless of whether it is an existing cellar or a new dig-out. Building regulations cover structural integrity, fire safety, damp proofing and waterproofing, ventilation, electrical installations, and means of escape. Back To Basement Ltd handles the building regulations application on your behalf as part of every project. The approximate fee payable to Leeds City Council is around £1,300, paid directly by you to the council.

Question 3

Do I need a party wall agreement for a basement conversion in Leeds?

Accepted Answer

If your property is semi-detached or terraced, or if your basement walls are shared with a neighbouring property, you will likely need a Party Wall Agreement under the Party Wall etc. Act 1996. This is a legal notice to your neighbour informing them of the intended works. Failure to serve the correct notices can cause costly delays to your project. We flag this during your initial consultation if it applies to your property and can refer you to a structural engineer who provides this service.

Question 4

How much does a basement conversion cost in Leeds?

Accepted Answer

Basement conversion costs in Leeds typically range from £20,000 to £60,000+, depending on the size of the basement, its current condition, the level of finish required, whether underpinning is needed, and the extent of waterproofing required. As a rough guide, a straightforward cellar conversion on a 30-40m2 Leeds property might start from around £30,000-£40,000 inc VAT, while a larger, more complex project can reach £80,000-£100,000+. We provide fully itemised, transparent quotes with no hidden costs. Contact us for a free site visit and detailed quotation.

Question 5

Are there any hidden costs I should be aware of with a basement conversion?

Accepted Answer

At Back To Basement Ltd we pride ourselves on transparent, fully itemised quotes with no hidden costs. However, there are some additional items not always included in a standard quote: building regulations fees (approximately £1,300, paid directly to Leeds City Council), structural engineer fees if required, party wall surveyor fees if applicable, flooring materials (we quote labour only), and decoration. We make all of these clear upfront so there are no surprises during your project.

Question 6

How do I pay for my basement conversion?

Accepted Answer

We operate a straightforward payment schedule. A non-refundable £300 booking deposit is required to secure your project slot. Once works begin, an initial deposit is taken, followed by weekly interim payments throughout the build, with a final balance due on completion. We do not ask for large upfront payments. Our payment structure is designed to give you confidence that you are only paying for work that has been completed.

Question 7

Will a basement conversion add value to my Leeds home?

Accepted Answer

Yes — a well-executed basement conversion is one of the best investments you can make in a Leeds property. Adding usable square footage is one of the primary drivers of property value. In many parts of Leeds where space is at a premium — areas like Headingley, Chapel Allerton, Roundhay, and Alwoodley — a finished basement can add significantly more value than the cost of the conversion itself. Estate agents consistently report that a converted basement can add 10-15% to a property's value.

Question 8

Is my Leeds property suitable for a basement conversion?

Accepted Answer

Most properties in Leeds with an existing basement or cellar are suitable for conversion. Leeds has a large number of Victorian and Edwardian terraced and semi-detached properties — particularly in areas like Hyde Park, Headingley, Burley, Kirkstall, and Chapel Allerton — and these are often excellent candidates. Key factors we assess include current headroom, existing damp levels, foundation depth, access for materials and waste, and the structural condition of existing walls and ceiling. The best way to find out is to book a free site visit — we will give you an honest assessment with no obligation.

Question 9

Can I dig out my basement to get more headroom?

Accepted Answer

Yes, in many cases we can excavate the existing floor to increase headroom — typically up to 300mm below the existing floor level as standard. Where more headroom is needed, additional excavation and underpinning works may be required. Underpinning involves deepening the foundations of your property to allow for the additional dig-out. Back To Basement Ltd has extensive experience in underpinning Leeds properties and carries out this work to a very high standard.

Question 10

Do I need to move out during a basement conversion in Leeds?

Accepted Answer

In most cases, no — you can continue to live in your property during the conversion. This is one of the key advantages of a basement conversion over other types of extension. There will be some disruption, particularly during the initial excavation and structural phases — dust, noise, and the movement of materials and skips are all part of the process. Our team works efficiently to minimise disruption and always keeps the property as clean and tidy as possible throughout the project.

Question 11

How do you waterproof a basement conversion in Leeds?

Accepted Answer

We use a cavity drain membrane system (Type C waterproofing under BS 8102) as our primary method. This involves installing a studded membrane (Triton Platon) to the walls and floor, which creates a drainage cavity that channels any water ingress to a perimeter drain and sump pump system. The sump pump then automatically removes the collected water. All of our waterproofing work is carried out to British Standard BS 8102 and we are Triton Users Guarantee Company approved contractors.

Question 12

My cellar is currently damp — can it still be converted?

Accepted Answer

Absolutely. Most cellars we work on in Leeds have some level of damp before we start — that is completely normal and is exactly what our waterproofing system is designed to address. A damp cellar is not a barrier to a successful conversion. Whether your cellar has minor condensation, water ingress through the walls, or more serious flooding issues, we will assess the source and extent of the problem during our site visit and design a waterproofing solution accordingly.

Question 13

How long does a basement conversion take in Leeds?

Accepted Answer

A typical basement conversion in Leeds takes between 8 and 14 weeks from start to completion, depending on the size and complexity of the project. A straightforward cellar conversion might be completed in 6-8 weeks, while a larger project involving significant excavation, underpinning, and a high-spec fit-out could take 14-20 weeks. We give every client a clear, realistic timeline before work begins and keep you updated throughout.

Question 14

What is included in a Back To Basement conversion?

Accepted Answer

We provide a fully managed, end-to-end service including: stripping out, demolition and excavation; structural works including underpinning and steel beams where required; concrete floor slab; full cavity drain membrane waterproofing system and sump pump; insulation to walls, floors and ceilings; first fix joinery; first and second fix plumbing and electrical; drylining and plastering; second fix joinery including skirting boards, architrave and doors; and building regulations application and management. Flooring, tiling and decoration are priced separately based on your choice of materials.

Question 15

Who carries out the work — do you use subcontractors?

Accepted Answer

Back To Basement Ltd has its own directly employed team of experienced tradespeople who carry out the majority of the works. We use trusted, long-standing partner companies for specific elements such as electrical installation and plumbing, all of whom are fully qualified. Rubi Kasuto, our Managing Director, is involved in every project and carries out regular site visits throughout the build. You will always have a direct point of contact throughout your project.

Question 16

What areas of Leeds do you cover for basement conversions?

Accepted Answer

We carry out basement conversions across all areas of Leeds, including Headingley, Chapel Allerton, Roundhay, Alwoodley, Horsforth, Moortown, Meanwood, Oakwood, Weetwood, Adel, Bramhope, Rawdon, Calverley, Farsley, Pudsey, Morley, and all surrounding areas. Call us on 07930 360 880 if you are unsure whether we cover your area.

Question 17

How long has Back To Basement Ltd been operating in Leeds?

Accepted Answer

Back To Basement Ltd was founded in 1997 by Rubi Kasuto, who had previously been running a conversion and renovation business in Leeds for fifteen years before specialising in basement conversions. That means we bring over 27 years of specialist experience to every project — more than almost any other company in the Leeds area. Over that time we have completed more than 100 basement and cellar conversion projects across Leeds and West Yorkshire.

How Much Does a Basement Conversion Cost in Leeds in 2026?