Understanding the Cost of Your Basement Conversion

 

There are many factors that contribute to the cost of converting your basement into a functional and inviting space. From the size of your basement to the materials used, each element plays a role in determining the final price. To help you get a clearer idea of what your project might cost, we’ve created a simple and easy-to-use calculator.

Below, you’ll find a cost estimation tool that takes into account the most common variables involved in basement conversions. By inputting a few key details about your project, you’ll receive an estimated cost tailored to your needs.

 

Please Note: While this calculator provides a useful starting point, it’s important to remember that every project is unique. For a more detailed and personalized quote, we recommend consulting with one of our experts.

Ready to get started? Simply your project information below to begin your cost estimation!

 

 

 

 

What’s Included in the Cost Calculation?

 

Our online calculator provides an estimate based on the following items, which are typically included in a basement conversion project:

  1. Excavation and Lowering of Existing Floors

    • Excavation and lowering of your existing floors (including concrete and stone) to a depth of no more than 300mm (1ft).

  2. New Concrete Floor

    • Installation of a new concrete floor, including integrated perimeter drainage channels and a sump pit.

    • A new single 240Lt minimum pump connected to external drains.

  3. Waterproofing and Moisture management (Tanking)

    • All walls and floors, including stone steps, will be treated using Cavity Drain Membrane (tanking) to ensure a dry and secure space.

  4. Insulation

    • Insulation to floors, external walls, and ceilings to improve energy efficiency and comfort.

  5. Walls and Partitions

    • Construction of secondary timber walls, fast-track metal and timber stud walls, and door frames.

  6. Finished Flooring

    • Installation of a new 18mm chipboard flooring as your finished floor, ready for the final flooring of your choice.

  7. Electrical Installation

    • Comprehensive electrical installation, including:

      • New sockets, switches, downlights, isolators, and smoke detectors.

      • A separate small consumer unit to house all new electrical installations.

      • An electrical safety certificate will be provided by our qualified electrician 

  8. Plumbing Installation

     

    • Relocation of pipework and installation of new radiators.

    • Supply of hot and cold feeds, connected to your existing boiler.

 

 

 

What’s Not Included in the Cost Calculation?

 

 

The following items are not included in the estimate provided by our online calculator and will require additional costs:

  1. Building Regulation Application Costs

    • These costs depend on the size and complexity of your project.

  2. External Excavation and Structural Work

    • Any external excavation to create new light wells or external stairs.

    • New openings to outside areas or enlargement of existing door/window openings.

    • Internal structural work, such as removing walls, installing structural steel (RSJ), underpinning, or reinforcement of walls or foundations.

  3. New External Doors

    • Supply and installation of new external doors.

  4. Upgraded Internal Doors 

    • The type of internal doors will be specified in your quotation. You’ll have the option to upgrade to more expensive doors, handles, etc., at an additional agreed cost.

  5. New Banister

    • Installation of a new banister.

  6. New Boiler

    • Our estimate assumes your existing boiler is in good working order and capable of handling additional radiators. If a new boiler is required, we can provide a separate cost for supply and installation.

  7. Finished Flooring

    • Any finished flooring, including laminate, vinyl, hardwood, or tiles.

    • You’ll be given the option to choose between supply & fit, fit only, or other arrangements. (Note: We do not install carpets.)

  8. Shower Room Fittings

    • Installation of shower room fittings, such as showers, hand basins, WC pans and cisterns, and waste pumps (macerators).

  9. Kitchen Fittings or Fitting Service

    • We can provide a competitive price for kitchen fittings or fitting services upon request.

  10. Tiling

    • Tiling for walls and floors, including tiles, adhesives, grouts, and tile trims.

  11. Painting and Decorating

     

    • Painting and decorating services are not included in the estimate.

 


Contact Us for More Information

If you have any questions or would like to discuss additional services, please don’t hesitate to contact us:
Email: info@backtobasement.co.uk

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"Back To Basement Ltd. – Expert in Basement Conversions & Waterproofing. Fully insured with Contractors' All Risks & Public Liability Insurance. Serving Leeds, Harrogate, Guiseley & surrounding areas. Quality workmanship & free site visit available!" Copyright: "© 2025 Back To Basement Ltd. All rights reserved. Basement Conversions & Waterproofing in Leeds,"

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