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Basement / Cellar Conversions in Alton (66)

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  • Sponsored
    Elite Building Services Logo

    Elite Building Services

    9.70

    (37 reviews)

    Operates in Alton

    Services & skills
    Builder
    Basement / Cellar Conversions
    Period Property Restoration
    New Builds
    Project Management
    Call
  • B & N Builders Logo

    B & N Builders

    10.00

    (28 reviews)

    Operates in Alton

    Services & skills
    Builder
    Basement / Cellar Conversions
    Concrete Garages
    Car Ports
    Insurance Claim Specialist
    Call
  • Anaid construction Ltd Logo

    Anaid construction Ltd

    9.92

    (16 reviews)

    Operates in Alton

    Services & skills
    Builder
    Basement / Cellar Conversions
    Wall Tie Replacements
    Garden Studios
    Sustainable Construction
    Call
  • premier building Logo

    premier building

    10.00

    (1 review)

    Operates in Alton

    Services & skills
    Builder
    Basement / Cellar Conversions
    Refurbishments
    Extensions / Conversions
    Garage Conversions
    Call
  • Trevor C Marchant Plastering Services

    9.97

    (111 reviews)

    Operates in Alton

    Services & skills
    Builder
    Basement / Cellar Conversions
    Concreting
    General Building
    Refurbishments
    Call
  • MORCO CONSTRUCTION LTD Logo

    MORCO CONSTRUCTION LTD

    9.97

    (12 reviews)

    Operates in Alton

    Services & skills
    Builder
    Basement / Cellar Conversions
    Demolition
    Car Ports
    Cladding
    Call
  • MK General Building Ltd Logo

    MK General Building Ltd

    9.96

    (31 reviews)

    Operates in Alton

    Services & skills
    Builder
    Basement / Cellar Conversions
    Concreting
    Suspended Ceilings
    Loft Conversions
    Call
  • T&H Construction Services Ltd Logo

    T&H Construction Services Ltd

    9.56

    (3 reviews)

    Operates in Alton

    Services & skills
    Builder
    Basement / Cellar Conversions
    Fire and Flood Renovation
    Period Property Restoration
    New Builds
    Call
  • GS Building Plastics Limited Logo

    GS Building Plastics Limited

    10.00

    (189 reviews)

    Operates in Alton

    Services & skills
    Builder
    Basement / Cellar Conversions
    Demolition
    Wall Tie Replacements
    Loft Conversions
    Call
  • DC Carpentry And Renovations Logo

    DC Carpentry And Renovations

    10.00

    (2 reviews)

    Operates in Alton

    Services & skills
    Builder
    Basement / Cellar Conversions
    Partition Walls
    Car Ports
    New Builds
    Call
  • CJP Logo

    CJP

    9.89

    (40 reviews)

    Operates in Alton

    Services & skills
    Builder
    Basement / Cellar Conversions
    Cladding
    General Building
    Green Oak Framing
    Call
  • ELV CONSTRUCTION & MAINTENANCE LTD Logo

    ELV CONSTRUCTION & MAINTENANCE LTD

    10.00

    (4 reviews)

    Operates in Alton

    Services & skills
    Builder
    Basement / Cellar Conversions
    Concrete Garages
    Wall Tie Replacements
    Car Ports
    Call

Find Companies for Basement and Cellar Conversions in Alton

Dreaming of converting your cellar or basement into a home office, cinema room, or guest bedroom, but unsure about who to hire and how much it will cost?

Checkatrade can help.

Keep reading for everything you need to know about basement and cellar conversions in Alton and how to hire a checked and reviewed tradesperson for the job.

Want to jump straight into it? Try our quick request a quote feature and we’ll put you in touch with experienced basement conversion companies covering your local area.

Average cellar conversion costs in Alton

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Looking for basement excavation prices? Our cost guide to building a basement has all the details.

Top tip: You can also try out our job estimate calculator to get a steer idea on costs for your project.

Do I need planning permission to convert a cellar?

Most cellar conversions don’t need planning permission if you’re converting an existing space.

However, if you’re excavating deeper, changing the external appearance, or creating a new entrance, you’ll likely need permission and Building Regulations approval.

Contact your local authorities as a first port of call.

Is a cellar conversion worth it?

Yes – converting a cellar can add valuable living space and increase the property value. It’s also a great option for homeowners in areas where extending upward or outward isn’t possible.

Basements and cellars are legal in the UK, but the work must comply with UK Building Regulations.

This ensures the conversion meets industry-standard requirements for damp proofing, ventilation, fire safety, and structural safety.

Can you convert a cellar into a bedroom?

Yes - with the right planning and building work, you can convert a cellar into a bedroom, guest suite, or even a self-contained studio.

To meet building regulations, your cellar bedroom will need:

  • Proper ventilation and insulation
  • A safe fire escape route
  • Adequate ceiling height and natural light
  • In some cases, planning permission

These checks aren’t just for comfort - they’re essential if you ever decide to sell your home. A compliant conversion can add value and avoid issues during surveys or legal checks.

Why use Checkatrade?

  • Fully checked contractors covering your local area
  • Insurance always listed
  • Easy to compare multiple profiles
  • Handy reviews from local customers
  • Covered by the Checkatrade Guarantee (T&Cs apply)

Looking for more tradespeople in Alton?

Find Checkatrade reviewed Tradespeople, get a quote today, discover related services in Alton and check out our latest home improvement guides.