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Basement Conversions in Walton On Thames (283)

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  • Sponsored
    PMS Builders Ltd Logo

    PMS Builders Ltd

    8.00

    (9 reviews)

    Operates in Walton

    Services & skills
    Builder
    Extensions / Conversions
    Garage Conversions
    Garden Studios
    New Builds
    Call
  • Sponsored
    R.e. Building & Consultancy Ltd Logo

    R.e. Building & Consultancy Ltd

    9.92

    (21 reviews)

    Operates in Walton

    Services & skills
    Builder
    Extensions / Conversions
    Agricultural Building
    Basement / Cellar Conversions
    Suspended Ceilings
    Call
  • Snow White Professionals Logo

    Snow White Professionals

    9.63

    (227 reviews)

    Operates in Walton

    Services & skills
    Builder
    Extensions / Conversions
    Emergency Builder Service
    Sustainable Construction
    Refurbishments
    Call
  • Lion and Leinster Property and Building Services Logo

    Lion and Leinster Property and Building Services

    10.00

    (33 reviews)

    Operates in Walton

    Services & skills
    Builder
    Extensions / Conversions
    Refurbishments
    Loft Conversions
    Garden Studios
    Call
  • Matstone Projects Limited Logo

    Matstone Projects Limited

    8.40

    (14 reviews)

    Operates in Walton

    Services & skills
    Builder
    Extensions / Conversions
    Call
  • Buildstar Ltd Logo

    Buildstar Ltd

    10.00

    (47 reviews)

    Operates in Walton

    Services & skills
    Builder
    Extensions / Conversions
    Basement / Cellar Conversions
    Demolition
    Loft Conversions
    Call
  • Kozi Construction Ltd Logo

    Kozi Construction Ltd

    10.00

    (64 reviews)

    Operates in Walton

    Services & skills
    Builder
    Extensions / Conversions
    Equestrian Stable
    Wall Tie Replacements
    Stretched Ceilings
    Call
  • Nexgen Builders Limited Logo

    Nexgen Builders Limited

    9.41

    (15 reviews)

    Operates in Walton

    Services & skills
    Builder
    Extensions / Conversions
    New Builds
    Project Management
    Loft Conversions
    Call
  • Build Mode Limited Logo

    Build Mode Limited

    10.00

    (34 reviews)

    Operates in Walton

    Services & skills
    Builder
    Extensions / Conversions
    Period Property Restoration
    Project Management
    General Building
    Call
  • Able 2 Build & Sons Ltd Logo

    Able 2 Build & Sons Ltd

    9.83

    (70 reviews)

    Operates in Walton

    Services & skills
    Builder
    Extensions / Conversions
    Diamond Drilling
    Wall Tie Replacements
    Brick / Concrete Structural Repairs
    Call
  • Build Master Construction Ltd Logo

    Build Master Construction Ltd

    9.40

    (58 reviews)

    Operates in Walton

    Services & skills
    Builder
    Extensions / Conversions
    Refurbishments
    New Builds
    General Building
    Call
  • ABC.London.Construction Ltd Logo

    ABC.London.Construction Ltd

    10.00

    (40 reviews)

    Operates in Walton

    Services & skills
    Builder
    Extensions / Conversions
    Suspended Ceilings
    Period Property Restoration
    Refurbishments
    Call

Conversion and extension builders in Walton

Planning a loft conversion, garage makeover or full house extension in Walton? You’re in the right place. Whether you’re adding space for a growing family, upgrading your layout or increasing your home’s value, we can help you find the right tradesperson for the job.

Find extension and conversion builders in Walton

Every builder on Checkatrade passes up to 12 checks before they appear in your search. You can read verified reviews, compare services, and even post your job to get quotes straight to your inbox, all in a few clicks. That’s how we help homeowners like you get a job done right.

What to expect from hiring an extension or conversion builder in Walton

Our checked tradespeople in Walton cover a wide range of projects, including:

  • Single or double-storey house extensions

  • Kitchen and diner extensions

  • Loft, attic, garage or basement conversions

  • Garden room extensions

  • Utility room extensions

  • Over-garage extensions and side returns

Extension and conversion build costs in Walton

Costs of extensions and conversions vary depending on size, structure and spec, but here's a rough guide:

Extensions:

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Loft conversions:

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Garage conversions:

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Conservatory roof conversions:

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Need help calculating costs? Use our Job Value Estimator Tool for a bespoke cost estimate.

What to check before you hire:

  • Are drawings or planning permissions needed?
  • Are they familiar with building regs?
  • Is the quote fixed or flexible?
  • Does it cover materials and project management?

Most builders will include prep, construction, electrics, plumbing and final finishes in their quote, but always double-check. Timelines range from a few weeks for simple jobs to several months for bigger builds.

Extension and conversion builders in Walton: Homeowners vs renters

Homeowners:

You’re in charge of the project. That means hiring the builder, securing permissions, and paying for the work. You may need:

  • Planning permission (especially for double-storey builds or changes near boundaries)

  • Drawings from an architect or structural engineer

  • Building regs approval

If you’re not sure where to start, speak to a local builder or post your job to get help with the process.

Renters:

You’ll usually need your landlord’s approval to make any big changes. In most cases, your landlord will be the one arranging and paying for structural changes like loft conversions or extensions. That said, it’s worth flagging ideas if you think they’ll improve the property, especially if it means longer tenancies or fewer repairs.

Emergency extension or conversion help in Walton

Extensions and conversions are big projects, but sometimes, things go wrong and need sorting fast. Common urgent issues include:

  • Leaks in newly converted lofts

  • Structural cracks or shifting

  • Faulty electrics or plumbing in newly added rooms

  • Incomplete work by previous builders

Facing an emergency in Walton? Enter your postcode or post a job to find emergency services in your area.

Find the right extension or conversion specialist in Walton

Looking for a builder to help with:

  • Rear house extensions
  • Kitchen extensions
  • Garage conversions
  • Loft or attic conversions
  • Garden room builds
  • Basement or cellar conversions
  • Conservatory roof upgrades
  • Utility or porch extensions

Start your search now


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