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Basement Conversions in GU26 (83)

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  • Sponsored
    Ludlam Construction Ltd Logo

    Ludlam Construction Ltd

    9.00

    (90 reviews)

    Operates in GU26

    Services & skills
    Builder
    Extensions / Conversions
    New Builds
    Call
  • Guy Building Services Ltd Logo

    Guy Building Services Ltd

    9.86

    (177 reviews)

    Operates in GU26

    Services & skills
    Builder
    Extensions / Conversions
    Brick / Concrete Structural Repairs
    Partition Walls
    Structural Steels
    Call
  • Buildtonic Ltd Logo

    Buildtonic Ltd

    9.67

    (11 reviews)

    Operates in GU26

    Services & skills
    Builder
    Extensions / Conversions
    Sustainable Construction
    Period Property Restoration
    New Builds
    Call
  • GR8 Construction & Carpentry Ltd Logo

    GR8 Construction & Carpentry Ltd

    10.00

    (46 reviews)

    Operates in GU26

    Services & skills
    Builder
    Extensions / Conversions
    Workshop Design / Construction
    Fire and Flood Renovation
    Project Management
    Call
  • Jw Construction & Civil Engineering Ltd Logo

    Jw Construction & Civil Engineering Ltd

    10.00

    (20 reviews)

    Operates in GU26

    Services & skills
    Builder
    Extensions / Conversions
    Sustainable Construction
    Mastic Sealant
    Concrete Garages
    Call
  • Multibuild Construction

    10.00

    (141 reviews)

    Operates in GU26

    Services & skills
    Builder
    Extensions / Conversions
    Concreting
    Brick / Concrete Structural Repairs
    Refurbishments
    Call
  • ELV CONSTRUCTION & MAINTENANCE LTD Logo

    ELV CONSTRUCTION & MAINTENANCE LTD

    10.00

    (3 reviews)

    Operates in GU26

    Services & skills
    Builder
    Extensions / Conversions
    Concreting
    Core Drilling
    Equestrian Stable
    Call
  • LM Renovations Logo

    LM Renovations

    9.83

    (82 reviews)

    Operates in GU26

    Services & skills
    Builder
    Extensions / Conversions
    Core Drilling
    Garage Conversions
    Foundations
    Call
  • PPM Property Services Logo

    PPM Property Services

    9.12

    (17 reviews)

    Operates in GU26

    Services & skills
    Builder
    Extensions / Conversions
    Green Oak Framing
    Brick / Concrete Structural Repairs
    Agricultural Building
    Call
  • Andy Spence Builder

    (0 reviews)

    Operates in GU26

    Services & skills
    Builder
    Extensions / Conversions
    General Building
    Emergency Builder Service
    Demolition
    Call
  • National Builders Limited Logo

    National Builders Limited

    7.65

    (40 reviews)

    Operates in GU26

    Services & skills
    Builder
    Extensions / Conversions
    Loft Conversions
    Garden Studios
    Garage Conversions
    Call
  • Services & skills
    Builder
    Extensions / Conversions
    Green Oak Framing
    Project Management
    Garage Conversions
    Call

Conversion and extension builders in GU26

Planning a loft conversion, garage makeover or full house extension in GU26? 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 GU26

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 GU26

Our checked tradespeople in GU26 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

Costs to expect

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

Single - storey extensions: £21,000 - £65,000

Double - storey extensions: £55,000 - £95,000

Loft conversions: £35,000 - £65,000

Garage conversions: £8,000 - £20,000

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 GU26: 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 GU26

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 GU26? Enter your postcode or post a job to find emergency services in your area.

Find the right extension or conversion specialist in GU26

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

Looking for more tradespeople in GU26?

Find Checkatrade reviewed Tradespeople, get a quote today, discover related services in GU26 and check out our latest home improvement guides.