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lean to conservatory in Gwynedd (6)

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  • M Davies Builders (NW) Ltd Logo

    M Davies Builders (NW) Ltd

    9.85

    (38 reviews)

    Operates in Gwynedd

    Services & skills
    Builder
    Extensions / Conversions
    Garage Conversions
    Call
  • Kieran Ashton Logo

    Kieran Ashton

    10.00

    (1 review)

    Operates in Gwynedd

    Services & skills
    Builder
    Extensions / Conversions
    General Building
    Foundations
    Wall Tie Replacements
    Call
  • Allan Ball Building Contractors Logo

    Allan Ball Building Contractors

    9.92

    (102 reviews)

    Operates in Gwynedd

    Services & skills
    Builder
    Extensions / Conversions
    Concrete Garages
    Loft Conversions
    Agricultural Building
    Call
  • Alec Roberts Building Limited Logo

    Alec Roberts Building Limited

    9.67

    (7 reviews)

    Operates in Gwynedd

    Services & skills
    Builder
    Extensions / Conversions
    Core Drilling
    Demolition
    Basement / Cellar Conversions
    Call
  • L Haworth Landscaping & Construction Logo

    L Haworth Landscaping & Construction

    9.99

    (150 reviews)

    Operates in Gwynedd

    Services & skills
    Builder
    Extensions / Conversions
    New Builds
    Agricultural Building
    Mastic Sealant
    Call
  • G V Joinery & Building Contractor Ltd Logo

    G V Joinery & Building Contractor Ltd

    9.50

    (6 reviews)

    Operates in Gwynedd

    Services & skills
    Builder
    Extensions / Conversions
    Basement / Cellar Conversions
    Emergency Builder Service
    Brick / Concrete Structural Repairs
    Call

Conversion and extension builders in Gwynedd

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

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 Gwynedd

Our checked tradespeople in Gwynedd 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 Gwynedd: 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 Gwynedd

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

Find the right extension or conversion specialist in Gwynedd

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 Gwynedd?

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