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Chesterfield building contractors since 2002

One call to G&K does it all.

Extensions, loft conversions, new builds and more across Chesterfield and Derbyshire. A family-run team that oversees every project personally, from design and planning through to completion.

Call 01246 861 222 Get a free quote
Since 2002Family-run in Chesterfield
40+ yearsTrade experience
65%Repeat & referred work in 2024
Derbyshire Trusted Trader
Fully insured team
One call does it all
Any size, garden wall to development
What we do

From a garden wall to a full development.

Design and planning through to completion, all personally overseen. We take on jobs of any size.

Popular project

Loft Conversions

Turning empty loft space into a fully usable room: stairs, insulation, stud walls, plastering, electrics and new glazing. See the Wingerworth project below.

Extensions

Single and double storey extensions, built and project-managed from foundations to finish.

New Builds

New homes and commercial builds, from a single property to multi-plot housing developments.

Garage Conversions

Converting and adapting garages into warm, usable rooms, or widening and rebuilding the garage itself.

Driveways & Patios

Block paving, driveways, patios and hard landscaping laid to blend with your home and last.

Renovations & Repairs

Full refurbishments, roofing repairs, repointing, cladding and general building work, big or small.

Featured project

Loft conversion, Wingerworth

A full dormer loft conversion from first fix through to a finished, weathertight shell. Drag the slider to see the transformation, from exposed timber roof structure to a clad dormer with fitted windows.

"Scaffolding down, shell completed on this loft conversion in Wingerworth."G & K Developments Ltd, project update

Discuss your own project
Finished loft conversion dormer with black cladding and fitted window, Wingerworth
Loft conversion timber roof structure mid-build, before cladding and glazing
Before After
In their words

Trusted by Derbyshire homeowners.

A few of the reviews left on the Derbyshire Trusted Trader website.

"We were very impressed from the start due to Graham's open and transparent discussions and quote, which gave us the confidence to proceed with our extension. Communication remained strong throughout the project, and the workmanship was very good, from all the trades involved."

ExtensionReviewed 2025

"G&K converted our loft space from an empty shell to a readily accessible multi-functional room. Their attitude and craftsmanship were excellent throughout. They started on time, kept us informed of progress, and if they did encounter a problem, they suggested solutions. A stress-free project."

Loft conversionReviewed 2024

"G and K did an absolutely fantastic job with our garage conversion. Graham's quote, although not the cheapest, was by far the most detailed and professional. His communication was fantastic throughout, and all workmanship was completed to a high standard. Very happy customers!"

Garage conversionReviewed 2023

Reviews shown are taken verbatim from the Derbyshire Trusted Trader website.

Why choose us

A family business, run the way it started.

G & K Developments was founded in 2002 by Graham and Kathie Williams. Graham brings over 40 years in the building trade, starting out as a bricklayer before moving into site management, and still personally oversees every project today.

  • 01

    One call does it all

    From design and planning through to completion, your project is personally overseen, no matter how small the job.

  • 02

    Honesty and transparency

    We value honesty, integrity and openness in everything we do. Detailed quotes up front mean no surprise costs later.

  • 03

    Punctual, polite, professional

    A fully insured, highly skilled team who turn up on time, keep the site tidy and treat your home with respect.

  • 04

    Work that comes back

    In 2024, 65% of our work came from recommendations or repeat customers. Our reputation does the talking.

Completed dormer loft conversion with solar panel roof
Derbyshire Trusted TraderBuilding in Chesterfield since 2002
Where we work

Chesterfield and across Derbyshire.

Chesterfield Clay Cross Wingerworth Brampton Derbyshire
Get in touch

Tell us about your project.

Call, message on WhatsApp, or send a few details below and we'll get back to you to arrange a visit.

01246 861 222Mon to Fri, 8.30am to 5.00pm
WhatsApp 07715 102165Send photos of the job
enquiries@gandkdevelopments.comWe reply within a day or two
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