Construction services in Anglesey
AJ Building Contractors provides professional construction services in Anglesey, delivered by a family-run team with over 50 years of combined experience. Based in Llanerchymedd, we specialise in refurbishments, extensions and new builds, with most work completed fully in-house for consistent quality. We follow strict safety standards, offer clear pricing and provide free quotes for all our projects.
Our core service benefits
- Over 50 years of combined construction experience
- All major work completed in-house for full project control
- Fully trained and certified in safety, compliance and crane operations
- Free, detailed estimates with transparent pricing
- 5-star rating on Google based on verified customer reviews
Contact us to arrange a consultation or request your quote now.
Comprehensive Construction Services in Anglesey
Our team delivers a full range of construction services, supporting everything from structural works to complete home transformations. Every project is managed with accuracy, safety and a commitment to high-quality workmanship.
Below is an overview of the main services available.

House extensions
Extensions are one of our most requested construction services in Anglesey, providing additional space for growing families or owners wanting improved layouts. We complete all structural, groundwork and finishing elements, ensuring a seamless extension that matches the style of your existing home.
Types of extensions we deliver
- Single-storey extensions
- Double-storey extensions
- Garage conversions
- Loft and rear extensions
- All groundwork, drainage and structural elements
Extensions can significantly improve both functionality and property value when designed and built correctly.

New build homes
We manage full new build projects from planning to completion. We specialise in bespoke homes rather than volume housing, ensuring every detail is completed to a high standard.
Our new build capabilities
- Full site setup and preparation
- Groundworks and drainage installation
- Brickwork and roofing
- Interior joinery, plastering and decorating
- Full build management and safety compliance
We have the capacity to deliver large detached homes with project values up to one million pounds per year, depending on scheduling and labour availability.

Home refurbishments
Our home refurbishments help homeowners upgrade, modernise and transform existing properties. These projects often involve full or partial interior remodelling, repairs and structural improvements. Recent refurbishment projects completed by the team totalled around four hundred thousand pounds, demonstrating our capability to deliver high-value works with precision and efficiency.
What our refurbishment work includes
- Internal structural alterations
- Kitchen renovations
- Bathroom renovations
- Window and door replacements
- Roof repairs and internal finishing
- Modernisation of older homes
Refurbishments are ideal for families wanting to enhance their living space without moving home, and for homeowners seeking to improve both comfort and property value.
Additional construction services
Alongside our primary services, we provide a full suite of supporting construction services tailored to different property needs.
- Garage conversions: Convert unused garage space into functional living areas, offices or additional rooms.
- Window and door replacements: High-quality installation of new uPVC or timber windows and doors.
- Fascia and soffit replacements: Enhancements to protect and improve the appearance of your property exterior.
- Groundworks and drainage: Precision groundwork including excavation, levelling, ducting and drainage installation.
- Structural work: Steel installations, concrete foundations and all structural supports.
- Civil engineering: Experience delivering medium-scale civil works, including a notable project supporting a solar canopy installation for Anglesey County Council.

Why Choose Our Construction Services in Anglesey
- Family business with consistent leadership
- Fully DBS checked
- Extensive health and safety training
- Crane lift qualifications, including load calculations
- Experienced in working on regulated and highly compliant sites
- Debt-free business model for financial stability
- Clear communication and transparent costing
These qualities create a smooth, predictable and well-managed experience for every customer.
Frequently asked questions
Do you offer full project management?
Yes, we manage every stage of the construction process, including planning, groundwork, structure, finishing and compliance.
Which areas do you cover?
We serve Llanerchymedd, wider Anglesey and nearby areas in Gwynedd including Porthmadog, Pwllheli, Caernarfon and Bangor.
Are you qualified and insured?
Yes, the team holds extensive training and certification, including qualifications for crane lifts, safety compliance and advanced joinery.
Do you provide free estimates?
Yes, we offer free quotes with clear pricing and no obligations.
Get a Free Quote Today
If you are planning a refurbishment, extension, new build or structural project, our team is ready to help. With decades of experience and a dependable family-led approach, AJ Building Contractors is a trusted choice for construction services in Anglesey.
Telephone: 01248661401
Mobile: 07414296131
E-mail: info@ajbuildersltd.uk
Address: 15 Bryncir Estate, Llannerchymedd, Anglesey, LL71 8EQ.
If you would like to send us an enquiry please fill out the below form with your contact info and message.
