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Business Details
41 Years
experience
Trusted Builders in High Wycombe for Extensions & Renovations
Established in 1985, Castle Building is a family-run business based in High Wycombe with over 35 years of experience in the construction industry. Our directors, who trained as a bricklayer and carpenter respectively, lead a hands-on team committed to delivering high-quality building solutions. Specialising in domestic extensions and general building alterations, we prioritise reliability, transparency, and craftsmanship. As members of the Federation of Master Builders, we adhere to rigorous standards of workmanship and customer service, with all projects fully guaranteed.

Our approach ensures we remain on-site at all times, avoiding the common pitfalls of subcontractor dependency. We provide detailed, honest estimates without hidden costs and require no deposits, with payments only commencing once work begins. Our portfolio spans South Buckinghamshire, Berkshire, and Oxfordshire, serving both residential and commercial clients.
Services
Extensions Loft Conversions Listed Buildings Alterations Kitchens Bathrooms
Details
  • Year established: 1985
Highlights and features
  • We have over 35 years of experience in construction
  • We are on-site at all times
  • No deposits required
  • Members of the Federation of Master Builders
  • Competitive estimates with honest pricing
Associations and certifications
  • Federation of Master Builders
Services
Extensions
We specialise in creating functional, aesthetically pleasing extensions that enhance property value. Our process includes detailed planning, quality materials, and seamless integration with existing structures. Clients benefit from our hands-on management and over 35 years of expertise.
Loft Conversions
Our loft conversions maximise unused space, offering cost-effective solutions for additional living areas. We handle planning permissions, structural requirements, and finishing touches. Clients receive tailored advice and guaranteed compliance with building regulations.
Listed Buildings
We preserve historical integrity while undertaking repairs and alterations on listed buildings. Our team blends traditional techniques with modern compliance standards. This service ensures sensitive modifications that respect architectural significance and local authority guidelines.
Kitchens
From design to installation, we deliver bespoke kitchen solutions using leading brands. Our service includes tiling, plumbing, and joinery, ensuring functional and stylish results. Clients enjoy a stress-free process with transparent pricing and no hidden costs.
Bathrooms
We supply and install premium bathroom suites, combining expert plumbing with finishing touches. Our approach prioritises durability and aesthetics, with full project management from tiling to decorating. Clients benefit from competitive quotes and guaranteed workmanship.
Questions
What areas do you cover?
We operate in High Wycombe, Amersham, Beaconsfield, South Buckinghamshire, Berkshire, and Oxfordshire.
Are you insured?
Yes, we have full Public Liability Insurance coverage for all projects.
Do you require a deposit?
No, we do not take deposits. Payments begin once work commences.
How long have you been in business?
We have over 35 years of experience, established in 1985.
Can you handle listed building projects?
Yes, we specialise in repairs and alterations for listed buildings with local authority compliance.
Are you part of any accreditation schemes?
We are members of the Federation of Master Builders, ensuring high standards of workmanship.