Restoration, Conservation, Cob & Lime Specialists
At A1 Complete Builders, our Extensions & Annexes service is about adding space, functionality and value to your property with designs that flow naturally from your existing home. Whether you’re planning a kitchen extension, a sun-filled orangery, a garden room or a self-contained annexe, we focus on seamless integration—ensuring new works reflect your home’s character, proportions, materials and aesthetic.
From initial design and planning permission to foundations, roofing, joinery, plumbing, electrics and finishes, our experienced team manage every stage. We collaborate closely with you to understand how you live, work and want to use your new spaces—maximising comfort, light, accessibility and energy-efficiency. The result is an extension or annexe that feels like a natural part of your home rather than an add-on. With meticulous workmanship and attention to detail, A1 Complete Builders delivers high-quality, durable additions that enhance both lifestyle and resale value—making your vision a reality.
Our client instructed A1 Complete Builders to construct a new kitchen extension at their property in Perranuthnoe, near Penzance, designed specifically to accommodate a hardwood orangery supplied by Vale Gardens. The result is a beautifully crafted, light-filled space that seamlessly blends traditional materials with elegant architectural detailing.
The extension features expertly built stonework at its base, harmonising with the existing structure and grounding the orangery in its Cornish surroundings. Above this, expansive timber-framed glazing creates a striking contrast while allowing uninterrupted views of the garden and surrounding countryside. The hardwood joinery has been painted in a soft, neutral tone that reflects light and complements the natural stone exterior.
At the heart of the structure is a large, pitched glass roof lantern that defines the space both internally and externally. This lantern not only enhances the visual impact of the orangery but floods the kitchen with daylight from above, creating an uplifting and welcoming atmosphere throughout the day. Subtle roof venting is incorporated to support passive ventilation.
Inside, the kitchen is being fitted out to a high standard. White hexagonal tiles are being installed across one main wall, forming a stylish backsplash above a double farmhouse sink and range cooker. Electrical and plumbing preparations are well underway, and the room layout allows for both functionality and elegance.
Floor-to-ceiling windows and French doors connect the orangery kitchen with the garden, creating a seamless indoor-outdoor transition. As work progresses toward completion, the extension is on track to become a standout feature of the home—blending timeless design with everyday practicality.
This project highlights the high level of craftsmanship and attention to detail that A1 Complete Builders bring to every stage of a bespoke extension build.
A1 complete builders have been instructed to undertake a Garden Room Annexe in Trevissome in 2022.
A1 complete builders have been instructed to restore Goldmartyn to its former glory adding a rear extension.
A1 complete builders have been instructed to undertake a single storey Extension by RTP Surveyors due to soft ground Saxtons drilling have drilled piles 9 meters in to bed Rock. December 2021
Recently acquired property in St. Erme under Alteration and Extension being built.
A1 complete builders have been instructed by RTP Surveyors to undertake a large Renovation project in Mawnan Smith
A1 Complete Builders was highly recommended to undertake a Renovation of an old farm house now split and build a new kitchen Extension. Longdowns, Nr Falmouth
A1 Complete Builders received an instruction to demolish an old Victorian conservatory and replace it with a new wedge shaped conservatory. A1 Builders were recommended by an existing client who were delighted with the conservation work they had previously carried out for them.
A1 Builders received this instruction after the client vetted builders from the Federation of Small Builders (FMB) who then went on to win the contract in Feb 2020.
Complete Builders own self-build. One bedroom with en-suite, timber framed annexe.
A1 complete builders received an instruction to build a first floor bedroom extension and construct two dormers in the main farm house.
Scope of works was to remove an existing Delabole slate roof and set aside. Shutter and pour a reinforced ring beam around the perimeter. Build a timber frame first floor bedroom finished with powder coated aluminium windows and Ceder cladding class B. Fit internal stair case and tongue and groove timber to vaulted ceiling. Dormers constructed with steel A frames and timber frame with Ceder cladding finish to the external with aluminium windows.
We were recommended and then awarded the contract to build this two storey timber frame extension in Truro to accommodate a new Kitchen/Dinner + Two new Bedrooms and two new bathrooms. Plumbing was carried out by Ollies Plumbing and Heating and Electrics by York Electrics.
All other work carried out by A1 Complete Builders.
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