Chief Architectural Ltd

Architectural Design for Loft Conversions & Extensions

As a specialist architectural company with over 25 years of experience, Chief Architectural Ltd is dedicated to providing exceptional design services to our clients in Portsmouth and beyond. Our team of highly skilled architectural surveyors have a wealth of knowledge and expertise in designing residential loft conversions and extensions, and we are committed to streamlining the design process to deliver professional quality construction plans and structural calculations.

At Chief Architectural Ltd, we believe every project is unique and should reflect the individual style and needs of our clients. Whether you're looking for a traditional or contemporary design, we have a track record of delivering beautiful architecture that exceeds our clients' expectations. Using the latest Digital CAD drafting technology, we can create detailed and accurate plans for even the most complex of projects.

Are you looking to make the most of the space in your home? Perhaps your loft is gathering dust and could be transformed into your new master bedroom, office, or games room for your family. Or maybe your kitchen is too small and could become your new open plan focal point for your family, impressing your friends with a chic new makeover. Whatever your needs and desires, we can achieve your vision.  Don't let valuable space in your home go to waste. Let Chief Architectural Ltd help you make the most of the home you already have. We are dedicated to providing our clients with exceptional service and delivering projects on time and within budget.

We offer a free consultation to discuss your project and explore your options. Complete the CONTACT form and we will get back to you, or, call us on 023 9270 6132.

We look forward to hearing from you and bringing your dream project to life.

Loft Conversions & Extensions

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Chief Architectural Ltd


A flat roof dormer is a type of dormer that is commonly used in loft conversions. It involves extending the existing roof structure vertically, creating additional headroom and floor space within the loft area. The flat roof dormer is called as such because the roof of the dormer is flat, as opposed to a pitched roof dormer which has a sloping roof. The flat roof dormer typically has a simple, rectangular shape and is often used to add both headroom and floor space to the loft area. One of the main advantages of a flat roof dormer is that it provides maximum interior space and natural light to the converted loft. It can also be a cost-effective option as it involves less construction work than other types of dormers. However, it's important to note that a flat roof dormer may not be suitable for every property, as it can affect the overall aesthetic of the building. Additionally, flat roofs may require more maintenance than pitched roofs due to water pooling and drainage issues. Overall, a flat roof dormer can be a great addition to a loft conversion, providing additional space and natural light. However, it's important to consult with an experienced architectural surveyor to determine if a flat roof dormer is the best option for your specific property and loft conversion needs.


A rear extension to a home extending the living space of a property outwards from the rear of the existing building. This type of extension is commonly used to add extra space to a property, particularly in areas where space is limited. A rear extension with 27 square metres of living space would provide a significant increase in the usable space of the property. The size of the extension may vary depending on the specific needs of the homeowner, the size of the property, and the local planning regulations. The additional living space created by a rear extension can be used for a variety of purposes, including a larger living room, dining area, or kitchen. It can also provide space for an additional bedroom, home office, or playroom for children. When planning a rear extension, it's important to consider a number of factors such as the design of the extension, the materials to be used, and any required planning permissions. A skilled architectural surveyor can help guide homeowners through the process of planning and constructing a rear extension, ensuring that all necessary requirements are met and the end result meets the needs of the homeowner.


A loft conversion and extension in Portsmouth to add extra space to a property without having to move home. The loft conversion involves converting an existing attic space into a usable living space, a bedroom. The extension involved building an additional space onto the existing property to the side of the building.


A modern extension design is typically characterised by sleek, clean lines, minimalist features, and a focus on natural light and open space. Some popular design elements include floor-to-ceiling windows, sliding glass doors, and open-plan living spaces that seamlessly connect indoor and outdoor areas. A modern extension may also incorporate eco-friendly features, such as solar panels, green roofs, and energy-efficient windows and insulation. The use of sustainable materials, such as reclaimed wood and recycled steel, is also common.

At Chief Architectural Ltd we understand the context surrounding local planning, building regulation policies & structural design. Local planning policies mainly focus on the aesthetics of the design & building regulation policies focus on the practical & structural design. We aim to fulfil both the aesthetic & practical designs required for a successful outcome. The aesthetic values to our Architecture is one of the principal aspects we consider when designing a project. The practical values to our Architecture are durability & costs to construct our designs. The key for a successful design is keeping it site specific & within a sustainable framework design. Sustainable framework design will reduce negative impacts on the environment, promoting the health & comfort of the building occupants, resulting in improved building performance. Incorporating aesthetic & practical values, durability & a sustainable framework in architecture will distinguish an excellent building performance from a poor building performance.


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What Does An Architect Do?

Loft Conversion or Extension?

Designing a loft conversion or extension is a complex process that requires the expertise of an experienced architect. Here are the steps an architect may take when designing a loft conversion or extension:

  1. Site Visit and Assessment: The architect will visit the property to assess the feasibility of a loft conversion or extension. They will check the existing structure, roof height, the site conditions, and the orientation of the building to determine if a conversion or extension is possible and to gather information about the building's style, materials, and surroundings.
  2. Briefing and Concept Design: The architect will discuss the client's requirements and preferences for the loft conversion or extension. This will include the intended use of the space, the style and materials to be used, and any specific needs or requirements. Based on this information, the architect will create a concept design, which includes initial drawings, plans, and elevations.
  3. Planning Permission and Building Regulations: The architect will check if planning permission is required for the loft conversion or extension and will advise the client on the process for obtaining this. They will also ensure that the conversion or extension meets building regulations and will submit the plans to the relevant authorities for approval.
  4. Detailed Design: Once the concept design has been approved, the architect will begin to create detailed drawings, specifications, and schedules. These will include detailed plans for the layout, structural design, materials, and finishes to be used in the loft conversion or extension.
  5. Construction Documents: The architect will create detailed construction documents that provide the builder with all the information they need to complete the loft conversion or extension. These documents will include drawings, schedules, specifications, and details of all the materials and finishes to be used.
  6. Construction Administration: During the construction phase, the architect will oversee the project to ensure that the work is being carried out according to the plans and specifications. They will liaise with the builder and client to resolve any issues or concerns that arise and will conduct regular site visits to monitor progress.

In conclusion, an architect designs a loft conversion or extension by visiting the property, assessing its feasibility, creating a concept design, obtaining planning permission and building regulations approval, creating detailed design and construction documents, and overseeing the construction phase. By following this process, the architect ensures that the loft conversion or extension is designed to the client's requirements, meets all regulations and standards, and is constructed to a high standard.

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Architects Designing Portsmouth Developments

Portsmouth, a coastal city in the South of England, has a rich architectural history and has been home to many stunning homes and buildings over the years. As with any city, home design trends in Portsmouth have evolved over time, with architects playing a significant role in bringing these trends to life. Today, architects in Portsmouth are incorporating several exciting trends into their work, including loft conversions and extensions to residential properties.

Sustainability has become a major focus in Portsmouth's architecture industry, and architects are incorporating environmentally friendly designs into their work. When it comes to loft conversions and extensions, architects in Portsmouth are using eco-friendly materials and incorporating natural elements into their designs. Features such as Velux skylights and green roofs can be incorporated into loft conversions, while extensions can be designed with eco-friendly insulation and energy-efficient features.

Minimalism is another popular trend in Portsmouth's architecture industry, with architects creating functional and aesthetically pleasing spaces with clean lines and open spaces. Loft conversions and extensions can benefit from minimalist designs that maximise the available space while creating a modern, elegant look.

Flexible spaces have also become a popular trend in Portsmouth's architecture industry, with more people working from home and needing multi-functional spaces. Architects in Portsmouth are creating loft conversions and extensions that can be used for work, relaxation, and entertainment, with open floor plans and movable walls that allow for easy customisation and flexibility.

Smart home technology has become an essential part of modern living, and architects in Portsmouth are incorporating it into their designs for loft conversions and extensions. From automated lighting and heating systems to voice-activated appliances, smart home technology makes life more convenient and efficient. These features can be incorporated into loft conversions and extensions to make the space more comfortable and functional.

Finally, outdoor living spaces have become increasingly popular in Portsmouth in recent years, and architects are designing loft conversions and extensions that seamlessly blend indoor and outdoor spaces. With the city's coastal location and pleasant climate, residents are increasingly looking for outdoor living spaces to enjoy. Architects in Portsmouth can incorporate features such as balconies, terraces, and gardens into loft conversions and extensions, creating beautiful and functional spaces for homeowners to enjoy.

In conclusion, architects in Portsmouth are creating stunning designs for loft conversions and extensions that reflect the city's unique character and appeal. By incorporating trends such as sustainability, minimalism, flexible spaces, smart home technology, and outdoor living spaces into their work, architects are creating spaces that are not only functional and beautiful but also eco-friendly and efficient. Whether you're looking to add extra space to your home with a loft conversion or extension, working with a skilled architect in Portsmouth can help you achieve a space that meets your unique needs and reflects the character of this wonderful city.

Recent Updates

Our Latest News

An architect's drafting table with precision tools, including a ruler, pencils, and a blueprint. This image represents the meticulous planning and attention to detail that goes into our loft conversion designs.
A Loft Conversion in Portsmouth to a Bungalow

Elevating a Bungalow: A Stunning Loft Conversion Design in Portsmouth

Introduction: In the heart of Portsmouth, where coastal charm meets modern living, we embarked on an exciting journey to transform a humble bungalow into a spacious and luxurious abode. This loft conversion project is a testament to our commitment to excellence, blending innovative design with functional living spaces. Join us as we unveil the breathtaking features of this remarkable transformation.

A Room with a View: Velux Windows to Side Elevations One of the standout features of this loft conversion is the clever use of Velux windows on the side elevations. These roof windows not only flood the space with natural light but also provide picturesque views of the surrounding landscape. As the sun rises and sets, the play of light and shadow creates a dynamic and ever-changing ambiance within the rooms.Portsmouth Loft Conversion: Spacious 3-Bedroom Design with En-suite, Velux Windows, and Glass Gable Features

Architectural Elegance: Glass Gable Features The loft conversion’s front and rear elevations were adorned with stunning glass gable features. These architectural marvels not only add a touch of elegance to the exterior but also serve as portals for an abundance of natural light. As sunlight filters through the glass, it dances gracefully across the interior, creating a warm and inviting atmosphere that’s truly captivating.An architect's drafting table with precision tools, including a ruler, pencils, and a blueprint. This image represents the meticulous planning and attention to detail that goes into our loft conversion designs.

A Space for Everyone: Three Bedrooms A spacious loft conversion wouldn’t be complete without ample bedrooms. In this project, we’ve created not one, not two, but three beautiful bedrooms. Each bedroom boasts unique features and layouts, ensuring that every member of the household finds their perfect sanctuary within this transformed space.

Luxury in Every Corner: Ensuite Shower Room and Main Bathroom To enhance the convenience of daily living, we’ve included an ensuite shower room as part of this loft conversion. This private oasis is designed with sophistication and practicality in mind, offering a tranquil space for rejuvenation. In addition, a main bathroom provides additional comfort and convenience, catering to the needs of the entire family.

The Loft Conversion of Your Dreams This loft conversion design in Portsmouth is a testament to our dedication to creating living spaces that elevate the way you live. From the clever use of Velux windows to the architectural elegance of glass gable features, every aspect of this project is carefully considered to bring beauty, functionality, and comfort into perfect harmony.

Whether you’re dreaming of a loft conversion for your bungalow or envisioning a different transformation, Chief Architectural Ltd. is here to turn your ideas into reality. With over 25 years of experience, we specialise in creating accurate scaled drawings and ensuring compliance with planning permissions and building regulations. Contact us today to start your journey towards a loft conversion that will exceed your loftiest expectations.

Architect plans of a loft conversion and extension in Portsmouth by Chief Architectural Ltd
Transforming Spaces: Architect’s Vision for a Loft Conversion and Extension in Portsmouth

Transforming Spaces: Architect’s Vision for a Loft Conversion and Extension in Portsmouth

Introduction: Welcome to Chief Architectural Ltd blog, where we turn dreams into reality. Today, we delve into an exciting project we’ve undertaken, involving a 3-bedroom mid-terraced house in Portsmouth. Our team of architectural surveyors have meticulously crafted a design that encompasses a loft conversion and an extension, maximising space, functionality, and aesthetic appeal.Architect plans of a loft conversion and extension in Portsmouth by Chief Architectural Ltd

Forthcoming Loft Conversion: A Serene Retreat One of the key elements of this project is the loft conversion. With careful consideration, we have created a haven of tranquillity by adding an additional bedroom and an en-suite shower room. The rear elevation flaunts a flat roof dormer with a charming Juliet balcony, allowing ample natural light to illuminate the space. To complement this, the front elevation incorporates Velux windows, harmonising with the roof slope.

Permitted Development and Cubic Volume: This loft conversion design adheres to the permitted development rules. By ensuring that the cubic volume of the rear dormer remains under 40 cubic metres, we’ve created a design that can be constructed without the need for planning permission. This not only streamlines the process but also provides our clients with a hassle-free experience.

Seamless Integration: Staircase and en-suite placement to seamlessly blend the loft conversion with the existing layout, we meticulously designed the staircase to flow effortlessly with the existing structure. By positioning the en-suite in the corner of the rear dormer, directly above the first-floor bathroom, we’ve optimised the construction process, making it more efficient for the builders to construct!

Portsmouth Loft Conversion Design: When it comes to loft conversion design in Portsmouth, our architectural team understands the importance of preserving the character and charm of the local architecture. By working closely with clients and paying attention to the unique requirements of each property, we create designs that seamlessly integrate with the existing structure while adding value and functionality.

Forthcoming Extension: Embracing Open-Plan Living The next phase of this project involves a ground floor extension, designed under the permitted development rules. Our aim is to create a spacious family area, emphasising open-plan living. By skillfully extending the property, we provide ample room for socialising, relaxation, and entertainment.

Architect plans of a loft conversion and extension in Portsmouth by Chief Architectural Ltd

Permitted Development Rules for Ground Floor Extensions: When designing ground floor extensions under permitted development, there are important guidelines to follow. In the Portsmouth area, such extensions must not exceed certain limits, including the maximum depth of 6 metres for terraced houses. By adhering to these regulations, we ensure a smooth and efficient construction process while eliminating the need for planning permission.

The Heart of the Home: Kitchen Design Within this forthcoming extension, the kitchen plays a central role. Our design approach emphasises creating a kitchen space that is both functional and aesthetically pleasing. We carefully consider the layout, storage options, lighting, and material selection to create a kitchen that reflects our clients’ tastes and enhances their daily living experience.

Importance of Structural Calculations: At Chief Architectural Ltd., we prioritise safety and structural integrity. Therefore, as part of this loft conversion and extension design, our company carries out comprehensive structural calculations. These calculations ensure that the proposed modifications are not only visually appealing but also structurally sound, providing our clients with peace of mind and a solid investment.

Conclusion: The loft conversion and extension project in Portsmouth showcases our dedication to creating remarkable spaces that enhance both the aesthetic appeal and functionality of properties. Through careful design, adherence to permitted development rules, and consideration of our clients’ needs, Chief Architectural Ltd continues to exceed expectations, turning ordinary houses into extraordinary homes.

Architect plans of a loft conversion and extension in Portsmouth by Chief Architectural Ltd.

Architect plans of a loft conversion and extension in Portsmouth by Chief Architectural Ltd..

Chief Architectural Ltd 3D Architect CAD loft conversion and extension in Portsmouth.
Transforming a Detached House in Portsmouth: A Successful Loft Conversion and Extension Project

A Loft Conversion and Extension Project

If you are looking to add extra space to your home, a loft conversion and extension can be an excellent solution. Recently, Chief Architectural Ltd. had the opportunity to work on a project that involved adding a loft conversion and extension to a detached house in Portsmouth, UK. Here’s a brief overview of the project and how we approached it.

Designing the Loft Conversion

The loft conversion included a bedroom with an en-suite shower, a Juliet balcony, a rear elevation dormer, and a front elevation pitched roof dormer. Our team of professionals worked closely with the homeowners to design the new space to their specific requirements.

The bedroom with an en-suite shower was built to ensure optimal use of space while creating a comfortable and functional area. The Juliet balcony was designed to let in natural light and provide a stunning view of the garden. The rear elevation dormer was built to increase the floor area and create more headroom. Finally, the front elevation pitched roof dormer was designed to add a charming look to the property while providing more space inside.

Ensuring Health and Safety

During the construction of the loft conversion, our team ensured that all health and safety procedures were followed. We carried out regular inspections and made sure that the site was secure at all times. We also made sure that all work was carried out with minimal disruption to the homeowners.

Creating the Extension

The extension was designed to create an open-plan kitchen area by removing a wall, creating one large kitchen room. We also added aluminium bi-fold doors to open up the space and provide a seamless connection to the garden.

Our team of professionals designed the extension with the utmost care and attention to detail. We made sure that the design was in keeping with the existing style of the house and that the new space provided a practical and functional solution for the homeowners.

The aluminium bi-fold doors were designed to create a seamless connection between the indoor and outdoor areas. They were carefully installed to ensure that they provided an unobstructed view of the garden and allowed natural light to flood into the room.

Ensuring Health and Safety

The extension was also built with the same high standards of health and safety in mind. We made sure that all work was carried out in compliance with relevant regulations, and we took every precaution to ensure that the construction site was secure at all times.

Delivering Successful Results

In conclusion, the loft conversion and extension project carried out by Chief Architectural Ltd. in Portsmouth was a great success. The new space created by the loft conversion provided the homeowners with a comfortable and functional area, while the extension added extra space to the property and created a stunning open-plan kitchen area. All work was carried out to the highest standards of health and safety, and the final result was a space that the homeowners were delighted with.

If you’re considering adding extra space to your home, contact Chief Architectural Ltd. to see how we can help. Our team of professionals is experienced in all aspects of home renovation and can provide you with the solutions you need to create the home of your dreams.