Extension specialists
Poole & Dorset's Complete Home Extension Service: From Design to Build, or Any Stage in Between.
Fixed Pricing, No Surprises
Flexible Packages to Suit You
Tailored to Your Budget and Vision
Some of our happy customers
EXCELLENT rating
Based on 13 reviews Called Josh in to draw up some plans and come up with some ideas for a small extension. Josh was prompt in getting in touch and carried out layout drawings for a very reasonable amount. Josh also gave us a budget price to carry out the works. Lee Bryant2024-08-04 Couldn’t recommend plan build enough. Josh was so knowledgeable and quick to respond to my messages. He kept our budget in mind while helping us achieve the plans we wanted for our house. Wouldn’t hesitate to use plan build again in the future Abi Longhurst2024-01-30 I couldn't reccomend Josh enough! He has been absolutely fantastic, nothing was too much trouble, he was happy to bounce lots of ideas back and forth until we were happy. He is polite, friendly and professional in every aspect. I would definitely be using his services again in the future when needed. Kirsty Herridge2024-01-05 Josh was very pleasant to work with, he has always been responsive and easy to contact. He carried out our technical drawings for us and got them back quickly for us. I would recommend using Josh and will be using him in the future. Emily Alford2023-09-05 Josh , the person running the job for us provides great service, knows what we wanted and will give helpful insights wherever he could. Always quick to reply and answer questions we had, no matter how minor they would be. We acquired the plans quickly which only needed a few adjustments and sent them off just as fast. Highly recommend. Matthew Sha2023-08-25 Attentive, cost effective and reliable. Plan Build have gone above and beyond with my build and would never hesitate to recommend Ryan Cooper2023-05-11 Was absolutely over the moon with the work Josh done for us can’t recommend him highly enough Ben Read2022-08-12 Josh got the plans for our extension completed and submitted very quickly. We had a number of amendments and obstacles to overcome but nothing was too much trouble for him. A very professional and efficient service. Lester Morgan2021-02-18 This company undertook a garage conversion forming two rooms for me - an office and utility room. They took over the project and managed it from start to finish, including obtaining Building Regulations Certificate. They were efficient, courteous, polite and, above, all, very professional. I cannot recommend this company highly enough. Thank you - I love my new space! Mandy Heath2021-02-11
Plan Build: The Smarter Way to Build
Without Plan Build
❌ Multiple companies working independently, causing miscommunication
❌ No single point of responsibility when things go wrong
❌ Contractors insisting on all-or-nothing work, limiting flexibility
❌ Hidden costs and unexpected delays
❌ Designs and builds disconnected, leading to missed details
With Plan Build
✅ A single team under one roof—designers, engineers, and contractors working together
✅ One point of contact—no passing the blame
✅ Flexible options—partner with us for the whole project or bring in your own skilled friends and family
✅ Fixed pricing for each stage—know exactly what your project will cost
✅ Seamless design-to-build process—problems solved as we go
Take control of your renovation !
A renovation experience built for you. Plan Build brings simplicity, flexibility, and expert care to every project
Still Have Questions? Let’s Talk!
Connect with our experts now to discuss how we can tailor our approach to meet your unique renovation needs
we simplify Home Renovations, One Step at a Time
Choose the Support You Need, From Start to Finish—or Anywhere in Between.
Step 1 - Let’s Talk About Your Project
Before anything else, let’s have a call to discuss your project. We’ll take the time to understand your goals and ensure we’re the right fit for your needs. By focusing only on projects we excel at, we guarantee quality and expertise from start to finish.
0800 0567069
Step 2 - Design Discovery

Once we’ve agreed on the scope, we’ll start with a Design Discovery. This service includes creating tailored floor plan options to show how your property can be improved while staying aligned with your budget, timeline, and vision.
To ensure the plans are just right, we finish with a live design review. During this collaborative video call, we make any final adjustments together, allowing you to have real-time input and see your vision come to life.
This process ensures you feel confident and fully involved in shaping the next step of your home improvement journey
Step 3: Planning Permission

If your project requires planning approval, we’ll handle the application process for you. From preparing the necessary documents to liaising with local authorities, we’ll ensure everything is submitted accurately to avoid delays.
Step 4: Building Regulation plans
You may already have planning drawings approved, and it’s not uncommon for a separate company to draft the building regulation plans. However, this stage is critical—it’s the final chance to refine your design before construction begins.
At Plan Build, our unique combination of construction expertise and design experience brings a fresh perspective to your project. We review and optimise your plans, identifying opportunities to design out unnecessarily expensive elements. Simple amendments at this stage can often save you thousands without compromising your overall design.
Step 5 - Build Cost
Construction projects often come with unexpected surprises—rising costs, inaccurate quotes, and frustrating delays. Many homeowners experience the bait-and-switch approach: an enticingly low estimate upfront, only to face inflated costs halfway through the build.
At Plan Build, we do things differently. With our fixed fees and accurate estimates, we prioritise honesty and transparency from the start. Our best price first approach means you know exactly where you stand before any work begins—no hidden costs, no surprises.
We believe in building trust as much as we build homes. Let’s make your project stress-free and straightforward.
Step 6: Construction
With everything approved, we’ll begin the construction phase. Our team will coordinate every aspect of the work to keep the project on track. While construction can be disruptive, we’ll do our best to minimise any inconvenience to your daily life.
We’ll keep you regularly updated with progress and major milestones, ensuring you’re always informed and confident about the next steps. Our goal is to deliver the results you’ve envisioned with as little stress as possible
Our home renovation services
Design discovey
Discover the Potential of Your Home With Our Design Discovery Service
Your renovation journey starts here—with a simple, low-cost way to explore your home’s true potential. Our Design Discovery Service gives you the expert guidance and initial plans you need to bring your ideas to life without committing to a full project.
Whether you’re considering an extension, loft conversion, or internal reconfiguration, this service is designed to help you visualise what’s possible, understand the process, and make confident decisions about your home.
planning applications
Plan Build: Your Partner for Planning Permission Success
At Plan Build, we approach every project with a “design-to-build” mindset
From the very first line on the plan, we think about how your project will be built—ensuring your design is practical, cost-effective, and avoids spiralling expenses.
When it comes to planning permission, cheap drawings often lead to expensive problems. They might seem like a bargain initially, but poorly thought-out designs can result in delays, rejected applications, and costly construction challenges further down the line.
With years of experience securing planning permission for ambitious projects—such as Grand Designs homes and large apartment developments—we’ve honed our expertise. Today, we focus exclusively on helping homeowners like you. We bring the same level of precision and creativity to craft efficient, stunning designs that reflect your vision and achieve planning approval.
What We Offer:
- End-to-End Service: From the initial survey to final negotiations with the council, we manage every step of the planning process for you, ensuring a seamless experience.
- Practical Designs That Work: We prioritise efficiency, functionality, and cost-effectiveness over flashy, impractical designs. Our focus is on creating solutions that simplify construction and make the best use of your budget—not inflating it to showcase our portfolio.
- Proven Expertise for Homeowners: Drawing on our experience with large-scale projects, we now specialise in helping homeowners achieve their dream spaces with practical, approval-ready designs.
Start Your Project the Right Way—Request a Free Desktop Survey
Take the first step with a no-cost property assessment. We’ll uncover your project’s potential, identify challenges, and provide expert advice to help your vision move forward with confidence
Professional Accreditations & Memberships




Precision and Compliance Assured
Building Regulation Plans
Building regulation plans are far more detailed than standard planning permission drawings—they’re the blueprint for how your project will actually be built. Poorly thought-out plans can lead to costly delays, wasted time on site, and endless frustrations. That’s why at Plan Build, we take a different approach.
Our process starts with creating a digital model of your property, allowing us to consider every detail. From ensuring there’s enough space between a door and a light switch to aligning building materials for efficiency, we focus on the seemingly small things that make a big difference on-site.
What sets us apart is our combined expertise in design and construction.
- Construction Experience: Our knowledge of the building process translates into detailed, efficient plans that make construction smooth and problem-free.
- Design Expertise: With practical and efficient solutions, our plans don’t just comply with regulations—they’re designed to save time and costs during construction.
- Attention to Detail: Simple details, like setting buildings out to brick dimensions for full bonds, mean your build avoids unnecessary setbacks and wasted effort.
We manage every element of the process, ensuring your building regulation plans are both practical and buildable. With our experience and expertise, you can trust that your project will meet regulations while minimising hassle on-site.
Complimentary Design Review
As part of our service, we offer a free design review to ensure your project is as efficient as possible. Simply send us your plans, and we’ll arrange a video call to go through them in detail, offering suggestions and feedback to improve your design. It’s a no-obligation way to see how our expertise can help bring your project to life.
Engineering Design
From Simple Knock-Throughs to Full Structural Plans
Whether you’re planning to knock out an internal wall to create an open-plan space or need a complete engineering design for your home extension, we’re here to help. At Plan Build, we combine years of experience with the latest structural analysis software to produce fully compliant engineering plans that meet building regulations.
We understand that managing multiple professionals for different stages of a project can be overwhelming. That’s why we don’t just stop at design. We can handle your building regulation application, oversee the approval process, and even manage the installation of new beams and structural elements.
By offering an end-to-end solution for structural engineering, we save you time, effort, and the hassle of sourcing additional contractors. With our expertise in home renovations, extensions, and loft conversions, you can trust us to provide reliable and efficient support for your project.

Your trusted partner for comprehensive design and build services
Where your home dreams meet reality. We blend precision design with expert construction, ensuring each project reflects your vision and needs. Entrust us with your aspirations, and we’ll bring them to life with dedication and craftsmanship
Our Vision
To safely construct projects for the benefit of our valued clients, underpinned by family values and excellent delivery.
Our Mission
To be our clients' favourite choice for home transformations, striving daily to innovate and simplify the path to their dream home.
Our Process
Review, Research, Refine, Repeat: Our commitment to consistently enhance the way we serve our customers
FAQ
What is included in the Design Discovery package
Our Design Discovery package includes a detailed site survey using 3D laser measuring equipment, an in-depth discussion to understand your wishlist and budget, and up to three tailored floor plan ideas to optimise your home’s potential.
How long does it take to receive the initial design concepts
We typically provide the initial design concepts within 7-10 business days post our design discovery session, ensuring each design is tailored to meet your specific needs and expectations.
Do you handle planning permissions and regulations?
Yes, we manage the entire process of obtaining necessary planning permissions and ensuring that your design adheres to all local and national building regulations.
Can I make changes to the designs once they are drafted?
Absolutely, we encourage feedback and revisions to ensure the final designs align perfectly with your vision, needs, and budget.
Do you only work on residential projects?
While we specialise in home extensions and renovations, we have the expertise to take on a variety of projects. Feel free to contact us to discuss your specific needs.
What if I already have a design in mind?
We’re happy to work with your existing plans and can offer an expert second opinion to potentially enhance and optimize your initial design, ensuring it meets all practical and aesthetic requirements.
How do I start my home renovation journey with you?
Begin by scheduling a discovery phone call with us. Once we have an initial understanding of your needs and vision, we’ll offer a free site visit to further assess the potential of your space and discuss the next steps in detail
What sets you apart from other design and build firms?
Our unique blend of detailed, tech-advanced design processes and practical building expertise ensures each project is handled with utmost precision. We are dedicated to tailoring each project to the specific needs and visions of our clients, ensuring a personalised, high-quality result.