Architectural design, planning & structural drawings — all in one place.
Xpanza brings design, planning applications and structural engineering together in one coordinated team. Get clear guidance and connected drawings from your first idea through to the next steps for building.
Answer a few quick questions to shape your project estimate.
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We handle the technical side, you handle the rest
Xpanza is a UK based architectural design company built around one idea: design and planning should be simple, transparent, and genuinely tailored to your project, not a generic template stretched to fit.
Most delays on a project don't come from bad design, they come from paperwork bouncing between people who aren't coordinated. An architect draws something the structural engineer then has to redo. A planning application gets submitted before building regulations are considered. Xpanza removes that back and forth by keeping design, structural work and planning under the same team from the first conversation.
We work directly with homeowners planning their own extension or conversion, and we also work behind the scenes for builders and developers who need drawings, calculations and planning documents produced quickly and correctly, without adding another supplier to manage.
Services we offer
Whatever stage your project is at, we cover it: design, drawings, planning, and structural calculations, all in-house.
01
Architectural Design
Full drawing sets for extensions, conversions and new builds, ready for council validation.
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02
Planning Permission
From pre-application advice to submission, we handle the whole application for you.
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03
Structural Engineering
Beam, foundation and load-bearing calculations for Building Control sign-off.
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04
Loft Conversions
Dormer, hip-to-gable or rooflight designs that add a bedroom, office or living space.
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05
Home Extensions
Single and double storey extensions designed around how you actually live.
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06
HMO Conversion
Room sizes, fire safety and licensing planned from day one.
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07
Party Wall Services
Notices and awards for work near a shared wall or boundary, under the 1996 Act.
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08
Survey and Inspection
Clear technical reports for cracking, movement and defects, UK-wide.
View serviceWhat makes Xpanza different
We combine architecture and engineering into one seamless workflow, so approvals come faster, changes cost less, and projects finish the way they were planned.
One Team, One Vision
Our architects and structural engineers work side by side, not as two separate suppliers.
Faster Approvals
Planning drawings and structural calculations are aligned from the start, so nothing holds up your application.
Cost Effective
Fewer design changes during construction means fewer surprises for you or your builder.
Building Compliance
Planning, building regulations and structural safety are handled together, properly, every time.
UK Wide Coverage
From first sketch to final sign off, we work with clients across the country, not just one region.
Clear Communication
No technical jargon, just straightforward updates so you always know where your project stands.
How Our Design Service Works
From first sketch to council approval one team carries your drawings, planning submission and structural sign-off. No separate architects or consultants to chase.
Free Consultation
Discuss your goals, budget and project. No pressure.
Site Survey & Check
We assess your site, options and any planning or structural constraints.
Concept Design
Review initial layouts and concept drawings with our design team.
Planning Submission
We prepare and submit your planning application, then track it.
Structural Drawings
Engineers prepare structural calculations and drawings for Building Control.
Find the right service for your project.
Explore planning, structural and survey services, then build an indicative fee summary from the Xpanza product list. Prices stay hidden until you choose to view your result.
What are you building?
Choose the closest match. Planning, structural and survey products are all available.
Which service do you need?
Choose planning, structural engineering, or a survey/report service.
Select scope
Choose the products you need. You’ll see their prices on the result step.
Your Estimated Project Cost
Indicative pricing from the Xpanza product list
This is an indicative estimate based on our standard rate card. Your exact price is confirmed in writing after a free consultation, once we've reviewed your property and scope.
A clearer view of your project.
Your choices come together here as a concise brief before you review the fees.
From first idea to an approved, build-ready package.
We keep the design and planning process clear, so you can take the next step with confidence your builder, structural engineer and Building Control all working from the same approved pack.
Discuss your project →Share your project
Tell us what you're building and send over any drawings, photos or ideas you already have.
We design & submit
Our team prepares your drawings and manages the planning application, start to finish.
Build with confidence
Receive a clear, approved package — ready for your builder and Building Control.
Frequently Asked Questions
Quick answers to the questions we get asked most about design, planning, and structural work.
It depends on the type and scale of work. Many extensions, loft conversions, and outbuildings may fall under permitted development rights, while larger projects need full planning permission. We assess this for you at the consultation stage.
Costs vary by project type and scale. A single storey extension typically costs less than a new build or multi-unit conversion. We provide a clear, fixed-fee quote before any work begins, covering design, planning, and structural drawings.
No, while we're based in Swansea, our design and planning services are available nationwide, with remote consultations and digital drawings for clients across the UK.
Yes. Structural calculations and drawings are carried out by certified structural engineers as part of our service, so you don't need to source a separate engineer.
Most councils aim to determine a standard householder application within 8 weeks, though this varies by local authority and project complexity.
"Architect" is a legally protected title in the UK, requiring ARB registration. Architectural designers can offer the same design and drafting expertise without that specific registration. We're happy to explain which is the right fit for your project during your consultation.
Let's get your project approved.
Tell us about your home and your ambitions. We reply to every enquiry within one working day.