DESIGN. PLAN. MANAGE. BUILD.
From first sketch to final sign-off — design, planning, technical drawings, 3D visualisation, building control, and project management, all handled in-house by one team.
One studio. Nine disciplines.
Most projects fail because they're managed across too many consultants. We built Oneoff Design to fix that — bringing every discipline in-house so your project moves faster, costs less, and delivers more.
Whether it's a rear extension, side return, wrap-around, or over-structure addition, we design extensions that feel like they were always part of the building. We handle everything from initial concept through to planning approval and building control sign-off.
- Feasibility study and concept design
- Full planning drawings and application
- Building regulations drawings
- Structural coordination
- Interior design integration
New build projects demand precision at every stage. We take projects from site appraisal and concept design through planning, building control, and construction oversight — ensuring the finished building matches the vision.
- Site appraisal and feasibility
- Concept and scheme design
- Full planning application
- Building regulations package
- Construction stage oversight
A well-designed loft conversion adds significant value and living space. We design dormer, hip-to-gable, and mansard conversions to maximise headroom, light, and usability — and manage the full planning and building control process.
- Loft survey and feasibility
- Dormer, hip-to-gable, and mansard design
- Planning drawings and application
- Building regulations drawings
- Party wall coordination
Our technical drawing service produces fully coordinated CAD packages — floor plans, elevations, sections, and details — to the standard required for planning, building control, and construction. We also produce measured surveys and as-built drawings.
- Measured surveys and as-built drawings
- Planning drawings (floor plans, elevations, sections)
- Building regulations drawings
- Construction detail drawings
- Coordination with structural engineers
Photorealistic 3D renders and walkthroughs that bring your project to life before a single brick is laid. Used for planning applications, client presentations, marketing, and design development — our visualisations are produced to the highest standard.
- Photorealistic exterior renders
- Interior renders and material studies
- Animated walkthroughs
- Planning application visuals
- Marketing and sales imagery
Planning can make or break a project. Our in-house planning expertise means we design with policy in mind from day one — maximising what's achievable and preparing applications that give your project the best possible chance of approval.
- Pre-application advice and strategy
- Full planning application preparation
- Householder and full planning applications
- Listed building and conservation area applications
- Appeal support
Building regulations compliance is non-negotiable. We prepare full building control packages — structural, thermal, fire, and drainage — and liaise with approved inspectors or local authority building control throughout the construction process.
- Building regulations drawings and specifications
- Structural coordination
- Thermal performance calculations
- Fire strategy and drainage design
- Approved inspector liaison
Converting a property to a House in Multiple Occupation requires careful design, planning, and compliance with strict fire safety regulations. We manage the full process — from layout design and planning applications through to fire risk assessments and building control sign-off — ensuring your HMO is legally compliant and ready to let.
- HMO layout design and feasibility
- Planning application for change of use
- Building regulations drawings
- Fire risk assessment and fire strategy
- Means of escape and compartmentation design
From contractor procurement to final sign-off, our project management service keeps your build on track. We act as your eyes and ears on site — managing contractors, monitoring progress, and resolving issues before they become problems.
- Contractor procurement and tendering
- Contract administration
- Site inspection and progress monitoring
- Cost management and variation control
- Practical completion and defects management
One process. Every time.
Design
We start with your brief and the site. We explore options, test ideas, and develop a design that works — spatially, technically, and within planning policy.
Plan
We prepare all the drawings, documents, and applications needed to get your project approved and ready to build. Planning, building control, and technical coordination — all in-house.
Manage
We manage the build from contractor procurement to practical completion. Regular site visits, clear reporting, and a single point of contact throughout.
Not sure which services you need?
Tell us about your project and we'll recommend the right package. Initial consultation is always free.