fbpx

Custom Modular Systems

Custom Modular Buildings

Bespoke Custom Modular Buildings — Designed & Built in the UK

Fully bespoke modular buildings for commercial, education, healthcare, sports, and public sector clients. Designed to your brief, manufactured to ISO standards, installed UK-wide in 8–12 weeks.

8–12
Weeks Lead Time
90%
Factory Completed
50+
Years Experience
15yr
Structural Warranty
UK
Nationwide Delivery

A Smarter Way to Commission a Bespoke Building

Custom modular construction combines the precision of factory manufacturing with the design freedom of a traditional build. Therefore, you get a fully bespoke building — designed to your exact brief — delivered faster, at lower cost, and with far less on-site disruption than conventional methods.

Traditional Bespoke Construction

  • Programmes of 12–24 months or more
  • Weather delays and on-site waste
  • Multiple contractors to coordinate
  • Cost overruns and programme slippage
  • Permanent structures with no flexibility
  • Significant disruption to live operations
  • Quality inconsistency across trades

KC Custom Modular Solution

  • 8–12 week delivery from design sign-off
  • 90% factory-completed before delivery
  • Single-supplier, turnkey project management
  • Fixed price — no hidden costs or variations
  • Relocatable or permanent — your choice
  • Minimal on-site disruption, days not months
  • Consistent factory quality throughout

How Custom Modular Construction Works

Every KC custom modular building starts with your brief. Our design team works with you to develop a layout, specification, and finish that meets your exact operational requirements. Moreover, we handle planning support, building regulations compliance, and structural engineering — so you have a single point of accountability from concept to completion.

Once design is approved, fabrication begins in our controlled factory environment. Skilled engineers assemble anti-corrosive steel or timber frames to ISO 1090 and ISO 3834 standards. Furthermore, KINGSPAN QuadCore insulated panels are fitted to walls, roof, and floor before the modules leave the factory. Electrical first-fix, plumbing, internal linings, and floor finishes are all completed off-site.

Who Commissions Custom Modular Buildings?

Custom modular buildings serve a wide range of sectors across the UK. Education providers commission bespoke classrooms, SEN suites, and sports pavilions that meet DfE standards without disrupting the school term. Healthcare organisations specify custom GP surgeries, treatment rooms, and diagnostic facilities that comply with NHS technical memoranda.

Meanwhile, commercial businesses choose custom modular for offices, showrooms, reception buildings, and hospitality venues — such as padel club pro shops and golf simulator suites. Public sector and sports clients value the speed, compliance, and design quality that custom modular delivers. In every case, the result is a building that looks and performs like a permanent structure — but arrives in a fraction of the time.

Relocatable or Permanent — Built to Last Either Way

Unlike traditional construction, custom modular buildings can be designed for relocation from the outset. Consequently, when your requirements change — a new site, an expanded brief, or a change of use — your building moves with you. Structural warranties of 10–15 years and a design lifespan of 50–75 years mean your investment is protected for the long term, whether the building stays or moves.

Bespoke custom modular reception and pro shop building at a UK padel club sports facility
Custom modular reception and pro shop building — padel club, UK. Designed, manufactured, and installed by KC Modular Buildings.
Why Custom Modular?

Six Reasons Clients Choose KC Custom Modular Buildings

From fully bespoke design to flexible procurement, every aspect of our custom modular system is engineered to deliver buildings that perform like permanent — in a fraction of the time.

Fully Bespoke Design

Every custom modular building is designed from scratch to match your exact brief. Consequently, you choose the footprint, layout, internal partitions, finishes, and external cladding. Our in-house design team handles architectural drawings, structural engineering, and Building Regulations compliance — so you receive a turnkey solution from concept to completion.

Your Brief, Your Building
🏠

Energy-Efficient Envelope

KINGSPAN QuadCore insulated panels achieve wall U-values of 0.16–0.18 W/m²K and roof U-values of 0.11 W/m²K. Additionally, triple-glazed aluminium windows (U-value 0.7 W/m²K) and air-source heat pumps (SCOP 4.5) deliver a high-performance envelope that significantly exceeds Building Regulations Part L requirements.

Part L A-Rated
🏭

90% Factory Completed

Because 90% of the build happens in our controlled factory environment, on-site installation typically takes just days rather than months. As a result, disruption to your live operations is minimal. Furthermore, factory conditions eliminate weather delays and ensure consistent quality across every module — regardless of project size.

Days On Site, Not Months

Multi-Sector Compliance

Our custom modular buildings are designed to meet the specific regulatory requirements of your sector. For example, education buildings comply with DfE BB103 guidelines and Approved Document B fire safety. Healthcare facilities meet NHS Health Technical Memoranda. Moreover, all buildings are manufactured to ISO 9001, ISO 1090, and ISO 3834 standards.

Education · Healthcare · Commercial
💰

Buy, Hire, or Hire-to-Buy

Flexible procurement means you can purchase outright, hire for a fixed term, or hire-to-buy with payments offset against the purchase price. In addition, we offer asset finance through approved partners (3–7 year terms) and framework agreements for repeat clients. Therefore, cash flow never has to be a barrier to getting the building you need.

Flexible Procurement
💪

50–75 Year Design Life

Custom modular buildings from KC are engineered for the long term. Anti-corrosive steel frames, KINGSPAN QuadCore panels, and PVC PROTAN roof membranes deliver a design lifespan of 50–75 years. Additionally, structural warranties of 10–15 years, 5–10 years on panels and roof, and 5 years on windows and doors protect your investment well beyond handover.

15yr Structural Warranty
ISO 9001 ISO 1090 ISO 3834 ISO 14001 Constructionline SSIP Acclaim Part L Compliant Part B Fire Safety DDA Accessible
Build Configurations

Three Custom Modular Specifications to Suit Every Brief

Whether you need a cost-effective standard build, a fire-rated unit for education or healthcare, or a fully A-rated energy-efficient building, KC Modular Buildings has a configuration to match. Furthermore, every specification can be adapted — layouts, finishes, and M&E systems are all tailored to your exact requirements.

Standard

Standard Modular Build

Cost-effective, compliant, and ready to occupy in weeks.

From £25,000 per unit

Price varies by size, layout, and specification. Contact us for a fixed quote.


  • Steel frame, ISO 1090 certified
  • KINGSPAN PIR insulated panels (U-value 0.25–0.38 W/m²K)
  • Double-glazed aluminium windows
  • UK-standard electrical fit-out (RCD, LED lighting)
  • Panel heaters or electric heating
  • Natural ventilation, Part F compliant
  • Internal linings, vinyl flooring, painted finish
  • Building Regulations Parts B, F, M compliant
Best for: Site offices, welfare cabins, temporary classrooms, budget-conscious briefs
Get a Quote →
Premium

Part L A-Rated Build

Maximum energy performance for net-zero ready, future-proof buildings.

From £75,000 per unit

Price varies by size, layout, and specification. Contact us for a fixed quote.


  • Steel frame, ISO 1090 & ISO 3834 certified
  • KINGSPAN QuadCore 200mm panels (U-value 0.11 W/m²K)
  • REI60 fire resistance as standard
  • FD60 fire-rated doors throughout
  • Triple-glazed aluminium windows (U-value 0.7)
  • Air-source heat pump + MVHR system
  • PV-ready roof structure
  • EV charging point provision
  • SPC rigid core vinyl flooring (160mm PIR sub-floor)
  • Full DDA accessibility compliance
  • Building Regulations Part L A-rated EPC
Best for: Net-zero projects, NHS frameworks, local authority procurement, permanent buildings
Get a Quote →

Configuration Comparison at a Glance

Feature Standard REI60 Fire-Rated Part L A-Rated
Wall U-Value 0.25–0.38 W/m²K 0.16–0.18 W/m²K 0.11 W/m²K
Roof U-Value 0.25 W/m²K 0.11–0.16 W/m²K 0.11 W/m²K
Fire Rating Part B compliant REI60 structural REI60 structural
Windows Double-glazed aluminium Triple-glazed (U 0.7) Triple-glazed (U 0.7)
Heating Panel heaters / electric Air-to-air heat pump (SCOP 4.5) Air-source heat pump + MVHR
Ventilation Natural (Part F) MVHR heat recovery MVHR heat recovery
Fire Doors Standard doors FD30 / FD60 FD60 throughout
DDA Accessible On request Available Standard
PV-Ready Roof On request Standard
EV Charging Provision On request Standard
EPC Rating C–D typical B typical A-rated
Structural Warranty 10 years 10–15 years 15 years
Guide Price (per unit) From £25,000 From £45,000 From £75,000
Not sure which configuration suits your project? Our technical team can advise on the right specification for your sector, site conditions, and budget. Consequently, you get a building that meets every compliance requirement — without over-specifying or overspending.
Get Technical Advice →
Technical Specification

Custom Modular Building — Full Spec Snapshot

The table below summarises the core technical specification for KC custom modular buildings. Moreover, every element can be adapted to your brief — from dimensions and cladding to M&E systems and internal finishes. All data reflects our REI60 fire-rated and Part L A-rated configurations.

Parameter Specification
Dimensions & Layout
Standard Module Sizes 6m × 3m up to 12m × 6m per module (bespoke sizes available)
Multi-Module Footprints 15m² to 2,000m²+ (joined modules, single or multi-storey)
Storey Height Up to 3 storeys (stackable steel frame)
Internal Ceiling Height 2,400mm standard (2,700mm available)
Building Envelope
Frame Anti-corrosive steel, ISO 1090 & ISO 3834 certified
Wall Panels KINGSPAN QuadCore 120–200mm (U-value 0.11–0.18 W/m²K)
Roof Panels KINGSPAN QuadCore 170–200mm (U-value 0.11 W/m²K)
Floor Insulation PIR Thermano Deck 160mm (U-value 0.11–0.16 W/m²K)
Floor Finish SPC rigid core click vinyl (commercial grade)
Roof Membrane PVC PROTAN single-ply waterproof membrane
Windows Triple-glazed aluminium, U-value 0.7 W/m²K (PVC options available)
External Doors Aluminium, U-value 1.1 W/m²K (FD30/FD60 fire-rated available)
Internal Walls QuadCore 100mm (U-value 0.22 W/m²K) + Rockwool 45mm acoustic
Fire Rating EI/REI/EW classifications; REI60 structural fire resistance available
Mechanical & Electrical
Electrical UK 230V, RCD consumer unit, IP65 LED lighting, emergency lighting, CCTV provision
Heating Air-to-air heat pump (SCOP 4.5) or panel heaters (spec dependent)
Ventilation MVHR mechanical ventilation with heat recovery (natural ventilation on Standard spec)
Plumbing GEBERIT systems (25-year warranty), FIBO hygiene wall panels, 80–120L water heater
Fire Safety FD30/FD60 fire doors, fire alarm integration, emergency lighting, Part B compliant
Compliance & Certification
Building Regulations Part L (energy), Part B (fire), Part M (accessibility), Part F (ventilation)
Structural Standards ISO 1090, ISO 3834, ISO 9001
Environmental ISO 14001 certified manufacturing
Health & Safety SSIP Acclaim, Constructionline Bronze Member
Accessibility DDA-compliant layouts, Part M accessible entrances, ramps, and WC facilities
Programme & Delivery
Design & Approval 2–4 weeks (drawings, structural calcs, Building Regs submission)
Manufacture 6–8 weeks (90% factory completed)
Delivery UK mainland, HIAB or crane placement (islands and Europe by quotation)
On-Site Installation 1–5 days typical (service connections, snagging, handover)
Total Programme 8–12 weeks from design sign-off to handover
Warranty & Lifespan
Structural Warranty 10–15 years (steel/timber frame)
Panels & Roof 5–10 years
Windows & Doors 5 years
Workmanship 12–24 months (internal fit-out and installation)
Design Lifespan 50–75 years

Note: All specifications are indicative and may vary depending on project requirements, site conditions, and chosen configuration. Consequently, we recommend requesting a detailed technical data sheet for your specific brief. Prices exclude VAT, delivery, installation, and site preparation unless stated otherwise.

Need the Full Technical Data Sheet?

ISO 9001 ISO 1090 ISO 3834 ISO 14001 ISO 27001 Constructionline SSIP Acclaim Part L Part B Part M Part F DDA Accessible
Our Process

From Brief to Building in 8–12 Weeks

Our streamlined six-stage process takes your project from initial enquiry to completed building in as little as 8 weeks. Furthermore, a dedicated project manager oversees every stage — so you always know exactly where your building is and when it will be ready.

1
Week 1

Initial Enquiry & Site Assessment

Your project begins with a detailed conversation about your brief, budget, and programme. Consequently, our team can identify the right configuration, size, and specification from the outset. We also assess site access, ground conditions, and any planning or permitted development considerations.

  • Brief and budget review
  • Site access assessment
  • Ground condition review
  • Planning advice
  • Configuration recommendation
2
Week 1–2

Design & Technical Proposal

Our design team produces detailed architectural drawings, floor plans, and a full technical specification. Moreover, we include structural calculations, M&E schematics, and a fixed-price quotation. Therefore, you have everything needed to make an informed decision before committing to the project.

  • Architectural drawings
  • Floor plans and elevations
  • Structural calculations
  • M&E schematics
  • Fixed-price quotation
3
Week 2–4

Approvals & Contract Sign-Off

Once you approve the design and quotation, we submit Building Regulations applications and any required planning documentation on your behalf. Additionally, we finalise the contract, agree the programme, and confirm the 40% deposit to release the manufacturing slot. As a result, your project moves forward without delay.

  • Building Regs submission
  • Planning documentation
  • Contract finalisation
  • Programme confirmation
  • Manufacturing slot secured
4
Week 4–10

Factory Manufacture

Your building is manufactured in our controlled factory environment to ISO 1090 and ISO 3834 standards. Skilled fabricators assemble the steel frame, fit KINGSPAN QuadCore insulated panels, and complete electrical first-fix, plumbing rough-in, internal linings, and floor finishes. Furthermore, quality inspections are carried out at every stage before the modules leave the factory.

  • Steel frame fabrication
  • Panel installation
  • Electrical first-fix
  • Plumbing rough-in
  • Internal linings and flooring
  • Factory QA inspection
5
Week 10–11

Delivery & Installation

Completed modules are transported to site by specialist HIAB or crane vehicle. On-site installation typically takes one to five days, depending on the number of modules and complexity of service connections. Meanwhile, your project manager coordinates all trades to ensure a smooth, disruption-free installation on your live site.

  • HIAB or crane delivery
  • Module positioning
  • Service connections
  • External finishing
  • Site manager on-site
6
Week 11–12

Snagging, Handover & Aftercare

Before handover, our team carries out a full snagging inspection to ensure every detail meets our quality standard. Subsequently, we provide a complete handover pack including as-built drawings, O&M manuals, warranty certificates, and Building Regulations completion certificate. Therefore, your building is ready to occupy from day one.

  • Full snagging inspection
  • As-built drawings
  • O&M manuals
  • Warranty certificates
  • Building Regs completion
  • Aftercare support
8–12
Weeks Total Programme
1–5
Days On Site
90%
Factory Completed
15yr
Structural Warranty
Case Studies

Custom Modular Buildings Delivered Across the UK

From bespoke sports facilities to healthcare clinics and commercial offices, our custom modular buildings are performing across every sector. Furthermore, each project demonstrates the speed, quality, and compliance that KC Modular Buildings delivers as standard.

Custom modular reception and pro shop building at a UK padel club sports facility
Sports & Leisure Bespoke Design

Padel Club Reception & Pro Shop

A fully bespoke modular reception, pro shop, and changing facility for a new UK padel club. The building was designed to match the club's brand identity, with custom cladding, full-height glazing, and a welcoming open-plan layout. Consequently, the club was able to open on schedule without construction delays.

  • Bespoke layout with reception, shop, and changing rooms
  • Custom external cladding and full-height glazing
  • REI60 fire-rated specification
  • Delivered and installed in 10 weeks
“KC delivered exactly what we needed — a building that looks permanent but arrived in weeks. Our members love it.”
— Club Director, UK Padel Facility
Custom modular GP surgery building installed at a healthcare site in Exeter, UK
Healthcare Part L A-Rated

GP Surgery & Treatment Rooms — Exeter

A custom-designed modular GP surgery with consultation rooms, treatment areas, and accessible patient facilities. The building was manufactured to NHS Health Technical Memoranda standards and achieved a Part L A-rated EPC. Moreover, installation on the live NHS site was completed in just three days.

  • NHS-compliant consultation and treatment rooms
  • Part L A-rated energy performance
  • GEBERIT sanitary systems with FIBO hygiene panels
  • Full DDA accessibility throughout
“The quality of the finished building exceeded our expectations. Patients and staff have commented on how modern and comfortable it feels.”
— Practice Manager, Exeter GP Surgery
Interior of a custom modular office building with modern fit-out and LED lighting
Commercial REI60 Fire-Rated

Bespoke Office Building — Multi-Module

A multi-module custom office building for a growing commercial client who needed additional workspace without the disruption of traditional construction. The building features open-plan offices, meeting rooms, a kitchenette, and accessible WC facilities. Additionally, the REI60 fire-rated specification ensured full compliance with the client’s insurance requirements.

  • Multi-module open-plan office layout
  • Meeting rooms, kitchenette, and accessible WC
  • REI60 fire-rated with FD30 doors
  • Air-to-air heat pump and MVHR ventilation
“We went from initial enquiry to moving in within 9 weeks. The building looks and feels like a permanent office — our team is delighted.”
— Operations Director, Commercial Client
500+
Buildings Delivered
98%
On-Time Delivery
12
Sectors Served
UK
Nationwide Coverage
Education Healthcare Commercial Construction Sports & Leisure Public Sector Hospitality Residential
Frequently Asked Questions

Your ISO Frame Questions Answered

We have compiled answers to the questions our clients ask most frequently about ISO frame modular buildings. Furthermore, if you cannot find the answer you need below, our technical team is available to help directly.


  • Programme Overview

    The total programme from initial enquiry to completed building is typically 8–12 weeks. Consequently, ISO frame modular buildings are significantly faster than traditional construction, which commonly takes 6–18 months for an equivalent building.

    On-site installation takes just 1–5 days, depending on the number of modules and complexity of service connections. Furthermore, because 90% of the building is completed in our factory, site disruption is minimal.

    • Design and approvals: 1–4 weeks
    • Factory manufacture: 4–8 weeks
    • Delivery and installation: 1–5 days on site
    • Snagging and handover: 1–3 days

  • Standard Dimensions

    Our ISO frame modular buildings are available in standard widths of 3m, 4m, and 6m, with lengths from 6m to 12m. Moreover, modules can be combined side by side or end to end to create larger floor plates up to 2,000m² and beyond.

    • Standard widths: 3m, 4m, 6m
    • Standard lengths: 6m, 9m, 12m
    • Internal height: 2.5m clear
    • Stackable to 3 storeys
    • Bespoke dimensions available on request

  • Compliance Standards

    Yes. All KC Modular Buildings ISO frame buildings are designed and manufactured to comply with UK Building Regulations as standard. Additionally, we manage the Building Regulations application process on your behalf as part of our full turnkey service.

    • Part L — Energy efficiency (A-rated available)
    • Part B — Fire safety (REI60 specification available)
    • Part M — Accessibility and DDA compliance
    • Part F — Ventilation (MVHR standard)
    • ISO 1090 and ISO 3834 structural certification

  • Specification Comparison

    We offer three core specifications to suit different project requirements and budgets. Therefore, you can select the right level of performance without paying for features you do not need.

    • Standard: KINGSPAN QuadCore panels, U-value 0.25 W/m²K, PVC windows, panel heaters — ideal for storage, welfare, and short-term use
    • REI60 Fire-Rated: 60-minute fire resistance, FD60 doors, fire-rated glazing — required for multi-storey, healthcare, and education
    • Part L A-Rated: U-value 0.16 W/m²K, triple-glazed windows, air-to-air heat pump, MVHR — lowest running costs, permanent use

  • Multi-Storey Capability

    Yes. Our ISO frame system is engineered to stack up to three storeys without additional groundworks or structural reinforcement. Moreover, multi-storey configurations are ideal for maximising floor space on constrained sites.

    • Stackable to 3 storeys as standard
    • REI60 fire-rated specification required for multi-storey
    • Internal staircase and lift options available
    • Balcony and external staircase configurations available
    • Structural calculations provided for each configuration

  • Warranty Coverage

    We provide one of the most comprehensive warranty packages in the UK modular building industry. Consequently, you can commission your building with confidence, knowing that every component is covered.

    • 10–15 years structural warranty (steel frame)
    • 5–10 years panels and roof membrane
    • 5 years windows and doors
    • 12–24 months internal workmanship and installation
    • Extended and public-sector warranties available on request

  • Flexible Procurement

    We offer three procurement routes to suit your budget and project timeline. Therefore, whether you need a permanent building or a temporary solution, we can structure the right deal for your organisation.

    • Capital Purchase: 40% deposit, 55% before delivery, 5% within 14 days of handover
    • Hire: Flexible rental terms from 12 months, ideal for temporary or seasonal requirements
    • Hire-to-Buy: Rental payments offset against purchase price, converting to ownership over time
    • Asset Finance: 3–7 year lease via our finance partners, preserving your capital

  • Relocatability

    Yes. ISO frame modular buildings are inherently relocatable because each module is a self-contained, transportable unit. As a result, you can move your building to a new site if your requirements change, protecting your long-term investment.

    • Modules lifted by HIAB or crane for relocation
    • Service disconnections and reconnections managed by our team
    • No structural degradation during relocation
    • Ideal for phased developments and temporary planning consents

  • Sectors Served

    We supply ISO frame modular buildings to clients across every major sector in the UK. Additionally, our experience in regulated environments such as healthcare and education means we understand the compliance requirements that matter most to your project.

    • Education — classrooms, SEN units, dining halls
    • Healthcare — GP surgeries, clinics, treatment rooms
    • Commercial — offices, showrooms, retail units
    • Construction — site offices, welfare units, drying rooms
    • Sports & Leisure — pavilions, changing rooms, pro shops
    • Public Sector — council offices, community buildings
    • Hospitality — kitchens, cafes, accommodation
    • Residential — annexes, lodges, holiday accommodation

  • UK-Wide Delivery

    Yes. We deliver and install ISO frame modular buildings across the entire UK mainland, including England, Wales, and Scotland. Furthermore, we can quote for delivery to UK islands, Northern Ireland, and selective mainland Europe locations for larger or bespoke projects.

    • Full delivery and installation: UK mainland
    • Extended coverage: UK islands and Northern Ireland by quotation
    • Europe: selective locations for large projects
    • Site access and logistics assessed at enquiry stage

Still Have Questions?

Our technical team is available to discuss your project requirements in detail.