Do the stairs have to be inside?

No. External stairs keep the internal floor area free, which is often worth more than the weather protection.

Can we add a first floor later?

It depends on the base and the original arrangement — it is reviewed rather than assumed.

Can there be a terrace on the first floor?

Yes, over any exposed ground-floor module, with balustrade to the open edges.

Two-Storey Modular Buildings

Stacking modules doubles the floor area without widening the footprint. It is the usual answer on a tight yard, a narrow plot or anywhere the ground-floor area is already spoken for.

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Two-Storey Modular Buildings — Adacon modular building

What stacking changes

The module itself doesn't change — the base, the structure and the stair arrangement do. Every two-storey project is reviewed for foundations and structure, and services are stacked vertically wherever possible.

Twice the floor area on the same footprint
Internal, external or covered external stairs
Roof terrace formed over any exposed ground-floor module
Vertically aligned services to simplify connections
Foundations and structure reviewed per project
Ground floor can stay open-plan while the first floor is partitioned

Typical arrangements

4 modules over 2 storeys

approx. 52 m²

Two modules per floor — a common office or home arrangement.

6 modules over 2 storeys

approx. 78 m²

Three per floor, with a terrace over an exposed ground module.

8 modules over 2 storeys

approx. 104 m²

A full two-storey building with stairs and first-floor facilities.

Two-Storey Buildings — key facts

Product: P600 modular building
Module dimensions: 5900mm × 2200mm (5.9m × 2.2m)
Module footprint: approx. 12.98 m²
Price per module: £10,750 + VAT (£12,900 inc. VAT)
Configuration: Single module or multiple connected modules
Storeys: Up to two storeys, subject to final project design
Delivery: UK mainland and Northern Ireland, included in the price

The Adacon P600 modular building measures 5.9m × 2.2m (5900mm × 2200mm) with a module footprint of approx. 12.98 m², and costs £10,750 + VAT per module. Each module can include a kitchen, toilet, shower, internal partitions, windows, doors, lighting, sockets and a consumer unit, and modules can be joined side by side or stacked to two storeys.

What's available

Per-wall cladding style and colourFixed window and door configurations per wallInsulated walls, floor and roofInternal partitionsKitchen, WC and shower optionsTerrace, decking and balustradeInternal or external stairsRoof terrace and balustrade

Two-Storey Buildings example 1 — Adacon modular building

Two-Storey Buildings — common questions

Buildings that commonly use this

Modular Offices

Modular office buildings from a single room to multi-module, two-storey layouts. Fitted out, insulated and delivered UK-wide. Configure yours online.

Site Offices

Robust modular site offices for construction projects — desks, meeting space, heating, power and optional welfare. Configure your site office online.

Modular Clubhouses

Modular clubhouses for football, rugby, cricket, tennis and padel clubs — changing rooms, bar, kitchen, WCs and social space in one linked building.

Related design options

Roof Terraces Balconies Linked & Multi-Module Buildings

All design options

Homes with this design

Two-Storey Modular Homes Modular Bungalows Granny Annexes Modular Holiday Homes

All modular homes

Useful guides

Can Modular Buildings Be Two Storeys?

Yes — P600 modules can be stacked to create two-storey modular offices, welfare blocks and clubhouses, with an internal or external staircase.

Do Modular Buildings Need Foundations?

Modular buildings need a level, load-bearing base rather than traditional deep foundations. Learn what base types suit garden rooms, site offices and two-storey builds.

How Much Do Modular Buildings Cost?

An Adacon P600 module costs £10,750 + VAT fully fitted, with UK mainland and NI delivery included. See what drives the price of a modular building.

All guides