Full beam on show in Feilden Fowles' event space

In many a small once-rich village the massiveness of a tithe barn stands out as symbol of communal hope and plenty. There are few such symbols today: rebuilt churches have front doors squeezed in beside the flats that funded them, flimsy-looking new schools are secured by high fencing.

But on a tight sliver of site, in hailing distance of the bright blue of Grimshaw’s Eurostar terminal at London’s Waterloo Station, is a remarkable symbol of generosity and gathering in. Here the enormous doors are thrown open to the excluded children of the city to experience the pastoral pleasures of feeding animals and growing your own food. As you emerge from the darkness of the grimy railway arches you come across a play on wood, spinning out into a hexagon on the outsized gable end.

This energetic wooden edifice doesn’t suggest a city farm. That form, drip-fed by small grants and busy volunteers, is pretty established: animal pens, concrete and straw gradually upgrading to sheds with maybe a Portakabin office and loos and some polytunnels. Perhaps a wholesome café set away from the mucking-out.

Waterloo City Farm is more invested in its place. Here the half-acre leased from Guy’s and St Thomas’ Charity is likely one day to be part of a redevelopment of St Thomas’ Hospital. But with the completion of the barn it has the appearance of more committed neighbour than that temporary permission would suggest.

This is the city follow-up base for Jamie’s Farm, which takes children in danger of exclusion from their urban school to the countryside for a week, for farming, family and therapy at farms around the country, or gives them a six-week version of the same in the city. It is also the base for architecture practice Feilden Fowles, whose co-founder Fergus Feilden is brother to the eponymous Jamie of Jamie’s Farm. It is Feilden Fowles’ pro bono design work that led to the neatly planned animal pens and to the elegant studio offices it leases, offering desk space for the charity administration looking onto a delicate Dan Pearson-designed garden. And now to the barn.

The way the barn sits across the whole site at one end gives it an enormous presence – while transforming the rest of the linear site into a more comfortably compact shape. The larch and corrugated glass-fibre form reaches up 6.1m and the galvanised doors roll open to a structure that quite distracts you from the straw bales: three-bayed, with tall Douglas fir columns creating a nave of diamond trusses which are beautifully awkward. The full-length ‘transepts’ of the outer bays have angled members that impinge just enough on head height to feel like there should be long tables under them at which to gather and sit. Slots at skirting height and between the cap of the roof and the lower plane keep air moving, letting in just the occasional gust of weather.

Early ideas for a steel portal frame were scuppered by the soft London clay beneath. The raft of concrete foundation needed the load spread fairly evenly across it, thus the bays. Instead of time-consuming mortice and tenon joints or individually drilling each screw hole for the joints Feilden Fowles has used ply gussets, each plate CNC-drilled (a total of 1800 connections) if the meanwhile use should end, this also makes the structure more easily demountable. From the inside the huge doors are made more human with a condensed, smaller-scale version of the pattern on the outside.

In the corner is a galvanised crinkly tin enclosure, a watertight classroom. There is not attempt to seal the rest of the enclosure, it is an airy space. And light too thanks to the daylight filtering in through the glass fibre. Grant funding was tied to construction packages which meant that this sat first as a slab for some time, then as roof and structure before being enclosed over the last year, with the practice putting £20,000 into the build.

Despite the simplicity of the barn – no loos, only one window – the thought that went into it at all stages is palpable. And, as well as being covered learning space, this gives the opportunity to bring people together who might contribute by hiring the space to the charities running the farm.

Animal security and the importance of creating a sanctuary in this intense urban environment means that most of the time the barn looks inwards towards its farm. But, like a tithe barn, it can be opened right up on either side – and if what is brought is not grain, then it is at least good things in another form.

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IN NUMBERS

Barn area: 290m²

Barn construction value: £143,000

Barn cost: £493/m²

Total farm area (barn, studio, annexe, pens): 1,630m²

Farm construction value: £343,000

Farm cost: £210/m²