Case study  /  Earlswood

Green Gate Barns,
two homes, built.

A redundant steel-framed farm barn converted into a five-bedroom and a three-bedroom house, with prior approval granted in forty-three days.

Visualisation of the converted barn at Green Gate Barns, Earlswood: a long single gabled form clad in dark burnt-cedar vertical boards with two golden-oak entrance recesses, a standing-seam aluminium roof with rooflights set into the slope, black framed windows and doors, a clipped hedge and gravel drive in front and open countryside beyond

Green Gate Barns, from the drive. A visualisation of the scheme rather than a photograph, though the barn has been converted and both homes are complete.

The facts

Class Q barn conversion architects, Solihull.

A large detached steel-framed agricultural building on the rural edge of Earlswood, empty for years after an earlier proposal for the site did not come forward.

The project

Two homes from one steel shed.

43days from registration to prior approval
Location
Green Gate Barns, on the rural edge of Earlswood, Solihull
Client
A private client, anonymised by agreement
Our scope
RIBA Stage 0 to 4, and agent on the prior notification
Status
Converted, completed and occupied

Prior approval PL/2022/01375/PNCUDW, Solihull Metropolitan Borough Council, granted 18 August 2022, inside the 56-day statutory period. Materials condition discharged 9 March 2023, PL/2023/00437/DIS.

The brief

A barn that had stood empty.

The building was a large detached steel-framed barn, light trusses over corrugated sheet, with one long side open to the weather. It had held livestock and machinery, and then nothing at all for years.

The ask was two genuine houses out of it, and a planning route that would actually succeed rather than one that merely looked plausible.

Building
Steel portal frame and corrugated sheet, one elevation open
Route
Class Q prior notification, not a full planning application
Condition
Frame broadly sound, the column bases corroded at the foot
The accommodation

What two homes measure.

Homes
2
Plot 01
5 bed, 260.9 sqm
Plot 02
3 bed, 137.7 sqm
Combined GIA
398.6 sqm / 4,290 sqft
Extension
None, nothing beyond the original shell
Statutory window
56 days
Taken
43 days

Gross internal, approximate, per our own accommodation schedule. Each home has its own entrance, on opposite elevations of the same building.

The timeline

Forty-three days in the middle.

Timeline for Green Gate Barns, Earlswood, drawn to scale in time: an earlier proposal for the site stalls in 2021; the Class Q prior notification is registered on 6 July 2022; prior approval is granted on 18 August 2022; the materials condition is discharged in March 2023; and the two homes are built and complete

Spaced by time, not by event, so the short hop in the middle reads as short. The two solid markers are the notification and the approval, six weeks apart.

The scheme

One barn form, two front doors.

The frame kept, the profile kept, the openings held back to what the rules allow, and the whole difficulty pushed into the plan and the section rather than the elevations.

Before

Corrugated sheet and rusting trusses.

This is what the building was: light steel trusses on a portal frame, corrugated sheet on three sides, a floor of hardstanding and years of nothing. Everything the finished homes are is inside this volume, because the rules do not allow anything outside it.

The barn as found. A photograph, not a visualisation: this is the only image on the page of the building as it actually stood.

The plot

The curtilage, and one footprint.

Class Q converts a building, not a site, so the drawing that matters is the one showing that nothing moved. The two homes sit inside the single barn footprint, in a residential curtilage taken off the existing access, with the wider plot left open beyond it.

Our site plan, drawing 110A. The footprint is the one the barn already had; the curtilage is drawn tight around it. North to the top.

Front elevation

Two doors, opposite ends.

The two entrances sit on opposite elevations, so each home arrives at its own front door and neither looks into the other. The openings are deliberately sparse and the canopies give cover without projecting, which is the difference between a conversion the rules permit and one they do not.

The entrance elevation, drawing 300. Vertical boarding in two tones under an aluminium roof, with the rainwater goods run behind the cladding.

Section A-A

A floor inserted, light dropped in.

New wall openings are limited, so the daylight has to come from above. The section shows the retained frame, the new floor slotted into it, the insulated build-up that turns an open shed into a house, and the roof openings that light the middle of a plan too deep to light from its edges.

Section A-A, drawing 300J. The existing slab is retained and reused; the levels down the left edge are what the build was set out from.

The hard part

Two homes, and no extra room.

The volume is fixed before the plan starts.

A five-bedroom house and a three-bedroom house had to come out of a shed built for machinery, without a metre added anywhere. Every square metre one home gains, the other loses, and the elevations cannot help.

Discuss your building
Visualisation of the converted barn at Green Gate Barns from the garden side: dark vertical timber boarding under a standing-seam roof, full-height glazing and sliding doors opening onto a stone terrace and lawn, with countryside and mature trees beyond

A visualisation of the garden side, not a photograph. The two homes divide a single volume, so the split between them is the design decision the whole scheme turns on.

The full story

The building was a large detached steel-framed agricultural barn on the rural edge of Earlswood: light trusses over a portal frame, corrugated sheet cladding, one long side open to the weather, last used for livestock and machinery. An earlier proposal for the site had not come forward, and the barn had stood empty since. Our client wanted two well-built homes out of it, and, more to the point, a planning route that would actually get there.

We judged that route to be Class Q, the permitted-development right that allows an agricultural building to become dwellings under Schedule 2, Part 3 of the General Permitted Development Order. It offers a faster and more certain decision than a full application, and it is not a soft option. The conversion has to sit inside the existing structure. Nothing may extend beyond the original shell. Only the openings reasonably necessary to form a dwelling are allowed, and the result still has to read as the agricultural building it was. On top of that the council tests the building's planning history, the access, flood risk and contamination before it will grant anything.

All of which means the route turns on evidence rather than on argument. We assembled what Solihull would need and submitted it as one case: confirmation that the barn had genuinely been in agricultural use, a flood risk assessment, a drainage strategy, a contamination desk study and a structural assessment, alongside the drawings. The first submission came back invalid on a procedural point. We corrected it and resubmitted without touching the design, which is the difference between losing a fortnight and losing a scheme.

The design worked with the barn rather than against it. We kept the steel frame and the simple gabled form and arranged both homes inside the single shell. The larger house, five bedrooms, is organised around a double-height living space with openings cut into the roof plane, because a plan this deep cannot be lit from its edges and the rules will not give you more edges. The three-bedroom house sits alongside it. The two front doors are on opposite elevations, so each home has its own arrival and its own privacy, and each entrance is sheltered by a canopy that gives cover without projecting past the footprint.

Solihull granted prior approval on 18 August 2022, forty-three days after registration and comfortably inside the fifty-six-day window. A Class Q decision is binary in a way a planning application is not: the council either determines that prior approval is required and grants it, or it does not, and there is very little in between to negotiate. Getting it first time asked is the whole value of preparing the evidence properly.

Then we delivered it. We produced the full technical design for building regulations, coordinated the structural engineer, the mechanical and electrical design and the fire strategy, and took the scheme through building control. The existing slab was retained and reused, the corroded column bases were made good, and the frame was repaired rather than replaced. The materials condition was discharged in March 2023, and a non-material amendment later that year resolved the roof and the rooflights as the build progressed.

Externally the building still reads as a barn: vertical boarding in two tones, dark burnt cedar with a golden-oak shadow line, under a powder-coated aluminium roof, black aluminium windows and doors, and the rainwater goods hidden behind the cladding. The openings are restrained on purpose. Two homes now stand where a derelict barn did, and from the lane it is not obvious that anything has been added at all.

What we did

The route, then the whole build.

One practice from the first conversation to two finished homes: the planning strategy, the evidence behind it, the technical design, the conditions and the construction.

The application

Prior approval, first time asked.

Route
Class Q prior notification, GPDO 2015, Schedule 2, Part 3
Evidence
Agricultural use, flood risk, drainage, contamination, structure
Registered
6 July 2022, after a first submission was returned on a procedural point
Decided
Granted 18 August 2022, 43 days later

Class Q rewards preparation and punishes optimism. There is very little to negotiate once it is in.

The building

Built, not just consented.

Technical design
The full building regulations package, RIBA Stage 4
Coordinated
The structural engineer, the services design and the fire strategy
Structure
Frame retained and repaired, corroded column bases made good
Conditions
Materials discharged March 2023, a non-material amendment after it

A consent that never gets built proves nothing. This one is finished and lived in.

The continuity

One practice, start to finish.

Stages
RIBA 0 to 4, and on into construction
Agent
We were the agent on the prior notification, not just the designer
Accountable
A director from the first conversation to the finished homes
Not ours
The structural survey and the visualisations were by others

The practice that picks the route is the one that has to live with it. That concentrates the judgement.

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