What to expect from a design and build project in the West Midlands and Cotswolds

Design and build means one team is accountable for both the drawings and the delivery. Instead of appointing an architect, then tendering the work to a contractor who inherits somebody else's intent, a single practice carries the brief from first sketch through to the day you turn the key. AY Group works this way across London, the West Midlands, Warwickshire, Worcestershire, the Cotswolds and Shropshire, and the questions clients ask at the outset are almost always the same: how long, what order, and who is responsible when something moves.

Stage one: the brief and the site

Every project begins with a conversation about how the building will actually be used. Not the finish schedule, not the stone — how many people sit down to eat, where the light falls in the afternoon, whether the utility needs to absorb a family's worth of coats and boots. This is also where we walk the property. In Sutton Coldfield, Four Oaks, Little Aston and Solihull we see a great many substantial inter-war and post-war houses with generous plots and poor circulation; the opportunity is usually in reorganising the plan rather than extending it. In Broadway, Chipping Campden or Stow-on-the-Wold the constraint is different: stone, conservation area status, and often a listing that shapes what can be touched.

A measured survey follows, along with early advice on planning risk. It is cheaper to discover that a rear extension will be resisted at week two than at month four.

Stage two: concept design

Concept work translates the brief into a plan. We test two or three arrangements rather than defending a single idea, and we cost them in outline as we go so the conversation stays honest. Clients in Royal Leamington Spa, Warwick and Stratford-upon-Avon frequently arrive with a scheme drawn by someone else that was never priced; the design was pleasant and the budget was fictional. Costing at concept stage avoids the slow, demoralising process of value-engineering a project you have already fallen in love with.

Stage three: planning and technical design

Where consent is needed, we prepare and manage the application, including heritage statements for listed and conservation-area work in the Cotswolds and Worcestershire. In parallel, technical design resolves structure, services, drainage and the details that decide whether a finished room feels considered or approximate — shadow gaps, reveal depths, how a stone worktop meets a wall that is not quite square.

Realistic expectations on timing: a straightforward householder application is typically eight to ten weeks in England, longer where listed building consent runs alongside it. This is the single most variable element of any programme and it sits outside the contractor's control, which is why we start it early.

Stage four: procurement and programme

Before anything is demolished, we fix a programme and lock in the long-lead items. Bespoke joinery, natural stone, sanitaryware and specialist glazing are the usual culprits — a beautiful slab that arrives eleven weeks late will hold up a whole trade sequence. Procuring early is unglamorous and it is the difference between a site that flows and a site that stalls.

Stage five: construction

On site there is one lead who is accountable to you. Trades are sequenced rather than stacked, the property is protected, and you receive a regular report rather than having to chase. For occupied houses in Edgbaston, Barnt Green, Dorridge or Knowle we agree working hours and access with you and, where relevant, with neighbours before the first van arrives.

• A single point of contact from brief to handover
• Weekly progress and cost reporting, with variations agreed in writing
• Dust protection, secure storage and a clean site as standard
• Sequenced trades so the finish is not compromised by overlap

Stage six: finishes and handover

The last ten per cent takes disproportionate attention. Joinery is fitted and adjusted, stone is honed and sealed, decoration is completed in controlled conditions, and the snagging list is worked through before you see it rather than after. Handover includes commissioning of systems, operating instructions and warranty documentation.

What varies by region

In prime central London — Mayfair, Belgravia, Knightsbridge and Chelsea — the dominant factors are access, lift bookings, freeholder consent and party wall procedure. In the West Midlands the projects tend to be larger in footprint, with more scope for structural reconfiguration. Across the Cotswolds, Worcestershire and Shropshire, heritage fabric, local stone matching and conservation officer relationships set the pace. The process is the same; the risks are weighted differently, and the programme should reflect that from day one.

How long does it take?

It varies by project scope. As a general shape: design and planning commonly occupies the first three to six months, and construction runs from a few months for a focused refurbishment to considerably longer for whole-house work or a new build. Any practice quoting a fixed programme before a survey is guessing.

If you are considering a project in the West Midlands, Warwickshire, Worcestershire or the Cotswolds, a short conversation at brief stage is usually enough to tell you whether the ambition and the building agree with each other.

What it costs, in ranges

No practice can price a house it has not surveyed, but clients are entitled to a shape. On refurbishment work the spread is wide and driven by specification: a focused kitchen, living and utility reconfiguration in a substantial house sits at one end, and a whole-house strip-back with new services, bespoke joinery and natural stone throughout sits at the other, commonly several times the former. Extensions add the cost of new structure, foundations and envelope on top of the internal work they trigger, because a new room almost never stops at its own four walls. Two figures are worth holding in mind from the first meeting: a contingency of around ten per cent on refurbishment of a period property, and a professional and statutory fee allowance covering survey, structural design, planning and building control.

The reason for costing two or three concept arrangements rather than one is that the difference between them is often larger than any saving negotiated later. Value engineering after the design is fixed usually removes quality; testing options before it is fixed removes cost.

How decisions are recorded

Each stage closes with a written sign-off: the agreed plan, the specification behind it, and the cost attached to it. During construction, variations are priced and agreed in writing before they are carried out, and a weekly report sets out progress against programme, spend against budget and the decisions needed from you in the coming fortnight. This is the part clients notice most, because it removes the two things that make building work stressful — surprises and silence.

Related service: read more about how we run design and build, or how the same team handles a bespoke refurbishment where the building is being reworked rather than extended.

Frequently asked questions

How long does a design and build project take?

Design and planning commonly occupy the first three to six months, and construction runs from a few months for a focused refurbishment to considerably longer for whole-house work or a new build.

Who is responsible if something goes wrong?

Under design and build a single team holds both the design and the construction, so one accountable lead answers for the drawings, the programme and the finished work.

When is the budget fixed?

Outline costs are produced at concept stage against two or three arrangements, and the contract sum is fixed once technical design and procurement are complete.