House Extensions
Single and double-storey, rear, side and wraparound extensions — including kitchen and garage extensions. The most common way to get the space you need without moving.
House detailsExtensions, loft conversions and structural work across Herefordshire, Monmouthshire and Gloucestershire
Around 20 years of construction experience behind every project. Free site visit, a written itemised quotation, a written contract and staged payments — so you know exactly what you are buying before anyone lifts a tool.
Or call 01432 291045 (Hereford) · 01600 228805 (Monmouth)
20 years' construction experienceBehind every project we take on
Written quotes and contractsScope and stages agreed up front
Fully insuredIncluding public liability
Free site visitNo cost, no obligation
Two decades on site
Experience where it actually counts
Behind Complete Builders sits roughly two decades of hands-on construction experience — extensions, conversions, structural alterations and renovation work on the kind of properties you find across Herefordshire, Monmouthshire and Gloucestershire.
That matters more than it sounds. Older stone and brick homes, timber-framed cottages, converted farm buildings and 1930s semis all behave differently once you start opening them up. Knowing what you're likely to find behind a wall before you knock it down is the difference between a project that runs to programme and one that stalls.
What you get in writing
Free site visit and written quotation
Detailed written contract
Staged payments, agreed up front
Workmanship guarantee
Fully insured, including public liability
Planning permission assistance
Building Regulations assistance
Architect and structural engineer coordination
One point of contact from start to finish
Clear programme with regular updates
What we build
Residential building work, start to finish
Extensions and conversions are what we do most of. Every job is run the same way: one point of contact, a written scope, and a programme you can hold us to.
Loft Conversions
Dormer, hip-to-gable, Velux and L-shaped conversions. Usually the cheapest square metre you can add to a house, and often possible under permitted development.
Loft details
Garage Conversions
Turning an under-used garage into a proper room — office, snug, utility or bedroom — with the insulation, floor build-up and damp detailing done properly.
Garage details
Renovations & Structural Alterations
Removing walls, installing steels, opening up ground floors, reconfiguring layouts and full property renovations, including older Herefordshire, Monmouthshire and Gloucestershire homes.
Renovations detailsGarden Rooms & Annexes
Insulated garden offices, studios and self-contained annexes for family who need their own space, built to be used all year round.
Garden detailsWhere projects go wrong
Most builder horror stories start the same way
A vague quote. No contract. Money paid up front. Then the price creeps, the dates slip, and nobody will give you a straight answer.
Every one of those problems is preventable, and none of the fixes are complicated. They just have to be agreed before the work starts rather than argued about halfway through.
How we deal with it
The price. You get an itemised written quotation setting out what is and isn't included. If something genuinely changes — ground conditions, a structural surprise, a change you ask for — it's priced and agreed in writing before we carry it out.
The money. Staged payments tied to completed stages of work. You never pay for work that hasn't happened.
The dates. A programme with a start date and a realistic finish, and updates when something moves.
The communication. One point of contact who knows your project, not a different number every week.
How it works
From first phone call to handover
First conversation
Tell us what you're thinking of doing. We'll be straight with you about whether it's realistic for the property and the budget you have in mind.
Free site visit
We come and look at the house — access, ground conditions, the existing structure, drainage, where the work actually has to happen. This is where most surprises get found.
Design, planning and drawings
Where drawings are needed we coordinate the architect and structural engineer, and handle the planning or permitted development route and the Building Regulations application.
Written quotation
An itemised quotation setting out the scope of works, what's included, what isn't, and the payment stages. You get it in writing before you commit to anything.
Contract and start date
A written contract, a staged payment schedule and a programme with a realistic start and finish date.
The build
One point of contact throughout. Regular updates, trades coordinated, the site left tidy at the end of each day.
Handover
Sign-off with Building Control where applicable, certificates handed over, snagging done, and your workmanship guarantee in writing.
Planning and Building Regulations
We handle the paperwork, not just the brickwork
Plenty of homeowners stall at this stage — permitted development, planning applications, Building Regulations, party wall notices, structural calculations. It's the part of a project that feels opaque from the outside.
We'll tell you which route your project needs at the site visit, coordinate the architect and structural engineer where drawings and calculations are required, and deal with Building Control through to sign-off.
Herefordshire, Monmouthshire and Gloucestershire both have a lot of conservation area and listed building stock, and parts of the Wye Valley sit within a designated landscape. That changes what's possible — it's worth knowing early, not after you've paid for drawings.
Where we work
Three counties, covered properly
We're set up to cover these three counties properly rather than spreading thin across half the country. If you're outside these areas, ask anyway — we'll tell you honestly whether it's practical.
- Hereford
- Leominster
- Ross-on-Wye
- Ledbury
- Bromyard
- Kington
- Monmouth
- Abergavenny
- Chepstow
- Usk
- Raglan
- Caldicot
- Gloucester
- Newent
- Coleford
- Cinderford
- Lydney
Common questions
Questions homeowners ask before they commit
How much does a house extension cost in Herefordshire?
It depends on size, ground conditions, the finish you want and how much structural work is involved — anyone quoting a figure without seeing the property is guessing. As a rough guide, single-storey extensions in this part of the country typically start around £2,000–£2,800 per square metre for a standard specification, before kitchens, bathrooms and landscaping. We give you an itemised written quotation after a free site visit. More on extension costs.
Do I need planning permission?
Many single-storey rear extensions and loft conversions fall under permitted development, but Herefordshire, Monmouthshire and Gloucestershire both have conservation areas, listed buildings and AONB land where the rules are tighter. We'll tell you which route your project needs and handle the application. Read the planning guide.
Can I live in the house while the work is done?
For most single-storey extensions and loft conversions, yes. There will be noisy weeks, and there may be a period without a kitchen or a bathroom depending on the job. We'll tell you honestly at the site visit what the disruption looks like and plan the sequence around it.
How do I know my money is protected?
By what's in writing before anything starts: an itemised quotation setting out exactly what is and isn't included, a written contract, and staged payments tied to completed stages of work — so you never pay for work that hasn't been done. The work is fully insured, including public liability, and the workmanship guarantee is given in writing at handover. We're happy to talk any of it through before you commit to anything.
What areas do you cover?
Herefordshire, Monmouthshire and Gloucestershire — Hereford, Leominster, Ross-on-Wye, Ledbury, Bromyard, Monmouth, Abergavenny, Chepstow, Usk, Raglan and the villages around them. See areas we cover.
Where we work
Herefordshire, Monmouthshire & Gloucestershire
From Leominster down to Chepstow and across to Gloucester — a defined patch either side of the border, so we know the property types, the ground and the planning departments in the places we build.
Call 01432 291045 (Hereford) · 01600 228805 (Monmouth)
Tell us what you're planning
A free site visit, an honest view on whether it's achievable, and a written quotation if you want to take it further. No pressure and no charge.
Prefer to talk it through first? Call 01432 291045 (Hereford) · 01600 228805 (Monmouth), or message us on WhatsApp.