Our Expertise

What We Do

From bespoke new builds to sensitive heritage restorations, we deliver construction of uncompromising quality — managed from first consultation to final handover.

£350k

Bespoke New Builds

From contemporary country houses to elegant urban residences, we build homes of enduring quality. Working alongside your architect or our trusted design partners, every new build is managed from foundation to finishing coat — with the structural integrity, thermal performance and craftsmanship that define a home built to last generations.

Architect-led designEPC A achievableNHBC warranty10-year structural guarantee
  • Bespoke residential homes from initial concept
  • Architect collaboration and design coordination
  • Foundation engineering and groundworks
  • Full structural build with premium materials
  • Mechanical, electrical and smart-home installations
  • Landscaping, driveways and external works
Example of bespoke new builds by Hartwell & Stone

Typical Process

01 Feasibility & site appraisal 02 Design development with your architect 03 Planning & Building Regulations 04 Groundworks & foundations 05 Superstructure & envelope 06 First & second fix 07 Commissioning & handover
£60k

Extensions & Additions

From single-storey kitchen extensions with full-width bi-fold doors to substantial double-storey additions that transform your home's footprint, every project is designed to feel like a natural continuation of the original architecture. We handle structural engineering, party wall agreements, planning applications and building control — so you deal with one team from concept to completion.

Architect coordinationParty wall managementMatched materials10-year guarantee
  • Single, double and wrap-around extensions
  • Rear, side and over-garage additions
  • Structural steelwork and RSJ installation
  • Bi-fold, sliding and pivot door systems
  • Full planning and building control management
  • Interior finishing to architectural specification
Example of extensions & additions by Hartwell & Stone

Typical Process

01 Initial site survey 02 Design & planning submission 03 Party wall agreements 04 Groundworks & foundations 05 Structural build 06 Roofing & weatherproofing 07 Internal fit-out & finishing
£80k

Listed Buildings & Heritage

Working with listed buildings, conservation areas and historic structures demands a particular reverence for the original craftsmen's work. Our heritage team brings specialist knowledge of lime mortars, traditional joinery, heritage glazing and conservation-grade materials — always in close consultation with conservation officers and Historic England where required.

Conservation officer liaisonTraditional materialsHeritage joinerySPAB principles
  • Grade I, II and II* listed building works
  • Conservation area permissions and liaison
  • Lime plaster, render and pointing
  • Sash window restoration and draught-proofing
  • Structural repair and underpinning
  • Heritage-sensitive modern upgrades
Example of listed buildings & heritage by Hartwell & Stone

Typical Process

01 Heritage assessment & measured survey 02 Conservation officer pre-application 03 Listed building consent 04 Specialist procurement 05 Phased conservation works 06 Modern services integration 07 Completion & heritage record
£120k

Whole-House Renovations

Whether you've acquired a period property in need of sympathetic restoration or a tired 1960s house crying out for a complete reimagining, our renovation team manages every trade under one roof — structural alterations, rewiring, replumbing, plastering, joinery, decoration and landscaping. One team, one programme, one point of contact.

Single point of contactAll trades in-houseFixed-price available10-year guarantee
  • Complete interior strip-out and refurbishment
  • Structural remodelling and load-bearing alterations
  • Full mechanical and electrical rewire
  • Period feature restoration
  • Kitchen, bathroom and utility installations
  • Decoration, flooring and finishing throughout
Example of whole-house renovations by Hartwell & Stone

Typical Process

01 Detailed property survey 02 Scope of works & specification 03 Planning (if required) 04 Strip-out & structural works 05 First fix services 06 Plastering & second fix 07 Decoration & final fit-out
£250k

Heritage & Barn Conversions

We transform barns, chapels, warehouses, maltings and other characterful buildings into exceptional homes. Each conversion begins with a thorough structural and heritage assessment, followed by a design that celebrates the building's original character while delivering the thermal performance, layout and finish of a contemporary home.

Heritage expertiseEcological surveysTraditional craftsmanshipConservation compliance
  • Barn, chapel, warehouse and mill conversions
  • Structural surveys and feasibility assessments
  • Change-of-use and Class Q planning
  • Timber frame repair and restoration
  • Heritage-sensitive insulation solutions
  • Contemporary interiors within historic shells
Example of heritage & barn conversions by Hartwell & Stone

Typical Process

01 Building appraisal & surveys 02 Planning & Listed Building Consent 03 Structural stabilisation 04 Envelope & weatherproofing 05 Services installation 06 Internal fit-out 07 Landscaping & external works
From 12%

Project Management

For clients who already have their design team and specialist contractors in place, we offer dedicated project management — coordinating every trade, managing the programme, controlling costs and ensuring quality standards are met at every stage. Your single point of accountability from planning through to practical completion.

Dedicated project managerWeekly client reportsCost transparencyDefects period management
  • Full programme management and scheduling
  • Cost control and monthly reporting
  • Contractor procurement and coordination
  • Quality assurance and site inspections
  • Client liaison and progress updates
  • Practical completion and defects management
Example of project management by Hartwell & Stone

Typical Process

01 Brief & scope review 02 Programme development 03 Contractor appointment 04 Construction oversight 05 Quality inspections 06 Practical completion 07 Defects period & final account
Our Promise

Price Lock Guarantee

We lock your project price at design stage. No hidden costs. No surprises. Just honest, transparent pricing from day one.

Fixed Price

Your price is locked at design sign-off — we absorb cost increases, not you.

No-Change Clause

Agreed scope means agreed price. Only client-requested changes affect the final cost.

Full Transparency

Itemised quotations, open-book accounting, and a clear variation process if you change your mind.

FAQ

Common Questions

What is your typical project value range?

Our projects typically range from £60,000 for a well-specified extension to over £2M for bespoke new builds and heritage conversions. We focus on quality-driven projects where craftsmanship and attention to detail are priorities. If your project is below £60,000, we're happy to recommend trusted colleagues who may be a better fit.

Do I need planning permission for my project?

It depends on the scope. Many rear extensions fall under permitted development rights, while new builds, heritage works and conversions almost always require planning. We manage the entire planning process — from pre-application advice through to discharge of conditions — and have a strong track record of approvals across Essex and the South East.

How do you manage costs and prevent overruns?

Transparency is central to how we work. Every project begins with a detailed specification and fixed-price quotation. We use a milestone-based payment schedule, provide monthly cost reports and flag any potential variations before they become commitments. Over the past five years, 94% of our projects have completed within 3% of the original quotation.

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Let's Discuss Your Vision

Every exceptional home begins with a conversation. Book a complimentary consultation — we'll visit your site, listen to your aspirations and provide honest, expert guidance with no obligation.

Call 01245 267 891 Start a Conversation