Practical construction and regulated refurbishment support across London.
From loft conversions and extensions to leasehold flat refurbishment, mansion block refurbishment, small HRB works, Gateway 2 support, Gateway 3 support and maintenance - everything managed under one accountable plan, inside the M25.
Everything we do - at a glance.
Click any service to jump to the full detail below.
Loft Conversions
Dormer, hip-to-gable, mansard and room-in-roof conversions across London.
Full details →Extensions
Single and double-storey rear and side extensions with full structural coordination.
Full details →Full Renovations
Strip-out to handover. Every trade, coordinated under one project plan.
Full details →Refurbishments & Fit-Outs
Residential and commercial refurbishments with bespoke joinery and high-spec finishes.
Full details →Drylining & Plastering
Specialist drylining, insulation, tape and jointing for residential and commercial projects.
Full details →QS & Estimating
Quantity surveying, take-offs, tender pricing and cost planning for contractors and developers.
Full details →Small HRB Works & Gateway Support
Gateway 2 and Gateway 3 support for smaller regulated refurbishment works in London flats, mansion blocks and residential blocks.
Full details →Maintenance & Reactive Works
Leaks, repairs, small works and ongoing property maintenance for homeowners and landlords.
Full details →Back Office Support for Construction Firms
Commercial and administrative support for contractors, subcontractors and construction firms that need reliable help behind the site team.
Full details →Pre-Purchase Renovation Cost Plan
Considering a property that needs work? Get a contractor-led renovation cost plan before you commit to the purchase.
Full details →Loft Conversions
A loft conversion is one of the most effective ways to add living space and increase property value without moving. Bayocorp manages the full process - from planning and structural work through to insulation, staircases and final fit-out.
We've completed loft conversions across North London, Islington, Camden, Hackney, Haringey and beyond. Every project is planned in detail before a single tool hits the roof.
- Dormer, hip-to-gable, mansard and Velux conversions
- Planning permission and permitted development guidance
- Structural design, steel beams, party wall coordination
- Insulation, boarding, staircase installation
- En-suite bathrooms, bedroom, office or living space
- Full M&E integration and building control sign-off
- Typical project value: £40,000–£120,000+
Extensions
Single and double-storey rear and side extensions, designed and delivered with full structural coordination, building control sign-off and seamless integration with the existing property.
Bayocorp manages architects, structural engineers and building control alongside our trade teams - so you have one point of contact, not five.
- Single-storey and double-storey rear extensions
- Side return extensions and wrap-around extensions
- Garage conversions and outbuilding extensions
- Structural groundworks, foundations and steelwork
- Roofing, glazing, underfloor heating, bi-folds
- Open-plan kitchen-diner layouts and interior integration
- Party wall agreements and planning coordination
Full Renovations
Complete strip-out to handover. Whether it's a single flat or a four-storey family home, Bayocorp coordinates every element - structural, M&E, finishing trades and project oversight - as one managed project.
Our track record includes a £235,000 Fulham four-storey refurbishment, a G→C EPC improvement in Archway, and a COVID-period delivery in Shoreditch - all on time and to specification.
- Full property strip-out and structural alterations
- Internal reconfigurations and layout changes
- Kitchen and bathroom design and installation
- Electrical rewiring, lighting design, smart home
- Heating systems, underfloor heating, boiler replacement
- Flooring, plastering, tiling, decorating
- Bespoke joinery, fitted wardrobes, media walls
- EPC improvement works
Refurbishments & Fit-Outs
Residential and commercial refurbishments with bespoke joinery, high-spec finishes and interior reconfigurations. Whether you need a single room refreshed or an entire floor transformed, Bayocorp applies the same structured delivery approach.
- Residential flat and house refurbishments
- Commercial office and retail fit-outs
- Bathroom and kitchen refurbishments
- Bespoke fitted furniture and joinery
- Internal decorating, flooring and tiling
- Landlord property upgrades and void works
- HMO conversions and rental property refurbishments
Drylining & Plastering
Bayocorp is a specialist drylining contractor. We've delivered drylining packages across residential and commercial new-build and refurbishment projects - including a full nine-plot development in West Sussex for Future Designer Homes.
We also provide drylining as a standalone package for main contractors and developers who need a reliable, quality-focused subcontractor.
- Metal stud and timber frame partitioning
- Acoustic and thermal insulation
- Plasterboard fixing and taping and jointing
- Skim plaster and finish plaster
- Suspended ceilings and bulkheads
- Specialist drylining for new-build developments
- Blue grit and bonding coat applications
QS & Estimating Consultancy
Bayocorp acts as an external QS and estimating department for contractors and developers across London. Our QS background is what separates us from most refurbishment companies - accurate costing, not guesswork.
We specialise in drylining take-offs and estimating, but cover all trades across residential and commercial projects.
- Quantity take-offs and area schedules
- Tender pricing and bid preparation
- Cost plans and budget estimates
- JCT and NEC contract support
- Pre-purchase site appraisals
- Specialist drylining estimating
- Back-office support for construction firms
Maintenance & Reactive Works
For homeowners and landlords who need reliable, responsive property maintenance - Bayocorp provides a trusted ongoing service. From emergency repairs to routine upkeep, we respond fast and fix it properly.
- Leaks, plumbing issues and drainage
- Electrical faults and consumer unit work
- Plastering repairs and patching
- Door, window and lock repairs
- Roof repairs and emergency weatherproofing
- Landlord compliance and letting certification
- General property upkeep and small works
Back Office Support for Construction Firms
Bayocorp provides construction back-office support for firms that need reliable commercial and administrative help without adding a full in-house team.
This service gives construction firms structured support across tender preparation, estimating, documentation, cost tracking, project paperwork and day-to-day construction admin.
We act as a commercial and administrative support partner for contractors, subcontractors, developers and specialist trades that need stronger systems behind their site delivery.
- Construction back-office support for contractors, subcontractors and specialist trades
- Tender preparation, pricing and submission support
- Estimating, take-offs, cost planning and commercial review
- Cost tracking, variations, project paperwork and document control
- Pre-purchase, pre-start and live project appraisals
- Administrative support for live projects, enquiries and client communication
Gateway 2 and Gateway 3 Support for Smaller HRB Works in London
Many Building Safety Regulator and Higher-Risk Building services are aimed at large developments, tower blocks and multi-million-pound construction projects. However, many London property owners, leaseholders, landlords and managing agents also need support with smaller regulated works inside existing mansion blocks, converted buildings and residential blocks that may fall within HRB requirements.
Bayocorp supports regulated refurbishment and conversion works in London buildings where Gateway 2, Gateway 3, building control, compliance evidence and certified trade input may be required.
We help coordinate the practical side of regulated building work, including scope review, contractor input, project planning, compliance evidence, technical documentation, change control support, construction control plan input, and handover information for completion.
Our focus is on giving clients clear, practical support for smaller HRB and regulated refurbishment projects - not just large-scale high-rise developments.
- Higher-Risk Building contractor London support for small works in Higher-Risk Buildings
- BSR Gateway 2 support and Gateway 2 readiness for building control approval before works start
- BSR Gateway 3 support, completion support, O&M manuals, handover pack and completion evidence
- Flat refurbishment in HRBs, top-floor flat refurbishment and leasehold flat refurbishment support
- London mansion block refurbishment, converted buildings and residential block refurbishment coordination
- Building Regulations compliance support, fire compartmentation awareness and compliance evidence
- Change control, technical documentation, inspection records and programme management
Certified trade coordination where required.
Bayo Corp can coordinate works with suitably qualified and registered trades where required, including Gas Safe registered engineers, NICEIC or NAPIT registered electricians, FENSA or Certass approved window and door installers, HETAS approved fireplace and solid fuel specialists, and other competent person scheme providers.
This means clients can get practical London flat refurbishment compliance support without being pushed into a large corporate consultancy model.
Smaller HRB works, Gateway 2 and Gateway 3 questions.
Practical answers for leaseholders, landlords, managing agents, buyers, architects and property professionals planning regulated refurbishment works in London.
Do you only work on large HRB projects?
No. Bayo Corp focuses on practical refurbishment and regulated building work support, including smaller projects in London flats, mansion blocks and residential blocks where HRB or Building Safety Regulator requirements may apply.
Can you help with Gateway 2 and Gateway 3?
Yes. Bayo Corp can support the preparation, coordination and practical delivery of information needed for Gateway 2 and Gateway 3 processes, working alongside the client's design team, consultants, building control professionals and registered specialists where required.
Can you support works in older mansion blocks?
Yes. Many London mansion blocks and older residential buildings require careful planning, access coordination, fire safety awareness, neighbour consideration, building control input and certified trade involvement. Bayo Corp can help manage these requirements for mansion block refurbishment contractor support and leasehold refurbishment contractor London projects.
Do you use certified trades?
Where required, Bayo Corp can coordinate with suitably registered and approved specialists, including a Gas Safe registered engineer, NICEIC certified electrician, NAPIT registered electrician, FENSA approved installer, Certass approved installer, HETAS approved installer and other competent person scheme providers.
A contractor-led renovation cost assessment before you commit.
For buyers, homeowners and investors who want to understand the likely cost of improving, refurbishing or renovating a property before committing to a purchase or project.
This service is designed to help you understand the likely scope, specification and cost of renovating a property - ideal if you want a clearer idea of what it may cost to bring a property up to your desired standard before making a final decision.
Important: this is not a certified condition report, building survey, structural survey or mortgage valuation. We do not provide formal certified survey reports. This is a renovation-focused cost plan, prepared from a contractor's perspective, based on our experience delivering refurbishment and renovation projects.
What you provide before the visit
- A floor plan
- Photos or listing details of the property
- Images or examples of finishes and styles you like
- A brief description of what you want to achieve
- The property location
Once we have this information, we'll confirm whether we can arrange a site visit - subject to the property being within our service area.
What's included in the report
- Outline scope of works
- Itemised renovation requirements
- Suggested works based on the desired finish
- Outline pricing
- Practical contractor-led comments
- Key considerations before moving forward
- Potential budget allowances
- Notes on areas that may require further specialist input
Based on property size
Larger properties or those in poor condition may require a higher fee depending on complexity. We mainly work across London and the South East - get in touch with the property location and we'll confirm whether we can assist.
Need any of these services? Contact Bayocorp and we will guide the next step.
Loft conversions, extensions, full renovations, leasehold flat refurbishment, regulated refurbishment works, small HRB works, HRB/BSR Gateway support, drylining, QS support, maintenance, back-office support or a pre-purchase cost plan - send us the details and we will help you choose the right route.
Questions about the Pre-Purchase Renovation Cost Plan.
What makes you qualified to provide this service?
We've completed over 100 refurbishment and renovation projects over the last 28 years, across a wide range of property types, conditions and specifications. Our experience is both practical and commercial - we're regularly involved in pricing, planning and delivering renovation works, which gives us a strong understanding of what projects actually cost on the ground. We're constantly buying materials, working with suppliers, managing labour and pricing work for other businesses, which keeps us close to current market conditions, labour rates and material costs across London and the South East.
How can you provide a renovation cost plan?
We've delivered many renovation projects involving modern finishes, updated installations and full property improvements, giving us a strong understanding of what's usually required to bring a property up to a certain standard - common issues, costs, materials, labour and sequencing. With over 28 years in the building industry, both on site and commercially, plus direct experience in property purchasing and renovation ourselves, we're well placed to assess a property from a renovation perspective and provide an informed, itemised breakdown.
Is this the same as a building survey?
No. This is not a certified building survey, structural survey, condition report or mortgage valuation. A Pre-Purchase Renovation Cost Plan is focused specifically on renovation works - designed to help you understand the likely cost, scope and practical requirements of improving or refurbishing a property.
Who is this service for?
Potential property buyers, homeowners planning a renovation, landlords, property investors, and anyone considering a refurbishment before committing to a project. It's especially useful for buyers who want to understand whether a property is financially realistic to renovate before moving forward.
Do you cover my area?
We mainly work across London and the South East. Please get in touch with the property location and a brief outline of what you require, and we'll confirm whether we're able to assist. Coverage depends on the location of the property, the size of the project and the level of assessment required.
We work inside the M25 and across the South East.
Based in North London (Archway, N19), we regularly deliver projects across all London boroughs and into the surrounding counties.
Questions clients commonly ask.
What is the minimum project size you take on?
Our main construction projects typically start from around £30,000 for refurbishments, with most full renovations ranging from £60,000 to £250,000+. For QS consultancy, estimating and back-office services, we discuss scope and fee on a case-by-case basis. For small maintenance works, there is no fixed minimum - contact us to discuss.
Do you handle planning permission and building control?
Yes. We help clients understand what planning consent, permitted development, leasehold approval, Building Regulations compliance or Building Safety Regulator support may apply to their project, coordinate with architects and structural engineers, and manage the building control process through to final sign-off. We don't leave clients to figure this out themselves.
Do you work with homeowners, landlords or developers?
All three. We work with homeowners on residential renovations and extensions, with landlords on refurbishments and void works, and with developers on new-build packages and QS consultancy. The approach is the same regardless - detailed planning, clear communication, structured delivery.
How quickly can you start?
Start dates depend on the current pipeline and the size of your project. We'll give you a realistic mobilisation date as part of the scoping process. We'd rather be honest about lead times than overcommit and underdeliver.
What areas do you cover?
We're based in North London (N19) and cover all London boroughs and the surrounding South East counties - including Surrey, West Sussex, Kent, Essex and Hertfordshire. As a general rule: if you're inside or near the M25, we can help.
Are you insured and accredited?
Yes. Bayocorp holds £5m public liability and £10m employers liability, with the current Markel International employers liability certificate running from 16 July 2026 to 15 July 2027 under policy ACC00000464. Ade holds NVQ Level 7 in Construction Site Management, SMSTS, and is an FMB member. Where required, we coordinate with suitably registered specialists under competent person schemes. Full insurance details and certificates are available on request.
I don't know what my budget should be - can you help?
Yes - this is exactly what our Pre-Purchase Renovation Cost Plan is for. We'll visit the property, review it from a renovation perspective, and provide an itemised cost plan outlining what we believe is required to bring it up to your desired standard - including outline pricing and key considerations. This isn't a certified survey; it's a contractor-led view of the likely renovation cost.
How do I get a quote?
The quickest route is to send photos on WhatsApp (07700 17 70 10) along with a description of what you need. Alternatively, fill in the project details form on this site, call the office on 02039 10 00 01, or schedule a call. We aim to respond to all enquiries within 24 hours on working days.