RAPTOR ROOFING & CONSTRUCTION LTD

Extend Your Home Quality House Extensions in Cockfosters

Feeling short of space in Cockfosters? We design and build practical extensions that sit naturally with the existing house rather than feeling like an add‑on. We coordinate brickwork, roofing and structural carpentry so new roofs, walls and drainage tie into what’s already there. Arrange a site visit and we’ll provide a clear written proposal showing the scope and the next steps.

DISCUSS YOUR PROJECT EXPLORE SERVICES
House Extensions in CockfostersHERTFORDSHIRE / ESSEX / LONDON

AN INTRODUCTION / 06

Practical House Extensions Designed Around You

Want more space without moving? Describe the room you need and how you intend to use it — that shapes size, orientation and which trades will be involved.

Planning a kitchen extension, extra bedroom or a larger family living area? Our focus is on how the new space will perform: weatherproofing where a new roof meets the old, correct brick ties and drainage, and the timber work that supports floors and joists. We work with your architect or structural engineer when needed and will set out which regulated trades you should appoint so the project meets building control. Begin with clear priorities for space, natural light and access so the initial quote targets what matters.

EXPLORE THE OPTIONS

OUR SERVICES / 06

Our Extension Services

Choosing between extension types depends on plot constraints, neighbour boundaries and how much extra floor space you need. We perform the brickwork, roofing tie‑ins and structural carpentry those builds demand, and we coordinate with other contractors for regulated services. The common extension types each bring different implications for your property and access.

01 / 05HOUSE EXTENSIONS

Single-Storey Extensions

Single-storey extensions give ground-floor space for living, dining or enlarged kitchens. We check foundation options, connect new roof runs to existing tiles or membranes, and rework gutters and downpipes so rainwater is carried away correctly. Access and deliveries influence construction methods, so we plan logistics, temporary protection and joinery such as new lintels or external doors to make the finished room feel integral to the home.

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02 / 05HOUSE EXTENSIONS

Double-Storey Extensions

Double-storey extensions create substantial extra accommodation but demand careful structural design and roof integration. We work from your structural drawings to build walls, insert steel or timber supports where required, and tie new upper floors into existing roof geometry while maintaining weatherproofing. Neighbour impact, foundations and party‑wall matters often require early coordination with engineers and the homeowner’s appointed advisers.

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03 / 05HOUSE EXTENSIONS

Rear Extensions

Rear extensions expand the back of your house to create open-plan kitchens, family rooms or additional bedrooms. We prepare foundations to suit site conditions, build external walls that match or complement existing brickwork, and install roof connections with correctly detailed flashings and drainage. Deliveries, garden access and underground services are checked beforehand so the build proceeds without surprise obstructions.

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04 / 05HOUSE EXTENSIONS

Side Extensions

Side extensions increase lateral living space where the plot allows. We pay particular attention to boundary proximity, scaffolding and material access, and the effects on natural light to neighbouring rooms. Works can include new external doors or garage conversions, plus any needed rerouting of above‑ or below‑ground drainage so the new footprint functions with existing services.

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05 / 05HOUSE EXTENSIONS

Wraparound Extensions

Wraparound extensions combine rear and side work to create larger, flowing ground-floor spaces. These projects require detailed structural thinking, careful roofline design and a logistics plan for materials and waste. We coordinate the masonry, roofing and carpentry trades to ensure ties between new and existing elements are weatherproof and structurally sound, and we highlight when specialist drawings or party‑wall agreements are likely to be necessary.

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OUR PROCESS / FOUR STAGES

How We Approach Your Extension

To move from idea to handover without unnecessary surprises, we start with a practical assessment of access, boundaries and the intended use of the new rooms. From there we list who will carry out each stage and what drawings, surveys or approvals are required before work starts; timings and start dates are confirmed in writing after the survey.

  1. STAGE / 0101 — 04
    01

    Initial Consultation and Assessment

    Start by telling us how you want to use the space, the key dimensions and any known site restrictions. We discuss access, boundaries and the likely structural considerations and then decide whether a survey or measured drawings are needed to create a reliable proposal.

  2. STAGE / 0202 — 04
    02

    Design and Planning Support

    After the site assessment we’ll identify the drawings and statutory approvals likely required and advise whether planning permission or building‑regulation approval applies. We can work with your architect or structural engineer to prepare or review the technical information they need, and clarify which construction details affect thermal performance, drainage and structure. We’ll set out clearly which elements we will supply and install (for example roofing, flashing, gutters and related carpentry) and which items or trades you or your design team must arrange.

  3. STAGE / 0303 — 04
    03

    Construction and Build

    During construction we manage the masonry, carpentry and roofing tasks that form the main structure and roof tie‑ins. We schedule deliveries, protect existing areas of the house, and coordinate with any specialist contractors you’ve appointed so each phase completes to the agreed scope before the next begins.

  4. STAGE / 0404 — 04
    04

    Final Inspection and Handover

    At completion we walk through the finished work with you, check that external water runs and flashings are functioning, and confirm which maintenance items you should plan for. Where building control inspections are involved we ensure the paperwork is ready to hand over to you and your inspector.

WHY CHOOSE RAPTOR / WHAT MATTERS

Why Choose Us for Your Extension

Choosing a contractor who handles brickwork, roof integration and structural carpentry cuts down on site complexity. We set out which elements we carry out and how we coordinate other regulated trades so responsibility for each part is clear.

01

Simplified Trade Coordination

When roofing, brickwork and carpentry are delivered by the same team, the risk of misaligned connections between walls and roofs drops. We sequence the trades so roof tie‑ins, wall cavities and structural timber are planned together, reducing on‑site clashes and helping the build follow the design intent.

02

Clear Responsibilities

Prefer a single point of contact for the main structural and external trades? We take responsibility for the masonry, roof connections and timber work we agree to carry out and manage how those elements link into the existing building. Where regulated services are required, we highlight them so you can appoint the right specialists and keep coordination straightforward.

03

Practical Build Solutions

When a design encounters site limits such as tight access or awkward boundaries, we propose practical build methods and material choices to keep the project deliverable. That might mean revised delivery plans, temporary protection for existing rooms, or alternative foundation details that suit the soil and neighbouring ground conditions.

INSIGHT / House Extension Insights

Making Informed Decisions Choosing the Best Extension Type

Weighing single‑storey, double‑storey or wraparound options? Consider how you will use the extra space, what you can afford to lose from the garden and how disruptive the build will be for your household — clear priorities speed up design and budgeting.

01 / EXPLAINED

Understanding Single-Storey Extensions

Single‑storey extensions are often the least complex way to add practical living area, particularly for enlarging kitchens or creating a new family room on the ground floor. Start by defining the room’s intended function and whether you need bi‑fold doors, a utility area or a separate dining zone; small changes in layout affect structural and drainage decisions. Foundations must suit the ground conditions and proximity to trees or drains; sometimes a lightweight pad foundation is enough, but other sites need more substantial footings, which a ground survey will reveal. Roofing ties are critical: ensure the valley, flashing and gutter details are specified to avoid future leaks. When choosing finishes, consider how closely you want the extension to match existing brickwork and tiles — matching materials help the extension blend in but can add costs or lead times if matching bricks are old or discontinued. We produce a written scope that lists what we will carry out and what you should expect other contractors to deliver, which makes tendering for regulated trades easier and keeps responsibility clear on site.

02 / EXPLAINED

Complexities of Double-Storey Extensions

Adding a second storey substantially changes loads through the house, so structural assessment is non‑negotiable. A structural engineer will check whether existing foundations and load‑bearing walls can support the extra weight or if underpinning or new footings are necessary. Upstairs layout decisions also affect stair location, head height and the roofline above — every alteration to the roof requires thoughtful flashing, insulation and ventilation detailing. Neighbour considerations such as overlooking and daylight impact often make planning submissions necessary; an early chat with the planning authority or your architect avoids late redesigns. Building control focuses on structure, fire safety and thermal efficiency, so you’ll need drawings that show compliance. Coordination between trades becomes more important as more installers will be on site: we sequence masonry, carpentry and roofing phases to keep the shell we build weatherproof while internal specialists complete services. Clear, staged payment and milestone arrangements reduce the likelihood of disputes during the more complex phases of a two‑storey project.

03 / EXPLAINED

Navigating Site Constraints and Regulations

Site realities — narrow side access, boundary walls, driveways and underground services — often dictate design choices as much as your wish list does. If access is limited, we plan smaller deliveries, temporary storage and careful scaffold placement so work proceeds safely. Check underground utilities before foundations start to avoid costly rework. Permitted development rights can allow some single‑storey extensions without full planning, but the rules include limits on height, depth and proximity to boundaries; if your project exceeds those limits, a planning application will be required. Party‑wall agreements may be necessary when new foundations or walls are close to a neighbour’s property; early engagement with adjacent owners and issuing party‑wall notices can prevent delays. For drainage, ensure new downpipes connect into existing drains or a new soakaway is designed by a drainage specialist. We outline the practical approvals and surveys likely to affect your project so you can plan budgets and timelines with fewer surprises.

AREAS WE SERVE

Areas We Cover

We carry out house extensions in Cockfosters and the surrounding area of North London. We also cover nearby towns such as Barnet, Southgate and Potters Bar. If you are outside these areas, contact us and we will check whether your location fits our coverage before preparing a proposal.

DISCUSS YOUR LOCATION
01 / COUNTYHertfordshire
02 / COUNTYEssex
03 / REGIONLondon

START THE CONVERSATION

Tell us about the job and we will take a look

Send us a few photographs and your postcode using the form, or give us a call. We will come back to you, arrange a survey where one is needed, and set out in writing what we recommend and why before any work is agreed.

07803 569220 info@raptor-roofing.co.uk
EXTENSIONS / ENQUIRY DETAILS01 — 05

Tell us about your project.

Send your project details to Raptor using the form below.

Your enquiry will be sent securely through this website.

QUESTIONS / HOUSE EXTENSIONS

Common Questions About Extensions

Preparing to enquire? Gather site photos, an outline budget and how you expect to use the new rooms. Practical answers follow on permissions, access and who does what on site, plus the information you should bring to a survey.

ASK ANOTHER QUESTION
01Do I always need planning permission for a house extension in Cockfosters?

Not always. Certain single‑storey extensions may fall under permitted development but they must meet size, height and boundary rules. Larger works, two‑storey additions or projects visible from the street are more likely to need planning permission. We advise you on this after seeing the proposed footprint and can suggest whether a planning application is likely.

02Can you manage the whole extension project for me?

We carry out the core construction trades we’ve agreed to — masonry, roofing and structural carpentry — and coordinate with the regulated specialists you appoint for gas, mains electrical or specialist drainage. If you want us to recommend or liaise with designers and engineers we can do that, but be clear in the proposal which parties are responsible for specific regulated works.

03What information should I prepare for an accurate quote?

Photographs of the existing elevations, rough measurements, a description of the new rooms’ intended use and any known access issues help us prepare a targeted quote. If you have architect sketches or a planning history, include those. We will advise whether further surveys or measured drawings are required to finalise prices.

04Will an extension affect existing gutters and drainage?

Yes — adding roofs or changing runoffs alters where rainwater discharges. We plan guttering, fascias and downpipes so new and existing roofs work together, and check how new outlets connect to your drains. Where necessary we recommend drainage design changes and coordinate with your appointed specialist to ensure compliance.

05How do access limitations affect the build?

Narrow side passages, gates or small rear gardens affect how materials and scaffold arrive on site. We plan deliveries, temporary storage and working hours to suit your layout. In constrained sites we sometimes use smaller delivery vehicles or staged material delivery to avoid blocking neighbouring access.

06What should I expect after requesting a site visit?

Expect a focused visit to verify access, boundaries and basic ground conditions, and to record photos and measurements. After that we will advise whether further surveys or drawings are needed and provide a written proposal that sets out the scope we will carry out and which regulated trades you should arrange separately.